M5Core2 - How to restore to pre-installed factory firmware

caccum

I have a 1 week old M5Core2 that is having display driver problems - but everything else seems to work.

What is the procedure to re-flash my M5Core2 back to the pre-installed factory firmware. I see there is a github file on how to do this but only for the AWS version of the M5Core2.

teastain

@caccum What program do you use?
Arduino IDE?

macsbug

Hello@caccum

M5Stack Core2　初期化(工場出荷状態に)してみた
M5Stack Core2 I tried to initialize (factory settings)
https://w-tori.net/wp/m5stack-core2-reset/

M5Stack Core2を工場出荷時のファームに戻す
Restore M5Stack Core2 to Factory Farm
https://qiita.com/Toshiaki0315/items/407cd7b0ed87f7f50617

caccum

@teastain Thanks for asking.
I can use Arduino-IDE or UI-Flow-Desktop-IDE. I have also downloaded Thonny and ESPTools. So far the following has not worked to fix the display:

M5 Burner ==> erase flash, and burn UI-Flow
M5 Burner ==> erase and burn Core2FactoryTest
M5 Burner ==> erase and burn M5Core2TouchPanelRecovery
ESPTools ==> download 16MB flash image from a working m5core2 and flash to the problematic m5core2.
Use "EasyLoader" to burn a program to test all core2 functions per the link on https://docs.m5stack.com/en/core/core2

What is strange is that the only thing not working is the display. The backlight comes on. I can program the three buttons to send sounds to the speaker. I can create button on the touch screen that activate though I can't see them. If I print a label to the screen the device will freeze.

caccum

@macsbug Thanks for responding.
I have tried those two solutions and it didn't work:

M5Burner - erase flash, burn UI-Flow
M5Burner - erase flash, burn Core2FactorTest; I actually think it was this program that initially killed my display driver; I have two new m5Core2's and I wonder if this programs is installing the wrong display drivers for my new Core2.
M5Burner - erase flash, burn M5Core2TouchPanelRecovery; I also tried this program but it was hard to use as I couldn't see the display menu; I used the power button to blindly select each of the two firmware drivers and to load them.

teastain

@caccum Well, speaking personally:
I believe the BootLoader is deep inside and indestructible.
I would use Arduino IDE to upload this basic LCD sketch:
https://github.com/m5stack/M5Core2/blob/master/examples/Basics/display/display.ino