Bypass F1 Error HP 6200 Pro SFF

[sebago]

Hi,

Recently I bought a HP Compaq 6200 Pro SFF and put a GTX 1050ti LP in it. 
Since I wasn't sure the power supply could handle the power draw I replaced it with a more powerfull one.
The motherboard uses proprietary connections to connect to the psu but with some repinning of these connections to a 24 pin it worked.
Everything is up and running and it works great but everytime I boot the PC i get an error "515-Power Supply fan not detected" and have to press F1 to continue. There is no option in the BIOS itself to disable this error message. Is it however possible to delete this safetycheck from the BIOS and flash the edited BIOS? 
I am currently using BIOS version 02.29 Rev.A (I think it is an AMI BIOS but I'm not sure.)

Thanks in advance.
Sebago