MicroPython Forum (Archive)

Also it happens with other firmwares than Micropython (just tried NodeMCU and it behaves the same).

So I've changed baud rate to 74880 and that discovered following debug log on the serial port: #0 ets_task(40209c10, 31, 3ffe9000, 4) rf_cal[0] !=0x05,is 0xFF ets Jan 8 2013,rst cause:2, boot mode:(3,6) load 0x40100000, len 31812, room 16 tail 4 chksum 0xd9 load 0x3ffe8000, len 1068, room 4 tail 8 c...

I have to say I have same issue with Wemos D1 mini Pro (blinking and not responding to USB except for erase_flash), where I have used 512k image from http://micropython.org/resources/firmwa ... efd650.bin