I have just flashed a new bootloader as per the instructions here using the firmware the instructions referenced here
I had issues flashing the bootloader using the STM programmer referenced in the instructions. However, I had success flashing the bootloader using the STM programmer found in the download center under tools.
After flashing the bootloader I’ve tried to update the firmware but keep getting a “Device firmware upgrade timeout!” error. I have the jumper set back to the original state prior to bootloader. I can connect via serial and it displays but when I try and run AT commands I get “AT cmd error.”.
I suspect the issue is the firmware upgrade tool is unable to execute AT commands on the module.
- The battery is brand new
- I have tried restarting the PC and RAK device (using button and disconnecting power).
- I was able to successfully flash firmware prior to bootloader upgrade
- I’ve tried different baud rates