3DS 8.1.0-19U Error problem.

I bought a 3DS XL from eBay that had the error has occurred issue with the Wi-Fi. I've dealt with this issue in the past with my O3DS Smol by disabling Wi-Fi and formatting, but 8.1.0 requires you to go online in order to format. I figured I'd just do the manual unplug Wi-Fi card method, but when I got to the back 4 screws, 2 of them got stripped and I could no longer access the Wi-Fi card. What I had in mind was, install Gateway somehow, downgrade, then format so the issue would be...

3DS 8.1.0-19U Error problem.