Is it possible to reset iphone without erasing all data?

Yes, you can restore your iphone by factory reset via a computer. Connect your iphone to iTunes (Windows/macOS) or Finder (macOS Catalina+). Before restoring, back up your data using iTunes/Finder, iCloud, or MobiKin Assistant for iOS to avoid losing contacts, messages, photos, and more. Once backed up, select Restore iphone and confirm. Your iphone will be erased, the latest iOS installed, and it will return to factory settings. Afterward, you can set it up as new or restore your backup to recover all your data safely.