Arduino Nano Clone (CH340)

 I have a few cheap Arduino Nano clones, which use the CH340 USB chip.

I had a few problems getting them to work with Ubuntu 22.04 LTS - first the ttyUSBx devices was not appearing, and then there were errors trying to upload firmware.

To get the ttyUSBx working, I had to 

• uninstall brltty as that seemed to be grabbing the device - not a problem for me because I don't use braile, but if I did, it would have needed more faffing.
• add myself to the dialout group in /etc/group
• make /dev/ttyUSBx group read/write
• I still had errors doing upload using either the default nano board or the old bootloader version in the arduino IDE.
• Installed a patched driver for the CH340 chips from https://github.com/juliagoda/CH341SER
• After that, I can upload firmware using the 'old bootloader' version of the Arduino Nano board in the Arduino IDE.

Note, Have just re-checked and I think I am using the original CH341 driver, not the new one, so it must have been the bootloader change that got it working?