Does anyone know of a free service manual without an app or extension?

@nikmail12 anytime any of those sites want you to install software, don’t do it. It’s most commonly malware (or worse) and they won’t have the manual that you are looking for anyway. Service manuals are tough to come by due to it’s copyrights etc. Best places are the developer forums. Plenty of GSM forums around that are willing to share those manuals.