(Always follow the ROM author’s specific instructions.)
This is the most crucial step in the process. "vivo Y51" is a confusing branding umbrella. There are at least two distinct major hardware versions: vivo y51 custom rom upd
The most reliable way to update your device is through the official Funtouch OS channels. Check for Updates : Navigate to Settings > System upgrade (Always follow the ROM author’s specific instructions
Since custom ROMs aren't feasible, the article would suggest: but its official software
Revitalize Your Vivo Y51: Complete Guide to Custom ROMs & Updates remains a favorite for many, but its official software, Funtouch OS