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Author SHA1 Message Date
MattJackson a74d395f68 Audit v3 fixes: all 3 tiers (19 findings) 
Tier 1 (compilation + correctness):
- Fix nightly-only is_multiple_of → % 2 != 0 (stable Rust compat)
- Fix parse_sample_rate: check 192 before 96 (was returning wrong rate)
- macOS drive discovery: split unix.rs → linux.rs + macos.rs
- Linux: EACCES returns DevicePermission not DeviceNotFound
- CLI pipe.rs: Ctrl+C signal handler added

Tier 2 (correctness + security):
- MkvStream: reset demuxer after scanning→streaming transition
- Windows SPTI: zero data buffer before ioctl
- AACS cert verification: documented why silently skipped
- KEYDB: HOME + USERPROFILE fallback for Windows
- Library modules: pub(crate) for internal modules
- AACS: explicit re-exports, AES primitives pub(crate)

Tier 3 (performance + polish):
- IsoStream: batch 64-sector reads (was 1 sector at a time)
- DiscStream: buffer swap instead of copy in decrypt_and_buffer
- Vec capacity hints in TS/PS demuxer hot paths
- NetworkStream: TLS warning documented
- Batch rip: per-title progress display
- cargo fmt: 0 violations

319 tests, 0 fmt violations.
 2026-04-11 19:24:25 +00:00
MattJackson 43f81e4eae Fix audit v2 criticals: DiscStream read loop, CSS crack, ISO writer 
Critical fixes:
- DiscStream: persistent read state (was creating new ContentReader per call)
  Full error recovery, AACS/CSS decryption, extent tracking across reads
- CSS crack: labeled 'outer continue (was targeting wrong loop)
- CSS crack: LFSR0 polynomial fixed to match cipher (shifts 8,1,3,7)
- CSS lfsr: operator precedence clarified in LFSR0 init

Warning fixes:
- ISO writer: UDF tag checksums computed (was zeros)
- DVD extents: saturating_add for overflow safety
- Removed dead fields: HandshakeResult.error, ContentReader.content_format
- Added TODO for ISO long_ad >4GB support

319 tests, 20 clippy warnings remaining.
 2026-04-11 19:11:25 +00:00
MattJackson d56dd934bb cargo fmt + clippy --fix: 104 format violations fixed, 8 clippy auto-fixes 2026-04-11 19:10:20 +00:00
MattJackson c91d6e371f Chapters, DVD subtitle palette, MKV track flags, progress total_bytes 
Chapters:
- MPLS PlayList marks parsed (mark_type 1 = chapter)
- Chapter struct on DiscTitle (time_secs, name)
- MKV Chapters element with EditionEntry/ChapterAtom per mark
- 3 MPLS mark tests + 2 MKV chapter tests

DVD subtitle palette:
- IFO palette extraction (PGC offset 0xA4, 16 × YCbCr colors)
- YCbCr→RGB conversion for VobSub .idx format
- DvdSubParser codec_private returns formatted palette
- codec_data field on SubtitleStream flows through pipeline
- 5 palette tests (YCbCr conversion, formatting, overflow)

MKV track flags:
- FlagDefault: primary video/audio = 1, secondary = 0
- FlagForced: forced subtitles = 1
- Language: set from stream language code
- Already implemented, verified with 4 new tests

Progress total_bytes:
- IOStream trait: total_bytes() -> Option<u64>
- DiscStream, IsoStream: from disc_title.size_bytes
- M2tsStream, MkvStream: from file metadata on open
- NetworkStream, StdioStream, NullStream: None

316 tests total, all passing.
 2026-04-11 17:43:47 +00:00
MattJackson 9cb0c369e4 Add MKV muxer, IsoWriter, disc pipeline, and network tests 
- MKV muxer: EBML header, segment, cluster, cues, multi-track, keyframe flags — 6 tests
- MkvStream: BD-TS roundtrip, metadata preservation — 2 tests
- IsoWriter: valid UDF, file size update, custom names, empty content — 4 tests
- Disc pipeline: format detection (UHD/BD/DVD), content format, capacity, duration — 5 tests
- Network: listen/connect roundtrip, metadata flow — 2 tests (ignored for CI)
- Encryption: no AACS dir, no keydb — 2 tests
- 297 tests total, all passing
 2026-04-11 17:27:36 +00:00
MattJackson 63accb6718 100% codec coverage + disc/ and aacs/ module refactors 
Codec coverage (DVD + BD + UHD):
- E-AC-3 (Dolby Digital Plus): bsid detection, frame size calc — 8 tests
- DTS-HD MA/HR: extension substream (0x64582025) detection — 8 tests
- LPCM: BD header skip, raw PCM extraction — 6 tests
- DVD VobSub subtitles: passthrough parser — 5 tests
- Dolby Vision: verified RPU NAL type 62 preserved in HEVC — 1 test

