Use a tool like BalenaEtcher or Win32DiskImager to write the firmware to your new SD card.
Always clone your stock SD card before formatting it. These devices are notorious for having unique screen drivers; if you lose your original files, you might end up with a "white screen of death." sup m3 custom firmware high quality
Before you begin the flashing process, keep these three rules in mind: Use a tool like BalenaEtcher or Win32DiskImager to
There are several versions of the M3. Ensure the firmware you download is compatible with your specific board revision (usually found by opening the battery compartment). The "Quality" Installation Workflow if you lose your original files