GhostCalc WROOM 16 MB installation and recovery flash

Target: WROOM_N16R8 · V2_16M · 16 MB flash

Warning: The recovery image erases settings, notes, pairing state, and cached media. The exact GhostCalcCameraWroomV1.2.1 build already has the correct 16 MB layout and updates through the app; do not use this destructive image for that normal update.

The improved hotspot recovery runs after GhostCalc2.4.3 is installed. Use stable Wi-Fi for the first update from older firmware; if that cannot complete, use this one-time USB recovery path.

Download gc-wroom-20261001-19dd3280dd31-recovery.bin and verify SHA-256 19dd3280dd319ffac73680cebf6a8edb6140ba607ce05e974bc353f1668474fa.

python3 -m esptool --chip esp32s3 --port PORT --baud 921600 write-flash -z 0x0 gc-wroom-20261001-19dd3280dd31-recovery.bin

The packaged ESP_FINAL/tools/flash_merged.sh PORT helper performs the same target-specific recovery flash.