Module refactors:
- disc.rs → disc/mod.rs + bluray.rs + dvd.rs + encrypt.rs
- aacs/mod.rs (1661 lines) → mod.rs (21) + keydb.rs + keys.rs + decrypt.rs
- All public APIs preserved, all tests pass

270 tests total, 0 failures.
 2026-04-11 17:22:18 +00:00
MattJackson 187255106f Add crypto roundtrip tests: CSS + AACS validation 
- CSS: decrypt_key determinism, descramble XOR roundtrip, TAB1 permutation,
  TAB4 bit-reversal involution, Stevenson attack on scrambled sector
- AACS: decrypt_unit roundtrip, disc hash deterministic, VUK derivation,
  unit key parsing, EC point-on-curve and ECDSA already covered
- 239 tests total
 2026-04-11 17:17:29 +00:00
MattJackson fd4c88e969 CSS crypto tests + DVD pipeline fully wired 
- CSS roundtrip tests: decrypt_key determinism, descramble XOR roundtrip
- CSS table verification: TAB1 is permutation, TAB4 is bit-reversal involution
- DVD scan pipeline confirmed: scan_dvd_titles, CSS crack, ContentReader descramble
- 229 tests, all passing
 2026-04-11 17:14:58 +00:00
MattJackson 59e6916702 Rewrite CSS from Stevenson 1999 paper — proper table-driven cipher 
- tables.rs: 5 CSS specification tables (TAB1-TAB5, mathematical constants)
- lfsr.rs: Table-driven LFSR1 (TAB2/TAB3) + LFSR0 (TAB4), sector seed XOR,
  decrypt_key() mangling function, descramble_sector() with proper feedback
- crack.rs: Stevenson divide-and-conquer attack (2^16 LFSR1 iteration,
  LFSR0 deduction from known plaintext, 10-byte validation)
- No external code copied — original Rust implementation from the 1999 paper
- 225 tests, 0 ignored
 2026-04-11 17:07:21 +00:00
MattJackson 01235ff347 Audit fixes + DVD support foundation (IFO, PS demux, MPEG-2, CSS crack) 
Audit fixes (14 critical, 22 warnings):
- UDF: bounds checks on all ICB/FID parsing from disc data
- SCSI Linux: saturating_sub on residual, CDB length guard, buffer size guard
- SCSI macOS: SCSITaskStatus u32 (was u8 — stack corruption)
- AACS: EC mod_inv returns infinity instead of panic, key reduced mod n
- AACS: do_handshake tries all host certs (was returning on first failure)
- H.264: bounds check on SPS < 4 bytes
- ContentReader: error on missing unit key (was zero-fill)
- KEYDB: flat redirect loop (was recursive), 100MB response limit, Windows HOME fallback
- ISO writer: AVDP extent order, partition length, allocation cap
- Network: removed TCP_NODELAY on bulk stream
- MKV: guard on u64::MAX seek
- disc.rs: saturating_sub on extent offset, simplified dead region code
- cargo fmt (610 violations), cargo clippy --fix (55 auto-fixes)

DVD support (new files):
- src/ifo.rs — IFO parser (VIDEO_TS.IFO, VTS_XX_0.IFO, PGC chains, cells, streams) — 13 tests
- src/mux/ps.rs — MPEG-2 Program Stream demuxer (pack headers, PES, private stream 1) — 12 tests
- src/mux/codec/mpeg2.rs — MPEG-2 video parser (sequence headers, I-frame detection) — 15 tests
- src/css/crack.rs — split-attack algorithm (LFSR cipher needs verification — test ignored)

