iOS 15.3.1 updated IPad but having issues
so finally got 15.3.1 to update on ipad 9.7wifi only with assistance of laptop. Now ipad is flashing a black screen to apple icon white screen for 10-15 min before it goes to logon screen. Will eventually find wifi, works for maybe 5 minutes then back to flashing. I have reinstalled, updated drivers, cleaned out unnecessary apps, have hi speed internet and loads of hard drive, a new laptop and stopped the 6 digit login as suggested in the many fixes I’ve investigated. Our newer iPad downloaded the update and functions fine. Any ideas or suggestions greatly appreciated.