The following files are firmware that should work on most ESP32-S3-based boards with 8MiB of flash, including WROOM and MINI modules.
This firmware supports configurations with and without SPIRAM (also known as PSRAM) and will auto-detect a connected SPIRAM chip at startup and allocate the MicroPython heap accordingly. However if your board has Octal SPIRAM, then use the "spiram-oct" variant.
Program your board using the esptool.py program, found here.
If you are putting MicroPython on your board for the first time then you should first erase the entire flash using:
esptool.py --chip esp32s3 --port /dev/ttyACM0 erase_flash
From then on program the firmware starting at address 0:
esptool.py --chip esp32s3 --port /dev/ttyACM0 write_flash -z 0 board-20210902-v1.17.bin