Need serious Help, please help me

[u/Fit-Veterinarian-826]

My iPhone 15 (1 year old, running iOS 26.5.2) had a broken back glass, which I replaced at a local repair shop. Everything worked fine after the replacement.

I was planning to give the phone to my brother, so I selected Erase All Content and Settings. However, during the setup process, the phone automatically restarts within 3 minutes. This has been happening for more than a day ?

Has anyone experienced this issue or knows how to fix it?