Download iPadOS 9.3.5 (13G36) for iPad 3 (WiFi)

You will have to note that you can only restore signed IPSW firmware files using iTunes or 3utools.

✅ This IPSW firmware is Signed

Firmware Identifier iPad3,1
iPadOS Version 9.3.5
Release Date 2016-08-25
Update Date 2016-08-20
Sha1sum
311df97224bbfaa6ac91546b62aeb1e758005ff2
Sha256sum
ceec5670fe63f113b766a09b189c50a31e96e4c538905076216fb21170385c95
md5sum
147f6d63f39d5dcd607a60afb0325005
Size 1.56 GB
FileName
iPad3,1_9.3.5_13G36_Restore.ipsw
Status

Download IPSW (1.56GB) Check device info
Release Notes

It should be noted that these are the official release notes for the from Apple

iOS 9.3.5 provides an important security update for your iPhone or iPad and is recommended for all users.

For information on the security content of Apple software updates, please visit this website:

https://support.apple.com/kb/HT201222