Marlin 2.0.8 For ER20 (2021.11.29)

New feature and improvements:

1. Enabled the PID-TUNE feature.
   Users can use this feature to calibrate the hotend temperature.
2. Added the "Calibrate Gantry" custom gcode on the LCD menu.
3. Added a faster ery sensor homing speed config to switch.
4. Improvement of the ery sensor Auto bed leveling multi-probe disabled.
5. Please check more details at readme.md file.

Marlin 2.0.8 For ER20 (2021.5.24)

Support the 2 versions of the firmware

1. En version
2. Multi-language version

If you upload the multi-language firmware failed. (It will show you the BLUE SCREEN WITH NOTHING)
Please use the En version then it will work. This bug is caused by the bootloader version being different.

Marlin 2.0.8 For ER20

This version tested 1 week and now release it