Hello to all!
I have or better I had the same problem as all of you, how to update from iOS 4.3.3 (or in in any case 4.3.x) to 9.x
I tried with the normal way and bricked the iPad. I unblocked it with reboot quite a few times as I tried different things.
Luckily I found a discussion where some people found a way to do it (link see below).
Basically you need to have the right ispw file to update manually from, using the DFU mode.
I have an iPad 2 GSM, formerly 4.3.3, and this file worked =>
iPad2,2_9.3_13E5191d_Restore
I tried different files that did not work, until I found the right one! Hurray! :)
Here you find all the links I found useful to do this:
Most important:
a link to a discussion where others were successful:
https://discussions.apple.com/thread/727...
How to update manually:
http://osxdaily.com/2015/09/19/update-io...
how to get in the DFU mode
http://www.imore.com/how-to-iphone-ipad-...
a link where to get the ispw file
http://www.techglobex.net/2016/01/downlo...
if it doesn’t work and you brick your iPad, with reboot you can unbrick it:
http://www.cydiaos.com/download-recboot/