I was trying to resolve another issue with an audio example but during experiments, my development board switched to non-working state:
- I can't upload and debug any app via SEGGER Ozone debugger (it says "No valid application in flash: Wait until bootloader is done.", then loses connection with the board;
- I can't upload and debug via J-Link GDB Server and host GDB client;
- can't do nothing with FlashMagic tool (It detects my board as LPC1768 device. I change it to LPC55 and try to start the process, but the app says "Operation failed. Failed to autobaud."). It seems I need to check the link mentioned there.
I think the issue can be caused by the J-Flash Lite tool that I tried to use to flash the precompiled example app on the board.
I also have tried to short J10 jumper and press reset, but nothing has changed.
Thanks in advance for helping.
You can't connect your LPCXpresso55s69 board.
You could try below:
1 update the on board debug firmware with LPCScrypt. try CMSIS-DAP as well.
2. use MCUXpresso IDE connect board in ISP mode, do mass erase. then connect board again.