226 tests total (was 186), 1 ignored (CSS crack needs cipher verification).
 2026-04-11 16:52:22 +00:00
MattJackson 6de4ee4b5c v0.7.2: Windows SPTI, 177 tests, platform file separation 2026-04-11 16:15:14 +00:00
MattJackson 425583ea09 Refactor: drive discovery into platform files, no inline cfg 
- drive/unix.rs: find_drives() + resolve_device() for Linux/macOS
- drive/windows.rs: find_drives() + resolve_device() + normalize_path() for Windows
- drive/mod.rs: clean delegation, no cfg branches
- scsi/windows.rs: SPTI transport only, no drive discovery
 2026-04-11 16:12:53 +00:00
MattJackson f67a8aa8d5 Add Windows SPTI backend, CI check, platform support complete 
- scsi/windows.rs: SCSI_PASS_THROUGH_DIRECT via DeviceIoControl
- Device path normalization (D:, \\.\CdRom0, \\.\D:)
- Windows drive discovery (CdRom0-15 + drive letters)
- CI: cargo check on windows-latest
- Platform table: Linux + macOS + Windows all supported
 2026-04-11 16:08:30 +00:00
MattJackson 059bce6331 Add 113 tests, update CI to checkout@v5, add FEATURES.md 
Test suite: 64 → 177 tests
- MPLS parser: 6 tests (synthetic binary, streams, errors)
- CLPI parser: 6 tests (EP map, PTS/SPN math, errors)
- H.264: 12 tests (NAL parsing, SPS/PPS, keyframes)
- HEVC: 13 tests (VPS/SPS/PPS, IRAP range, codec private)
- AC3: 12 tests (syncword, frame extraction)
- VC1: 15 tests (BITMAPINFOHEADER, start codes)
- DTS: 5, TrueHD: 4, PGS: 4 tests
- EBML: 6 tests (size/ID/string/float roundtrips)
- UDF: 10 tests (MockSectorReader, filesystem parsing, error paths)
- Disc: 8 tests (scan_image, DiscTitle helpers)
- Streams: 5 new (meta roundtrip, MkvStream)
- NullStream: 4, StdioStream: 2, IsoSectorReader: 2

