Quick tek? stupid easy no see any fix Phone a Zte X4

[AC Question]

How easy is it too completely wipe this phone? Haven't had any luck with previous phones when i sold to people everything is gone except my personal information go figure what's my options here? Feedback would be greatly appreciated.

 

[belodion]

Have you first removed your Google account? https://forums.androidcentral.com/showthread.php?t=409154