[Q] How Do I Get My MSL for the Galaxy S II Version 4.1.2 under sprint topic

Now before you guys say research and look for the answers I have literally searched this for 3 days and tried too many different methods, i have even tried to downgrade my phone back to 4.1.1 like 4 times and now i can no longer even get back to the download menu by pressing volume down and power button.

I have even tried install zip files from the SD card to downgrade, and finding the 4.1.1 downgrade wasn't easy, nor finding any other downgrade.

Is there a new effective and guaranteed working solution to getting my MSL on the 4.1.2 version.

I have the Sprint Samsung Galaxy SII model number SPH-D710 jellybean version 4.1.2