I want to make a custom Feather M0 Bluefruit LE. I know this means that I will have to add a bootloader to the ATSAMD21G18.
I have seen that there are many useful articles in relation to adding bootloader to this chip like
I wanted to make sure that the bootloader will allow me to access the Bluetooth module on the board. Does anyone know if this bootloader will do that? Or is there another type of bootloader I need? Also, do I need a J-link connection on the custom board? can I just use USB?