If you only done a software factory reset, that won't help. You can do a hardware factory reset, that'll work. Not necessary though, all you do is enter the recovery mode and clear the cache partition and you should be back up with functioning Wi-Fi feature again. Then you'll need to apply the firmware update via Beelink OTA updater. If you don't apply the firmware update, you'll eventually be back in the same boat, with non-functioning WiFi.
Beelink GT1 Mini (95X2) w/CoreELEC & Android 9 (Pie)