I can not upload any program to my Arduino Nano board.
I already tried with the blink example but it does not work, I keep getting the error
stk500_getsync() atttempt x of 10: not in sync: resp=0xe9
It uses CH340.
Hope you can help, thank you.
Try a different USB cable, they do go bad.
Did your last sketch do anything to tie up the serial lines? Try Press & Hold Reset, then start the download.
When you see something like "Compiled xxx of 32xxx bytes", release Reset.
Can be easier to get the timing of the release correct if you select File:Preferences and turn on verbose outputs.
If you have a Programmer, you can try reinstalling the Bootloader.
Select Tools > Processor > ATmega328P (Old Bootloader) and then try uploading again.