I bought a Kickstarter ceramic printer, CeramBot. With this kit you had to upload the firmware to the Arduino. Everything went fine. Later I had an incident where dumb me reconnect a motor with out powering down the printer. Anyway after realizing my mistake and crossing my fingers it worked after I repowered it. Now it doesn't so I went on Amazon purchase a package to replace all the electronics except the display. So I go and recompile and upload the firmware using Arduino IDE 1.8.12. The firmware is Marlin 2.0. Well display wasn't showing bootup message. I used Pronterface to connect to the printer and the one error message I got was
echo:EEPROM version mismatch (EEPROM=? Marlin=V74). So does this mean that I have to find the correct version of the board or what?
So does this mean that I have to find the correct version of the board or what?
No it appears there is supposed to be some kind of data in the EEPROM stored and the sketch checks for it or something. Anyway it is not an Arduino error msg, but is being put out by the sketch. Get in touch with the guys who sent you the firmware to begin with.