Production v1 restoration

Keep the working SD and out/y2linux-m3-audio-02/BOOTIMG.img unchanged. Its 4816896-byte image SHA256 is b9dbf6b528e4afbee2a5ffb2fc65df7f6a076564e92960332e24cee3809b5842. Owner-proven BOOTIMG-only recovery remains valid; no new full-ROM restore test was performed. No bootloader, table or protected-data write belongs in recovery.

Tool and stock source

SPFT: /home/luca/Downloads/SP_Flash_Tool_v5.2032_Linux/flash_tool, v5.2032.00 /5.2032.00.sn100, SHA256 d618e7d08ba5a4020038921a95336a3805a4b2cf17a374fd308cc5299ea7d9d8. Bundled DA MTK_AllInOne_DA.bin, SHA256 46cd175d7556e6e80b13f6a70827c6931a5dfa25a09c3cc50e75ba7ff9327618. Use the owner's established connection/power procedure; its precise button/timing sequence is not invented here. A normal SSH/ECM connection is not a DA session.

Original directory: /home/luca/Dokumente/Code/Y2Player/y2_v3.2.0_FM-20260813/. Only recovery-source paths refer to that historical Android project; this firmware is built by and for SchulzCode/Y2Linux. All three overwritten partitions have verified factory restoration sources in manifest.json (size/hash rechecked for this package). They are not exact backups of installed personal Android state.

Stock scatter SHA256: e5fe03e9f3219cc9b5ead27892f2ddb722acc16adce3306d27feb87893cd977e. Verify original sources against manifest.restoration_sources and retain an independently accessible copy before writing. To restore personal Android data, retain a consistent full USRDATA readback before install. Factory userdata only restores factory state; NVRAM/calibration preservation is a separate requirement.

Return immediately to SD development Linux

Load the original stock scatter in SPFT, Download Only. Deselect every row, then select BOOTIMG only and point it to the hashed AUDIO-02 image above. Do not use original scatter default selections. Flash by the owner's proven manual sequence. Read back EMMC_USER0x1d80000, length0x1000000; hash the first4816896 bytes against AUDIO-02. Insert the preserved working SD and boot: AUDIO-02 disables internal eMMC and resolves removable Y2ROOT. Internal Y2ROOT/Y2DATA are retained. This restores the development environment without restoring Android or wiping data.

Restore stock Android factory userspace

With verified original FM sources available, load the original scatter, Download Only, deselect all, then select BOOTIMG→boot.img, ANDROID→system.img and USRDATA→userdata.img. These are the only three selected rows. This destroys Y2Linux root and Y2DATA; export persistent data first if needed. Restore a private preinstall USRDATA backup instead only after confirming that SPFT accepts its raw ext4 representation; do not improvise wrappers or offsets.

Never select PRELOADER, UBOOT/LK, MBR/EBRs, RECOVERY, NVRAM, PRO_INFO, PROTECT_F/S, SECCFG, SEC_RO, MISC, LOGO, EXPDB, CACHE, FAT or BMTPOOL. Do not select Format All, Firmware Upgrade or Write Memory. Abort any request to format, security mismatch, table mismatch or unexpected address/identity.

Read back the written ranges before Android boot; use raw prefix comparison for boot.img and compare material RAW/FILL chunks of stock sparse images against their physical expanded offsets. Stock DONT_CARE chunks have no prescribed hash; a factory sparse image's file SHA256 is not an eMMC readback hash. The corrected Y2Linux raw ext4 images avoid that ambiguity by defining every written byte. Recompare protected/table before/after captures. Then check actual Android UI, storage/audio/device-specific behavior; a green SPFT tick is insufficient.

Stock RECOVERY remains untouched, but its automatic Android filesystem repair, wipe and update functions are not a Y2Linux recovery mechanism. Use SPFT and known images rather than invoking Android wipe menus on the new filesystems.

Missing/broken Y2ROOT or Y2DATA

The production rescue waits for the exact internal filesystem identities and geometry, validates layout/schema and executable availability, and logs errors over ACM while retaining PID1 if those checks fail. It never falls back to SD, formats storage or schedules automatic reboot. panic=0 prevents timed panic reboots in the rescue; init sets panic=10 only at the root handover (a failed handover restores 0), so the running system restarts 10 s after a kernel panic. The final switch_root/exec assumes the validated BusyBox init remains executable; post-handover crashes/hardware faults are not repaired by this rescue. No claim is made that USB observes a crash before gadget initialization.

Reflash only the failed allowlisted image using this release's matching profile, preserving USRDATA unless explicitly restoring/initializing data. Torn BOOTIMG may prevent rescue starting; stock loader + SPFT remains the recovery path.

Storage04 adds y2.rescue=1 as an explicit production command-line entry and y2-status storage|usb|audio|power in both environments. The observer is optional instrumentation; platform drivers and display startup do not depend on it. The retained AUDIO-02 fallback is historical SD firmware, not a charging remedy: Y2Linux charging management and off-state power behavior remain unqualified.