First download
3024.prl
I found out through massive trial and error with qpst and lgnpst that the VS740.dll will work to use to update your PRL i dont know if u can use it for any other features. I tried the VS910.dll but it never worked, never could get it to register could have been a bad file either way the VS740.dll is included with lgnpst in the following guide and it works!
Next follow this guide word for word and you should have no problems updating your PRL. Only after you do step 15 STOP FOLLOWING THE GUIDE! THIS IS VERY IMPORTANT THE FOLLOWING GUIDE IS TO RESTORE A COMPLETELY DIFFERENT PHONE!
http://androidforums.com/ally-all-things-root/263674-guide-lgnpst-alternate-v6-restore-method-updated-5-24-11-a.html#post2177011
Select the prl tab its right next to where it says script.
Make sure write is selected then click prl file, select nam1 and nam2.
Then to the right is a little icon that looks like a folder; click it and select the prl file you downloaded in the beginning.
Finally click start. Enter your spc code. use the converter here
MEID Converter - Free MEID and ESN conversion tool type your imei number(its in the settings menu > about phone > status) then click convert and it will show your metropcs SPC number. Type that in the box and hit enter. Let it do its thing and you should be good to go.
I tried everything in all the other threads and it just would not work until i did it this way. I havent dropped out of 4g service since the update!
PS: non-related but using the usb port to charge this phone is a waste of time gotta use the wall adapter that came with the phone or it'll never charge!