Some devices have a special power-on sequence to enter bootloader mode, allowing for unlocking. Specialized Solutions for Common Devices Device Type Likely Solution STM32/ARM Cortex Use STM32CubeProgrammer to force RDP level 0. SPI Flash (BIOS/NOR)
The best recovery is prevention. Locking a device should be a deliberate act, not an accident. Integrate the following practices into your workflow: writing flash programmer... fail unlock tool