how to undo factory reset on Samsung S6 edge

[andyboy88]

I brought a Samsung Galaxy S6 + edge off Gumtree I factory reset the phone and rebooted it now it's asking me to log into the last synced Gmail account so I reset the password on the last synced Google account and log in with it but it keeps saying login to your last sync Google account

 

[Titillating]

https/support.google.com/nexus/answer/6172890?hl=en

Unfortunately, there aren't any legal ways around this. You will need to contact the person who sold it to you for assistance. Device Protection is intended to safeguard your device from theft, so it is designed to be as foolproof as possible. The only way you will get into that phone is to first log in with a Google account that was previously used on the phone.