xteink4

Flashing Firmware
The recommended tool from the github repo is https://xteink.dve.al/
Connection Issues
Arch Linux (EndeavorOS)
If you encounter issues connecting to web serial try the following
Possible Error
xteink (index):1 Uncaught (in promise) NetworkError: Failed to execute 'open' on 'SerialPort': Failed to open serial port.
ls -l /dev/ttyACM0
Check which group you are in
`crw-rw---- 1  
If your user doesn't appear add the user by doing the followin g
sudo usermod -a -G <group> <username>
References
https://support.arduino.cc/hc/en-us/articles/360016495679-Fix-port-access-on-Linux

XTC / XTCH
XTC / XTCH is the proprietary container format that the xteink4 uses.
Converting to these formats yields better results.
Converter: https://x4converter.rho.sh