After flashing ESP8266 with MicroPython I get this error rf_cal[0] !=0x05,is 0x31 on repeat and cannot get out of bootloader
I have 3 esp8266 boards, 2 of them run CP210 drivers and one of them runs CP340. everytime I try to flash one of them with micropython, the board keeps flashing blue led rapidly and gets stuck on bootloader with the following repeating messages: