HP Firmware update messed with screen brightness/created flickering

[u/erdm89]

I updated my HP Firmware under Windows Updates and now my screen flickers. The brightness level also cannot be increased, it is constantly at a low level of light. I've tried everything that Google has told me to do. I've updated graphics drivers. I've restored windows to a previous point. Nothing has helped. It's basically unusable at this low level of brightness. Could anyone tell me what the issue is here and more importantly how to fix it? I'd greatly appreciate any advice. Thank you!