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Y2B-240 authorized preflight — 2026-09-08

Historical record. The dates, candidate identity, "current" claims, next steps and permissions below belong to this recorded boundary. See current state for the latest physically observed result.

The owner explicitly authorized issue #19 as specified: one diagnostic BOOTIMG-only download, one normal boot observed for no more than 60 seconds, then FM BOOTIMG-only restoration and stock function checks. Authorization is recorded; no further flash permission is requested. The procedure and artifact remain unchanged. This is a preflight checkpoint, not an experiment result.

Verified host inputs and settings

  • Fresh recovery verifier: all 24 FM files and SPFT executable/bundled DA pass.
  • All 37 candidate bundle entries pass SHA256SUMS verification.
  • Fresh real-artifact/D08/layout/wrapper/partition validation passes; all 11 tests pass, including emitted watchdog instructions and guarded diagnostics.
  • Candidate: out/m1-risk-accepted-diagnostic/BOOTIMG.img, 1,089,536 bytes, SHA-256 db7d8a5cf082b37f77c8732bd8e1ab742e4205f9383e421b051917f17364ab7e.
  • FM fallback: 5,656,576 bytes, SHA-256 5ef1bdf28481ee0bf5f3528c1ddd91cf3f4d2d5f39e4d0ea049a8137a30f6af6.
  • Original FM scatter SHA-256: e5fe03e9f3219cc9b5ead27892f2ddb722acc16adce3306d27feb87893cd977e.
  • SPFT 5.2032.00 running executable was independently hashed through /proc/150273/exe on the host: SHA-256 d618e7d08ba5a4020038921a95336a3805a4b2cf17a374fd308cc5299ea7d9d8.
  • Actual GUI DA is the original bundled MTK_AllInOne_DA.bin, SHA-256 46cd175d7556e6e80b13f6a70827c6931a5dfa25a09c3cc50e75ba7ff9327618.
  • Actual GUI shows original FM scatter, empty Authentication File, Download Only, and BOOTIMG alone checked with the exact candidate. The final setup log at 22:41:37 Europe/Berlin confirms the same file/size.
  • All 20 normal partition entries in the retained BROM host setup log were reviewed: only BOOTIMG enabled. PRELOADER, MBR, EBR1/2, PRO_INFO, NVRAM, PROTECT_F/S, SECCFG, UBOOT/LK, RECOVERY, SEC_RO, MISC, LOGO, EXPDB, ANDROID, CACHE, USRDATA and FAT are disabled. Scatter BMTPOOL is reserved and is_download: false; it is not a selected target.
  • GUI shows logical image interval 0x03180000..0x03289fff inclusive. This does not change the audited physical BOOTIMG partition interval EMMC_USER [0x01d80000,0x02d80000). No raw-address write is proposed.
  • Existing setup reports USB high speed/auto-detect and DA checksum level 0. These are recorded existing settings; no verification/security option was changed. Host SHA-256 validation is not a device readback verification.

An intermediate GUI view selected the older out/m1-first-boot/BOOTIMG.img. That mismatch was caught before Download and the subsequent GUI/log capture confirms the authorized diagnostic path. Initial saved selections included other ROM files; they are not the verified final selection. Setup-only desktop interaction was stopped when concurrent window/selection changes were detected.

Execution remains pending

No Download control has been activated by this session. The retained tool snapshot contains setup activity, not a device flash result, and the GUI shows 0 Bytes / 0:00. Kernel diagnostics, PID1, heartbeats, resets/freeze, restoration and stock functional results are not observed / not performed.

After host verification, read-only adb devices -l returned an empty device list. Current target identity, cable/port, adequate charge, the owner's proven power/USB sequence and a ready physical screen observer still need recording. The desktop can be inspected, but there is no physical Y2 camera/UART feed; the Linux candidate has no ADB. An unanswered readiness question is not an observation channel or a power/recovery procedure.

Next step is physical coordination for the already-authorized experiment, followed by rechecking actual tool settings immediately before Download. Do not rebuild, substitute a candidate, retry, or expand to M2/full-ROM writes. Issue #19 remains open until trial and restoration evidence is recorded.

Private raw evidence: evidence-private/20260908-y2b240-preflight/; file hashes are retained in capture-index.tsv. Screenshots are desktop SPFT configuration evidence, not photographs of Linux output on the Y2.