Use this forum to chat about hardware specific topics for the ESP8266 (peripherals, memory, clocks, JTAG, programming)

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By jemy
#59372 I have the same problem. I use ESP8266 DOWNLOAD TOOL V3.4 rightaway it detect efuse error won't able to burn it at all. when I use nodemcu firmware programmer got loop:
Fatal exception (0):
epc1=0x40211558, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x00000000
after jump to run user1
it has no problem before.
all I did is upload new program by using new version Arduino 1.6.12 and esp8266 v 2.3.0
I upload a program and found it didn't run well and after I uploaded at second time got Fatal exception (0): loop.
I tried two new board and got same problem.
I am wondering is it possible the uploader can mess up the efuse I mean destroy it. software destroy hardware like virus?