Here is a guide (borrowed from the Ascend threads) on how to update the PRL on the Huawei M835
On Phone Dial this code
A menu will pop up
Go to projectmenu -- Background Settings -- USB Port -- (select) Manufacture mode
Go to www.checkesnfree.com
to get your SPC code with your MEID number from under the battery.
Make sure on Phone USB Debugging is on
Now On Windows go to device manager -- ports and look for DBAdapter Reserved Interface
(Remember your COM PORT)
Run QPST Configuration (located in startmenu -- all programs -- QPST)
Add new port (Add COM port from Device Manager DBADAPTER Interface) ..
Then Go to start client -- service programming
On Service Programming
Go to tab roam
Look for preferred roaming (Browse for the 3022.prl file given )
click read from phone ......
when asked for code enter the MetroPCS SPC number
Then Hit Write To Phone
If Successfull Phone Will Reboot (You will Have 3G icon If in Coverage Areas)