HP 15-bs003ni invalid serial number. How can I solve that. Installed new motherboard...

Good morning. I am OldManIT. Started electronics and PC's in 1985. Started Dos 3.1 and still know dos and all Windows versions. Kickstarted my hobby again in electronics and currently trying to repair motherboards and PSU's, UPS's and Inverters. Also playing with Arduino and Pi Pico. Programming in Python. I was introduced to this forum by Mnciks11 and learned some things from him. Great youngster that will accomplish amazing things. I hope to be able to add value to this forum that already has big names and extremely great knowledge....