Download and Install Tool in macOS
Download here:
https://mega.nz/folder/M9wDDbQC#Yz3Gnsdj_N2FbVrKdaKcnw
Restore device Fresh with 3uTools or iTunes or Apple Configurator2
Download latest iOS from
www.ipsw.me
Note:
1. Dont do user data retain flash
2. Dont use service on “Unable to Activate” or “Baseband Issue” device.
Connect device to Wifi and let in “Activation lock” screen
Open Tool and Click “Boot”
After Successful Boot Navigate to Website
Register Your Device with Serial Number
Activate Device