How to unlock blackliat device
I purchase this phone from local seller i pay him but now i can't find him to claim and get my money back or Remove my device from blacklist
Question marked as
The message you showed doesn't mention that the device is blacklisted, there is nothing called blacklisted devices at Apple.
Please check this article to learn how to activate your iPhone, hopefully this resolves your problem.
If you can't activate your iPhone or iPad (Wi-Fi + Cellular) - Apple Support