It seams that your are almost expert，and I’m sorry that if you don’t want to lose data on the phone, and you want to fix disabled iPhone, it’s impossible, unless you have the screen password to unlock it after limitation time on the iPhone. No considering of iPhone data, you can force factory reset iPhone to fix disabled iPhone, it’s the last free way, or use the tool to fix disabled iPhone, but also lose all data on iPhone.

With the developement of iCloud, I don’t recommend DFU or Recovery mode to force factoryr reset iPad, because of Find My iPad feather, force factory reset will make iPad locked by activation, we need Apple ID and password to bypass activaton lock. We can fix disabled iPad for free with the iCloud when we have Apple ID and password, the Erase feather on iCloud can fix disabled iPad, but without Apple ID either, turn to the tool to fix disabled iPad, but will erase all data on iPad after the process, so, think about it.