There are minimum specifications for using the iOS 9 on various iDevices, so be sure
to check that system information to help determine everything involved in an upgrade
when a totally new iOS is considered.
Is the computer you have, running a fairly recent OS? If not, you should be aware that
once you upgrade the other items usually require an update or upgrade to match...
You may choose to stay with the older iOS for the older hardware until further research
is done to see what is required for the unit to work; also, since to revert to an older iOS
for the most part has been shown to be difficult or impossible, research is recommended.
Perhaps if you provided other missing information, about what you're using this iPad 2
with, and the OS version of that product, the larger picture would yield a better answer.
Information in your ASC profile indicates the hardware may be too old to upgrade iOS.
{Does your Mini still run Snow Leopard 10.6.x? Do you still have an old iPod Touch?}
In any event...
Good luck in this matter! 🙂