A reset can take anywhere from 10 to 30 minutes. If your battery dies halfway through the process, you risk corrupting the system software, potentially "bricking" the phone.
: Tap Erase all data again. You may be asked to enter your PIN or screen lock to verify the action. How to Factory Reset VIVO Y28 5G
You will now see a summary of what will be erased: A reset can take anywhere from 10 to 30 minutes
Read this carefully. If you haven’t backed up, go back and do it now. You may be asked to enter your PIN
Scroll down and tap on (or "System" on some VIVO versions).
Once the reset is complete, your phone will behave like a brand-new device. Here is a quick post-setup checklist:
This usually happens if you have a "Device Administrator" app active (like a work email or antivirus). Go to Settings > Security > Device admin apps and deactivate all admins. Then try the reset again.