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when trying to upload code to NodeMCU v3, sometimes I get the error "the selected serial port _ does not exist on your connected board" and sometimes "timed out waiting for packet header". My attempts for this problem:

  • No cable is connected to any pin,
  • I changed the USB port,
  • Then I checked the components of the card, everything seemed fine.
  • I checked the pin headers, there was no bridge.
  • Then I cleaned the whole board 4-5 times with 1-minute intervals for the possibility of solder paste.

Still, the result did not change, what can I do in this case?

EDIT I opened serial monitor with "74880 baud" and pushed to rst output is,

02:49:04.182 -> 
02:49:04.182 ->  ets Jan  8 2013,rst cause:2, boot mode:(3,7)
02:49:04.228 -> 
02:49:04.228 -> load 0x4010f000, len 3460, room 16 
02:49:04.228 -> tail 4
02:49:04.228 -> chksum 0xcc
02:49:04.228 -> load 0x3fff20b8, len 40, room 4 
02:49:04.228 -> tail 4
02:49:04.228 -> chksum 0xc9
02:49:04.228 -> csum 0xc9
02:49:04.228 -> v00062500
02:49:04.228 -> ~ld
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    On what OS are you? You might need to install the drivers for the CH340 chip, which does the USB communication. Commented Feb 15, 2022 at 20:11
  • I installed and uptaded driver for CH340 Commented Feb 15, 2022 at 20:59
  • Are you pressing the "boot" button on your NodeMCU during reset, to put it into Flash mode manually before attempting to program it? Commented Feb 16, 2022 at 6:29
  • I tried that but result doesnt change Commented Feb 16, 2022 at 16:55

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