I performed a sudo apt full-upgrade
update on the latest Buster RC2 image, to be sure I got the latest firmware (EEPROM) for the Raspberry Pi 4.
After this upgrade the Waveshare 3.5c was not working anymore. But when I choose PiScreen 3.5 (v2) I get the UI again? I saw that al sorts of overlay files were updated. Is this a known Problem? How can I solve this?
My waveshare didn’t work when I moved it and the SD card from pi3 to pi4. It did work when I moved it back. No idea why, but when I bought pi 4 case with a similar screen, it wasnt an actual waveshare.
Everything worked fine on the Raspberry Pi 4 (clean new Install of RC2 image), until I upgraded to the latest RP4 firmware. During this proces also a lot off overlay files were upgraded. After this upgrade the Waveshare 3.5c screen did not work anymore.