Latitude 9450 Touchscreen Not Working

I have a Dell Latitude 9450. I recently changed the keyboard and touchpad which involved putting the laptop into service mode. I think this caused issues with the TPM and touchscreen. TPM issues are now fixed but I can't get the touchscreen working. The laptop has just gone out of support by a few weeks.

Originally, it was working in BIOS but not Windows 11. I tried removing all the drivers and updating/reinstalling them all (chipset, serial IO and a couple others) and updating BIOS as well. As nothing worked I searched for some firmware for it and came upon Wacom Touch Screen Firmware Update Utility | Driver Details | Dell Australia. In my haste, I misread the page and thought it said it was for my laptop, as I had already put my service tag in. After flashing it, it no longer worked in BIOS either :(

I have tried flashing the BIOS multiple ways but cannot get it going. Does anyone know if I can get firmware for the touchscreen from anywhere? Is there anything else I can do?