Whatever I see in software wont help.. Yeah mm kay so how come I get 4G signal on a spot where I normally dont have a 4G signal? And how come others have succeded with the same thing on Band 8 where they normally dont have LTE reception?
You are so full of preconceptions and using your own facts without any proof which I can deliver.
If you would peek through NON-HLOS.bin, you will see that there are files for band 8 in there so thats a non issue, however files (calibration data) are missing for band 20 in here thus thats why we wont get signal on band 20 (YET)
There has been other attempts at this on other phones with success and if you are the slighest interested in educating yourself then you can scour through the growing xda thread which links to other posts.
http://forum.xda-developers.com/mi-5/how-to/progress-trying-to-unlock-bands-t3337476