SJCAM died after FW upgrade

[gazsilaszloo]

Hi! I have a camera like this. I used it with V1.22 FW. i have downgrade to v1.21. After that, the camera does not work and heats up.
Watch the video:

iCloud Photos - Apple iCloud

View, organize, and share photos and videos with iCloud Photos on the web. Changes will sync across your devices with iCloud.

share.icloud.com

iCloud Photos - Apple iCloud

View, organize, and share photos and videos with iCloud Photos on the web. Changes will sync across your devices with iCloud.

share.icloud.com

I tried several FWs. I asked the SJCAM support team. Unfortunately there is no solution so far