Did I brick my MBP mid 2015?

Quick explanation, I bought my MBP from a shady website, turns out it was MDM enrolled but I didn't know that so when I updated from 12 to 15.5 everything was working until next day when it asked me to enrol to MDM but when it installed smth and now after a minute it crashes, goes to recovery and is fucked. I can't reinstall macOS as wifi driver ain't working in recovery and I don't have another Mac. Also any sort of recovery won't work as it locked itself with a firmware password and I don't know it. Please help 🥺