How to untie someone else's flyme account from meizu m3s?

Question

Android

I bought Meizu M3s at a pawnshop and the seller did not give me the password for my flyme account. I tried deleting the account and I was able to do it with a recovery reset. But now when I try to log into my account, they write to me that it is linked to another account.
Now I don't know what to do
Because now I can't reset my account with the help of those support due to the fact that I don't have a box and a receipt. (Russian checks will not work due to the fact that the phone was bought in Kazakhstan)
Firmware version: Flyme 6.3.1.0G Does
anyone have any ideas how to untie someone else's account and go into your own ???

Answer 1

Try to change the serial number of the smart, read how to change it on 4pda in the smartphone topic.