If SWD/JTAG is disabled but not permanently fused, you can often recover the chip using the internal bootloader.
If the process fails at the phase, it means the sequence broke down before the flash programmer could boot up in the target device's RAM. The root causes generally fall into four categories: 1. Cryptographic and Security Mishaps writing flash programmer... fail unlock tool
To prevent bricking your hardware or getting permanently locked out during future development cycles: If SWD/JTAG is disabled but not permanently fused,
Install the filter driver and filter your device’s bootloader port. Run the Bypass Tool and click Crash PL or Bypass . writing flash programmer... fail unlock tool