Chosen Solution
After the recent upgrade my iphone 7 battery started dying extremely fast and then one morning just displayed the apple logo. I contacted apple they said to connect to Itunes and reboot. I did this and it worked okay for 3 days then did it again i rebooted again and it worked for a day now when i try to reboot it tells me error numbers on the computer and says it cant be rebooted?
What error numbers are you seeing? If you are not concerned about data loss, you could try to do a full DFU restore. this will wipe the phone, and install a fresh version of the latest iOS. If this doesn’t solve the problem, then the phone will probably need to be looked at by an experienced micro-solderer.