It's definitely a bug. I've discovered that it is hit or miss using the QIO mode. Sometimes it works, others, it goes into a recurring reset mode where the chip continually resets itself. To get out of that mode, I have to remove and re-apply power, put the board in bootloader mode and then upload u...

Setting the Flash mode to QIO worked!

Just out of curiosity What is the difference between DOUT and QIO?

Thank you so much. I've been searching the web for days looking for a solution. It is people like you that make these forums so valuable.

Regards.

Hello, I have a Adafruit QT Py ESP32-C3 development board. I am trying to save data between resets by using flash (NVS) to store data. Using the ESP Preferences library example ( https://github.com/espressif/arduino-esp32/blob/master/libraries/Preferences/examples/StartCounter/StartCounter.ino ) I g...