Calculated checksum='c975121b' Image checksum='ffffffff'

After migrating to Arduino IDE 2.3.6 and Heltec ESP32 Dev Boards 2.1.2, I compiled for Heltec ESP32 LoRa using a sketch that only includes the #include "heltec.h" library. However, I received the following message:

> E (144) esp_cor Eյ }   ͡  Core dump data check failed:
> Calculated checksum='c975121b'
> Image checksum='ffffffff'.

This issue occurred with both old and new Heltec boards (a total of three old boards and one new board). I intend to use esptool to attempt recovery, but I don’t know where to download the firmware code file (*.bin).