Samsung Galaxy Tab 3 7.0 SM-t217t gets MIUI7 and you can download it from here. The firmware is very stable and has multi language support. Its super fast, quick to boot, and offers great user interface. What so great about it is the fact you can find lot of MIUI themed icons from the playstore apps. It even has permission management. MIUI7 for Galaxy Tab 3 is also pre rooted so no need to separately root Galaxy Tab 3 7.0.
If you are using an app that requires root permissions, follow this. To grant root permission open the app that need root permission, will say you have not root access. Now go to "Security" App (MIUI) -> Permissions -> Root Access, and grant root to that app. Alternatively, you can go to individual apps. For that go to “security” app > permissions and you will find a lot of options there. You can install an OTA manually too – just download the zipped download onto your storage and then go into the Galaxy Tab 3 TWRP recovery to flash it. Here is to install the ROM.
– Download The ROM and OPEN GAPPS 4.4 arm pico (http://opengapps.org
– Download lt02ltexx-patcher-3.0.zip https://www.androidfilehost.com/?fid=24499762635999728
– Download The kernel from here
– Boot into Recovery (TWRP)
– Make Backup
– Wipe / Factory Reset
– Reboot System
*After Successful reboot Now Flash The Pico The KK GApps
*After it boots you’ll see FC of AOSP keyboard Go to setting and disable The AOSP keyboard and download another keyboard from playstore.
This MIUI7 for Galaxy Tab 3 7.0 (sm-t217t) is near flawless but the stock camera for some reason is not working. No need to worry as download camera 360 from playstore will make it functional again. Also when the system boots, the AOSP force closes so download any third party keyboard from playstore.