You can use EFT dongle, UMT dongle, octopus FRP tool, MRT to remove FRP and pattern lock from Vivo Y33s or you can try other tools using above test point to boot your phone in download mode.
How to find Test Point of Vivo Y33s.
- Install "Vivo Y33s MTK USB Driver" on windows computer.
- Remove the back of the device carefully, making sure that you won't damage any parts.
- Now check the screenshot below and find the Vivo Y33s Test Point.
- Remove the battery and short bot points using any copper wire and attach the USB cable at the same time.
- Now you can freely flash stock ROM on Vivo Y33s mobile using any tool.