How to update TC/RB-85x:

Prepare DOS to boot. You can do that from USB or prepare CF.
 

1.      Unzip file

2.     Boot  DOS

2.      Chdir into files with BIOS

3.      Execute UP.BAT

4.      Re-boot and press DEL key get into BIOS

5.      Choose Auto Configuration with Optimal Settings, press ENTER, press Y and then ENTER

6.      Press F10


Done.