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Change bios file to edit PCI settings?

Hello everyone,

I have a custom loop water cooled system and I’m using a pci-e riser cable. 

To get it to boot I had to manually set the PCIE to gen 3 as the riser seems to cause issues. 

I had some issues so cleared CMOS forgetting about this and now I can’t boot. 

Can anyone think of a way past this without breaking my loop open? I was thinking perhaps I could edit a bios file to force the slot to PCIE 3.0?

Thanks, Mark

CPU: Ryzen 9 5950X  | Motherboard: ASUS ROG Crosshair VIII Hero| RAM: 2x16GB 3600MHz Corsair Vengeance Pro RGB | GPU: NVIDIA RTX 3090 Founders Edition | PSU: Corsair RM1000x | Case: Lian Li O11 Dynamic Razer Edition | Cooler: Corsair H150i | SSD: Corsair MP600 500GB PCI-E Gen 4 | Monitor: x3 Razer Raptor

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