I try to flash samd21g18a MCU.
1.use ATMEL-ICE SWD LINE
2.PORT PCB J401
1.I compiled t2-firmware
2./build I get firmware （boot.elf and firmware.elf）
after flash boot.elf, my devie blue led start to blink,
but,PC usb restart again ande again
I can not connect to my T2
is someone would like to tell me how to fix it?
my devie have crashed