I was updating firmware from 9.0 to 7.1 not sure what when wrong but now i'm getting no signal. not sure what happended is there anything I can do to get my box back? I've already done it to other boxes without an issue. :(
Not sure by what you gave, but you can't downgrade via SD Card, you have to use USB method and flash the ROM file with the version of Android you wish to have.
Beelink GT1 Mini (95X2) w/CoreELEC & Android 9 (Pie)