Updated to Feb 7.1.1, phone wouldn't allow use of previous PIN to unlock. The link here helped defeat the problem and get me back in.

Just wanted to post in case this happened to someone else. I used flashfire like I have for the last year and it wouldn't recognize a PIN I hadn't changed in 6 months, could try anything from no PIN at all to as many digits as I wanted, as many times as I wanted. Something definitely wasn't right so found the solution online thankfully.

edit: I want to note I do believe this cleared all my previous wifi passwords that were saved.