Hello,

I wrote a small program containing only the initialization of a StamPLC module with its “StamPLC AC” power supply.

When I run “RUN,” the program list is sent to the module, and execution proceeds normally.

However, when I try to download the program, I get the following message:

MPY: soft reboot

   _  __ _               

_ ()/ | | _____ __
| | | | | || |/ _ \ \ /\ / /
| || | | | | () \ V V /
_,||| ||___/ _/_/ V2.4.2

Traceback (most recent call last):
File "boot.py", line 44, in <module>
File "startup/init.py", line 1, in startup
OSError: (-4354, 'ESP_ERR_NVS_NOT_FOUND')
MicroPython v1.25.0-dirty on 2026-02-08; M5STACK StamPLC with ESP32-S3-FN8
Type "help()" for more information.

And the program does not run.

Could someone help me?

Thank you in advance for your response.