This write-up provides an overview of custom ROM development for the Samsung Galaxy J1 Ace (SM-J110H)
3. Critical Hardware Limitations (The "Spreadtrum Barrier") Sm-j110h Custom Rom
If you decide custom ROMs aren’t for you: This write-up provides an overview of custom ROM
I can provide specific download links or troubleshooting steps for your exact situation. Most stable ROM: Project Spectrum X or TechnoSparx