Vivo v21 phone uses the Galaxy S7 edge, using custom firmware. As far as I can tell, this requires no root and should be possible with a rooted device running Android 8 or better. 2. The only thing you need to do is install KNOX from its website (which costs $29). Since your stock ROM will contain everything needed for VIVE in addition it needs to be installed through that path instead of manually downloading something like ClockworkMod Recovery first. :) If you want to try out different apps while doing so just follow along until each app has an icon on top then choose which one you would rather use after switching between them vi. Phone details 8GB ram | 128 GB rom 16.36cm (6.44 inch) full HD+ display 4000mAh lithium-ion battery Media Tek dimrnsity 800U processer AMOLED display
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