Great, if you can just confirm that 3.3 is expected voltage for ESP32-WROVER-E-N16R8 so I can close internal case. We will then assume that flash damage was from external cause or just bad module and continue with production of new devices.

Thank you for help/support!

You are right, we are using ESP32-WROVER-E-N16R8 module. Link to datasheet was link to this module.

We still cannot find proper/expected voltage for flash inside.

Hi,

I am trying to findout internal flash module voltage for my esp32 chip:

esptool.py --chip esp32 --port /dev/cu.usbserial-0001 chip_id
esptool.py v4.8.dev5
Serial port /dev/cu.usbserial-0001
Connecting...
Chip is ESP32-D0WD-V3 (revision v3.1)
Features: WiFi, BT, Dual Core, 240MHz, VRef ...