How “old” is this old iPad?
I do not know why NONE of the regular contributors here ever ask this question or why NONE of the regular contributors here, but, seemingly, me ALWAYS has to point this out, but here we go, again.
If you own an old iPad model that is 9-10 years old, it is not worth bothering with nor worth the time and efforts to resurrect such an old device.
If you own an 2011-2012, iPad 2, 3, 4 or 1st gen iPad Mini, these devices are too old, too underpowered and obsolete, now.
Sorry.
Apple ended support for all 8-10-year old iOS devices nearly 5 years, ago, in 2016.
Third party app developers abandoned and stopped supporting these 8-10-year old iOS devices nearly 3 years, ago, in 2018.
There are, virtually, NO MORE third party apps available from the iOS App Store, any longer!
Third party compatible apps for such old devices are few and far between, now, in 2021.
This includes apps for both iOS 9 AND iOS 10 devices!
AND, NO WAY to initially install any older, compatible, third party apps into these old iPad models.
NO MORE SUPPORT! NO MORE APPS!
If you own 9 or 10 year old iPads, when you do the full erase and reset/restore procedures, this will render these old and obsolete iPads nearly useless.
No apps, and that 5-6 year old iOS Safari Web browser is too old, unsafe and unsecure to be able to use on the Internet, any longer, either!
I am sorry that you had to learn all of this, but this does not change any of the facts regarding these very old iOS devices.
Sorry & Best of Luck to You!