CI: actions/checkout@v4 → v5 (all workflows)
FEATURES.md: created for v0.7.1
 2026-04-11 16:02:49 +00:00
MattJackson cb099531c9 v0.7.1: SectorReader trait, IsoStream, StdioStream, resolve_encryption 
- SectorReader trait decouples disc scanning from SCSI
- Disc::scan_image() for ISO and any sector source
- resolve_encryption() handles AACS 1.0/2.0/none in one path
- IsoStream: full UDF/MPLS/CLPI/labels pipeline from ISO files
- StdioStream: stdin/stdout pipe
- Strict scheme:// URL format with validation
- Labels module refactored to SectorReader
- 7 stream types total
 2026-04-11 15:49:29 +00:00
MattJackson c79d3ab530 Fix update-readme: use ORG_DISPATCH_TOKEN to bypass branch protection 2026-04-11 15:04:22 +00:00
MattJackson 0cb6718238 Bump to v0.7.0 2026-04-11 14:55:52 +00:00
MattJackson 1d46ced137 Add StdioStream, IsoStream; enforce scheme:// URL format 
- StdioStream: stdin/stdout pipe, format-agnostic
- IsoStream: read BD-TS from Blu-ray ISO images
- URL resolver: bare paths rejected, all URLs require scheme:// prefix
- Validation: empty paths, missing ports, read-only/write-only errors
- Tests: 22 passing (URL parsing, validation, metadata roundtrip)
- Docs: full stream table with 7 stream types
 2026-04-11 14:54:28 +00:00
MattJackson bc9bf022ea Add IOStream trait and stream-based I/O architecture 
Introduce IOStream trait for uniform read/write across disc, file,
network, and null streams. Rename Title→DiscTitle, add stream URL
resolver, split old stream.rs into focused modules (m2ts, mkvstream,
network, disc, null, resolve, meta).
 2026-04-10 19:13:53 -07:00
MattJackson 026b6e7a43 Support multiple host certs, expose handshake_error on AacsState 
- host_cert: Option → host_certs: Vec (try all until one succeeds)
- handshake_error field shows why auth failed (e.g. cert rejected/revoked)
 2026-04-10 09:48:29 -07:00
MattJackson 914891feef Bump to v0.6.1 — republish with open() all drives, AACS 2.0, has_profile() 2026-04-10 09:30:15 -07:00
MattJackson b8b00f2121 v0.6.0: changelog, open() all drives, AACS 2.0, MKV muxer 2026-04-10 09:26:45 -07:00
MattJackson dd9f10439c Update README for v0.6.0: AACS 2.0 done, open() all drives, .cargo gitignore 2026-04-10 09:24:01 -07:00
MattJackson a07b2a85a4 Remove orphaned jar.rs — replaced by labels/ module 2026-04-10 09:17:11 -07:00
MattJackson c3e50f3a2e open() works on all drives, AACS 2.0 handshake wired, raw_gc_010c on DriveId 
- DriveSession::open() no longer requires profile match — works on any optical drive
- init()/probe_disc() return error gracefully for unknown drives
- find_drives() returns all optical drives (PDT 0x05), not just profile-matched
- has_profile() check for callers
- AACS 2.0: handshake wired into resolve_aacs() — real VID + read_data_key
- DriveId: added raw_gc_010c field for GET_CONFIG 010C response bytes
 2026-04-10 08:48:41 -07:00
MattJackson 5990ec9566 Fix test failures: correct EBML size assertion, fix doc tests 
- Fix write_size test: 127 encodes as [0x40, 0x7F] not [0xC0, 0x7F]
- Mark doc examples as ignore (use incomplete pseudo-code)
 2026-04-10 08:23:32 -07:00
MattJackson 01d26c8e33 Fix compiler warnings: remove unused imports and dead code 
- Remove unused NAL_SLICE and NAL_SEI constants from h264 parser
- Remove unused aacs import from Disc::scan()
 2026-04-10 08:21:55 -07:00
MattJackson 70c75ca374 Add design docs for API and MKV muxer architecture 2026-04-10 08:19:53 -07:00
MattJackson 0b014287a3 Add MKV muxer and event system 
- Add event.rs: structured event system for progress reporting
- Add mux/: MKV muxer pipeline (EBML writer, TS demuxer, stream assembly)
  - Codec parsers: H.264, HEVC, AC-3, DTS, TrueHD, PGS, VC-1
  - Lookahead buffer for codec private data extraction
  - Direct m2ts-to-MKV streaming without intermediate files
 2026-04-10 08:19:40 -07:00
MattJackson 24345bc202 Refactor error types: replace generic AacsError/DiscError with typed variants 
- Split AacsError { detail } into 13 specific error variants (AacsCertShort,
  AacsAgidAlloc, AacsCertRejected, etc.) with unique error codes E7001-E7012
- Split DiscError { detail } into 7 specific variants (DiscRead, MplsParse,
  ClpiParse, UdfNotFound, DiscNoTitles, DiscTitleRange, DiscNoExtents)
- Add WriteError (E5001), KeydbLoad (E8005), MuxLookahead (E9000), MuxWrite (E9001)
- Add OpenDisc API for single-call open+scan+rip workflow
- Remove all English text from error Display impl (code-only output)
- Normalize doc comments to use -- instead of em dash for ASCII consistency
 2026-04-10 08:19:28 -07:00
MattJackson ad592d244b Code audit: fix unused variables, update docs 
- Fix unused variable warnings in profile parsing (|e| -> |_|)
- Fix outdated 'freemkv info --share' reference in README (now drive-info)
 2026-04-10 08:19:01 -07:00
MattJackson 5949bcee89 Remove SpeedTable, add probe_disc(), named constants, clean architecture 
- Removed SpeedTable entirely — drive manages speeds after probe
- Renamed read_speed_table() → probe_disc()
- Named all SCSI constants: SUB_CMD_UNLOCK, SUB_CMD_INIT, SUB_CMD_PROBE,
  INIT_ADDR_BD, INIT_ADDR_UHD, PROBE_COARSE_END, PROBE_FINE_END, etc.
- Auto-detect BD vs UHD from disc capacity for correct probe init address
- Fixed NOMINAL_SPEED_B (was invalid CDB, removed — single max instead)
- Added session.set_speed() for simple speed control
- Error recovery: re-init on first error, BD2x on repeated errors
- Batch size uses full kernel limit (was 80%, now 100%)
- Clean variant_a/variant_b with named constants

