Hi,
on my side, it seems the warning happens only flashing my board from Arduino IDE; flashing an application from Espressif IDE, solve the SHA-256 issue.
I will use Espressif IDE instead of Arduino IDE...
I confirm the application runs even when SHA-256 warning is present.

Hello,
I've just successfully re-flashed my board using "Flash Download Tool" and ESP32-C3 "factory_MINI-1.bin".
After that, I've downloaded again my application.
The SHA-256 issue is still present...
Do you have any suggestion to fix the problem?
Thank you for your support.

Hello ESP_Sprite & Pataga for your kind replies.
I never used ESP32 before: I will try to reflash the device, but...I don't know exactly how to proceed.
If you have any link/suggestion to the reflashing procedure, it could help a lot.
Thank you so much for your support.
Kind regards.

Dear all,
I'm facing the following error during boot:

ESP-ROM:esp32c3-api1-20210207
Build:Feb 7 2021
rst:0x1 (POWERON),boot:0xc (SPI_FAST_FLASH_BOOT)
SPIWP:0xee
mode:DIO, clock div:1
load:0x3fcd6100,len:0x420
load:0x403ce000,len:0x90c
load:0x403d0000,len:0x236c
SHA-256 comparison failed ...