: If the storage chip (EMMC or UFS) is failing, read-only, or dead, the programmer cannot be written to the RAM to initialize the storage. Corrupted Test Points
esptool.py --port COM3 --baud 115200 chip_id # If fails, force download mode: esptool.py --port COM3 --before no_reset write_flash --force 0x0 otadata.bin # Then mass erase: esptool.py erase_flash writing flash programmer... fail unlock tool
High-speed communication (e.g., QSPI) can cause synchronization failures that the tool interprets as an "unlock" failure. : If the storage chip (EMMC or UFS)
Most modern MCUs cannot write directly to internal flash via a low-pin-count debugger (like SWD or JTAG) without temporary RAM code. The process looks like this: writing flash programmer... fail unlock tool