API: open() → wait_ready() → init() → probe_disc() → scan() → read
 2026-04-09 15:17:25 -07:00
MattJackson 5c73d9d5a0 Speed table: generic zone-based speed management 
- SpeedTable: maps disc positions to optimal speeds
- Default: max speed everywhere (drive manages itself)
- After read_speed_table(): calibrated per-zone speeds
- One u32 comparison per read on hot path
- Error recovery: reduce() / resume() override table temporarily
- Replaces old tier-based speed management in ContentReader
- MT1959 split into mod.rs + variant_a.rs + variant_b.rs
- PlatformDriver: init() + read_speed_table() + is_ready()
 2026-04-09 13:33:02 -07:00
MattJackson d7d13d2849 Update README: v0.6.0 API, real sample output 2026-04-09 13:03:00 -07:00
MattJackson 81a88dcad0 Profiles v2: chipset+variant top-level keys, minimal per-drive data 
profiles.json: { "mt1959_a": [...], "mt1959_b": [...], "renesas": [] }
Each profile: identity + signature + firmware (3 fields)
Platform enum replaces Chipset — section determines variant
 2026-04-09 12:50:44 -07:00
MattJackson 7c8c26af24 Bump to v0.6.0 2026-04-09 12:39:50 -07:00
MattJackson ae973cb077 v0.6.0: Clean API, chipset-keyed profiles, streamlined platform driver 
- API: open() is OEM-only, wait_ready() separate, init() optional
- Profiles: chipset-keyed JSON ({ "mt1959": [...], "renesas": [] })
- Profiles: identity group, variant + signature + firmware per drive
- Platform constants: mode, buffer_id, nominal speed, verify commands
  moved from profiles to code (variant-determined, not per-drive)
- Removed unused fields: register CDBs, speed tables, status data
- Platform driver: unlock + firmware upload + calibrate + speed only
- Cross-compile fix: build.rs uses CARGO_CFG_TARGET_OS for framework linking
 2026-04-09 12:38:02 -07:00
MattJackson b1d1a17cfa Update profiles: fix data extraction offset 
Firmware payload was extracted 12 bytes too early — included handler
table pointers instead of actual microcode. Fixed by scanning for
function table position (VM address pattern) instead of magic offsets.

All 206 profiles regenerated. Cold boot firmware upload should now work.
 2026-04-09 08:37:23 -07:00
MattJackson 6784829856 Update README and CHANGELOG for v0.5.0 
- 12-23 MB/s read speeds, kernel transfer limit auto-detection
- Full custom firmware init pipeline (all 10 handlers)
- MPLS parser fixes (PGS language offset, secondary streams)
- 206 profiles with full per-drive data
 2026-04-09 07:27:10 -07:00
MattJackson 7fcbcff6e5 Fix subtitle language parsing: PGS in audio slots, secondary PG entries 
Two MPLS parsing issues:

1. PGS subtitle (0x90) appearing in audio stream slot: language was read
 from audio offset sa[2..5] instead of PG offset sa[1..4], causing
 truncation ("ng " instead of "eng"). Fixed by detecting PGS coding
 type in audio slots and using correct offset.

2. Secondary PG (PiP subtitle) entries were not consumed, causing
 position tracking to drift. Added missing n_pip_pg loop.

3. Added stream_type 5/6/7 attribute parsing for secondary audio/video.
 2026-04-08 22:41:07 -07:00
MattJackson ef38a90109 Fix read speed: detect kernel max transfer size, fix phantom streams 
Root cause: READ_10 requested 510 sectors (1MB) but kernel sg driver
limits to max_hw_sectors_kb=120 (60 sectors). All bulk reads errored,
error handler fell to 3-sector reads → 4.8 MB/s instead of 12+ MB/s.

- detect_max_batch_sectors() now resolves sg→block device via sysfs
 and uses 80% of kernel limit for safety margin
- Default fallback reduced from 510 to 48 sectors
- ContentReader uses per-device detected max, not hardcoded constant
- Filter out coding_type 0x00 (empty/padding) stream entries
- Add MPLS stream_type 5/6/7 attribute parsing (secondary audio/video)

Tested on BU40N: 4.8 → 12.5 MB/s sustained, 23.7 MB/s peak.
 2026-04-08 22:30:08 -07:00
MattJackson 475cfadfc8 Lock down Platform trait: pub(crate), only init/set_read_speed/is_ready 
Platform trait is no longer publicly exported. External code uses
DriveSession only — cannot call unlock, load_firmware, calibrate directly.

