Samsung Galaxy Tab A7 Lite was distributed by our state government for promoting technology in the state.
(JUST ELECTION THINGS)
Anyways, the Tabs are coming with Samsung Knox security which cannot be uninstalled, disabled, debloated with adb. The Tabs also come with restrictions by software to change wallpaper of lockscreen / homescreen and probably many other restrictions. (tracking and other stuffs)
ALTHOUGH I MANAGED TO REMOVE THE WALLPAPER RESTRICTION 
(Screenshot attached) The Tab also comes with a work profile already by Govt.
The problem is that if you try to unlock the bootloader you can't boot by to the system because of the policies enrolled with the each device specifically. As of now i couldn't find any TWRP or any Custom ROM to flash and fix those things or ROOT or at least try to.
Please hit me up if any development comes for the same.
[ THIS IS A TUTORIAL TO BRING BACK THE TAB TO YOUR OLD STATE ]
Now on to the steps to fix :
STEPS :
1. Lock bootloader by going to download mode (turn off the device, press both vol keys and connect USB untill the blue screen (download mode) pops up), then follow the menu.
2. Flash stock Firmware. After booting setup as usual and that's it. You should be back to your original state.
3. Force reboot to stock recovery and format data/erase data after flashing stock firware. (this setp is IMP if the step 1&2 didn't work alone)
Enjoy YogiJi's Smile FACE
LINKS :
Firmware [ SM-T225_INS_T225XXU1AUI3 ]
ODIN
Samsung Drivers