That’s good to know it does help on the stability!
Did you try to change the SD mounting type from 4-bit to 1-bit for that tricky one?
Maybe it is an SD card limitation.
You could try it just like here to test it: </s> // Mount SD Card
if(!SD_MMC.begin("/sd",true)) {
Serial.println("Card Mount Failed,please reboot the board");
while(1);
return;
}<e>
Got it! I wasn’t aware of that unburned fuses.
Nice!!!
Could you send us a summary of the efuses? Something like:
</s>espefuse.py -p COM4 summary<e>