- Platform trait: pub(crate) with 3 methods only
- All handlers are private methods on Mt1959
- DriveStatus moved to mt1959 internal struct
- init() has guard: no re-init if already ready
- set_read_speed() has guard: no-op if not calibrated
- Removed open_unlocked() — open() is the only entry
- Removed Platform and DriveStatus from public exports

Prevents: out-of-sequence SCSI commands, double-init, wrong firmware writes.
 2026-04-08 21:41:57 -07:00
MattJackson 97407570ed Clean pipeline: one open, one init, no double-init 
- Removed open_unlocked() — open() is the only entry
- Removed redundant init() call from open_title()
- init() called once in open(), handles everything
- Each function does one thing: open→init→scan→read
 2026-04-08 21:35:48 -07:00
MattJackson 490c597995 Fix init() hang: make status() non-fatal, single attempt 
status() (sub_cmd 0x13) returns ILLEGAL REQUEST on some drives.
Was retrying 6× with 30s timeouts = 180s hang during init().

Steps 1-10 all pass on hardware:
 unlock: OK, load_firmware: OK, calibrate: OK,
 register_a: OK, register_b: OK
Only status fails — not needed for reads.
 2026-04-08 21:27:34 -07:00
MattJackson c5b0ab3156 Fix PGS subtitle misclassified as audio in STN parsing 
When MPLS STN table parsing drifts (disc-specific alignment issue),
a PGS subtitle entry (coding_type 0x90/0x91) can appear in the audio
stream section. Previously this showed as garbled "ng PGS 5.1" audio.

Fix: guard in stream builder checks if audio-typed streams have
subtitle codecs and reclassifies them as subtitles.

Also: unknown stream types now filtered out (filter_map) instead of
creating fake Video entries that showed as "?" in output.

Tested on V for Vendetta BD — "ng PGS 5.1" gone, clean output.
 2026-04-08 21:14:39 -07:00
MattJackson eb4d89b251 Bump to v0.5.0 2026-04-08 20:53:54 -07:00
MattJackson bb9f996afc Update profiles.json: 206 drives with complete data 
Generated by: profile generator --profiles sdf0.bin keys.json --drive-db drive_profiles.json
206 profiles (66 A + 140 B), all with identity from brute-force dictionary.
No manual merging. One tool, three inputs, complete output.
 2026-04-08 20:51:15 -07:00
MattJackson 766ffc70f6 Update profiles.json: 206 drives 
New profile format includes all -verified fields:
- ld_microcode (base64): firmware payload for WRITE_BUFFER/MODE_SELECT
- hardware_register_a/b_cdb: pre-built 10-byte SCSI CDBs
- drive_nominal_speed_cdb: calibration SET_CD_SPEED
- speed_zone_table, speed_calc_table: operation speed constants
- unlock_init_value, unlock_response_size_minus_init
- drive_signature: per-drive unlock check

206 profiles (66 mt1959_a + 140 mt1959_b), 661KB.
Identity fields merged from drive database.
All 32 tests pass.
 2026-04-08 20:46:40 -07:00
MattJackson 91d813ab51 Fix variant B firmware upload: MODE SELECT not WRITE_BUFFER 
B firmware upload () byte-level verification reveals:
- Step 1: MODE SELECT (0x55), NOT WRITE_BUFFER — sends 2496 bytes (0x9C0)
- Step 2: Check result == 2
- Step 3: READ_BUFFER mode=6 offset=0x3000 (16B firmware metadata)
- Step 4: WRITE_BUFFER mode=6 (16B from fw_write_data)
- Step 5: Vendor verify CDB (0xF1 opcode from blob)
- Step 6: do_unlock × 5 retries + 1 confirmation

Key differences from A:
- A uses WRITE_BUFFER (0x3B), B uses MODE SELECT (0x55)
- A sends 1888 bytes, B sends 2496 bytes
- B has extra READ metadata + WRITE 16B + vendor verify steps
- B retries unlock 5 times (A does 2)

Added profile fields: fw_write_data (16B), verify_cdb (10B) for B-only.
 2026-04-08 20:40:37 -07:00
MattJackson 3ee0f0cedf mt1959: separate A/B firmware upload paths 
A (): single WRITE_BUFFER → verify 0x45 → unlock×2
B (): WRITE handshake → READ 0x3000 → WRITE 16B → verify → unlock×5

9/10 handlers are identical A/B. Only load_firmware has different logic.
Both paths end with do_unlock() — firmware upload is a prerequisite for
unlock, not a substitute. init() tries unlock first, falls back to
load_firmware only on failure (cold boot).
 2026-04-08 20:35:43 -07:00