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I was having similar, interesting problems with a HiLetgo NodeMCU board, and found it was a poor ground near the micro USB connector, such that if I just rested my fingertip there I could connect successfully (115200 baud), get a prompt, and interact normally with the board after removing my finger. It seems to be only on initial connection that there's this noise flakiness.
After getting in, I set up connecting the console via wifi (telnet), and connect that way without issue.
dwallersv
@user64975
Connected
$ÝabQbÁaL@$ÙabÁaLBERROR: Prompt not detected - upload failed. Trying to recover...
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I keep getting these errors on nodemcu 0.9
tried esptool.py and nodemcu GIU, esptool flasher etc.
any suggestion?