These are , not hardware failures (usually).

He clicked "Flash." The progress bar crawled to 7%... and froze.

Download the .img (ISO) file specific to your board version. Enter Flash Mode:

: If you only use your box for media (Kodi), installing LibreELEC to an SD card is often better than any Android firmware, as it runs entirely in RAM and is significantly faster. Preparation Checklist

If your box still boots, try to perform a backup using a tool like before flashing anything new. Match the Board Version:

//