Automatic bios upgrade on inspiron 5570

Hi

I have the problem that with the bios version 1.2.3 or 1.2.5 my game crashing, I resolve it with downgrade of bios to version 1.1.8 as i have seen in this forum.

Now my problem is that when i reboot my pc, automatically he upgrade the bios to version 1.2.3, i already have unistall the application "dell update" and "SupportAssist", but it did not work.

Please help me to deactivate automatic bios upgrade.