Thanks for your support in this case! So we have now checked the chips. We have WROVER-E (ESP32D0WDQ5 rev3) with Flash Manufacturer: 20 which are working with our "wrong" HW bootstrap and 1.8V VDD_SDIO the new reel has the same chip but Flash Manufacturer: 68. There we get the errors during our prod...

ok, so it is working to set the voltage to 3.3V via eFuse. That is good, as we have already 400pcs mounted.

So is it correct that all ESP32­WROVER­E has 3.3V and all ESP32­WROVER­ has 1.8V? What if excitedly write the 3.3V eFuse on an old 1.8V ESP32­WROVER­?

Thanks for the support

Thanks, I have seen this in the manual, but how do I know which flash type is connected (1,8V or 3,3V) as it is a wrover SOM. Thought the correct voltage is set via efuse from espressif?!

We have for more than 3 years a project running and shipped more than 1000 devices. On a new production lot we took chips from a brand-new reel of ESP32-WROVER-E-N8R8. On all of this SOMs we have an issue with the flash. The ESP32 chip communication is fine but the esptool.py flash_id returns all FF...