This specific firmware fix is designed for engine boards on specific HP LaserJet series. Using it on unsupported models will have no effect or may cause further issues.
Experts suggest it may not work or is not recommended for the M476 or M227fdw models. How to Install the .PRN File
You should only download and apply this file if your printer displays the . This error is often caused by: Sticking solenoids in the fuser or main drive. Worn drive assemblies or gear slippage.