Hi there, 

For GTi12, there are two version of BIOS, so be careful when you download the BIOS files. The two versions cannot be mixed or misused.
The first version is From Version T103 to T106, namely you can ONLY update from T103 to T106 or downgrade from T106 to T103.
The second version is from Version T201

Before you flash the BIOS, please contact our support at support-pc@bee-link.com , 
make sure that the BIOS file is correct for your item model, otherwise , it will brick your PC.