If you are looking for tools to repack or flash SD card firmware, these resources are commonly used for similar tasks: Common SD Card Firmware Tools

Once you've found the firmware you want to update to, download it. Ensure it's compatible with your device.

The post had no replies, just a single, poorly translated link:

A simple, command-line interface appeared on his PC monitor. It wasn't a virus locking his files. It was a prompt. REPACK INITIALIZED. Are you the Archivist? Y/N The screen paused.