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
