[GUIDE] How to change your PRL while using CM7

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YES YOU READ THAT CORRECTLY

First off, huge props to Bierce and Oostah for all the searching and then providing me the info on how we might be able to enter DIAG mode on your phone while on CM7. All I did was manage to get it to work, and taking a leap of faith by trying to change my prl while using CM7

Something we never thought was possible...

Second, this isn't exactly for the faint of heart. QPST can really mess up your phone if you don't know what you're doing (read as: venture off and mess around with the program). Also, since I literally just did this this evening, there obviously hasn't been extensive testing with it. So "continue at your own risk".
Personally I haven't had issues with it and I've changed my PRL about 5 times to make sure it works. But still, it goes without saying: I'm not responsible if your phone gets FUBAR

What you'll need:
MSL -> (msl reader app)
Diagnostic Drivers (htc) -> google it for now, but I think these are the correct ones you need LINK
QPST -> Get the latest version here

1. install QPST
2. Get your MSL
3. Install the Htc Diagnostic Drivers (if needed)
4. Connect your phone to your PC
5. Open 'Terminal Emulator' on your phone and enter the following:
   

   echo 1 > /dev/qct_diag_enable

   This enables Diagnostics Mode, which enables us to use QPST
   
6. Open QPST Configuration
7. Select the "Ports" tab
8. Click "Add New Port"
9. Uncheck "Show Serial and USB/QC Diagnostic ports only"
   
10. Click on your device and hit OK
11. Highlight your phone on the "Ports" tab
12. Open up the "Start Clients" menu
13. Click on "Service Programming"
    
14. QPST Service Programming will open up and a "Phone Selection" window will appear: Click your phone if needed, and press OK
    
15. Now select the "Roam" tab and click on "Read from Phone" button
16. Enter your MSL, OK
    
17. Click on the "Browse" button and select the PRL file you want on your phone
18. Click the "Write to Phone" button next to the "read phone" button
    
19. Wait for it to finish writing to the phone. You might (read as most likely) get an error box, click OK on it.
    
20. Once all that is done, you can reboot your phone and enjoy the changed PRL without nandroiding, nand-restoring/flashing, etc. etc.

I just want to mention that the first time I did it, I lost my Mobile Data connection (3g) and after a reboot it was stuck on 1x. After another reboot, it was back to normal. But I believe that it was because I tried a verizon PRL that drops my service to almost 0.

End results

Yes, I know the status bars are 2 different colors. I have the Orion theme on my SDcard at the moment so it takes a little while to load up. But I assure you its the exact same CM7 rom and everything.

edit: oops double post >_<

ha you beet me to this kyouko great guide man. if yall are having trouble getting diag drivers to install please use this guide.

http://forum.xda-developers.com/showthread.php?t=114087

and the te method will work on all aosp roms.

thank you. works like a champ.
running cm7 nightly 129 heroc

Nice work man glade to see this working.

Sent from my HERO200 using XDA Premium App

Kyouko > heroc
Kyouko ~ shooter

BANG! from my shooter...

Originally Posted by il Duce

Kyouko > heroc
Kyouko ~ shooter

BANG! from my shooter...

I'm still waiting on the Within (SGSII) to get released for sprint. I wanna check that out before I get an upgrade. Either way, probably wont get a new phone till fall :/

Sent from my HERO200 using XDA App

Originally Posted by kyouko

I'm still waiting on the Within (SGSII) to get released for sprint. I wanna check that out before I get an upgrade. Either way, probably wont get a new phone till fall :/

Sent from my HERO200 using XDA App

NICE JOB man i found the same thing was coming to tell you about the

echo 1 > /dev/qct_diag_enable

and to disable it

echo 0 > /dev/qct_diag_disable

it may be echo 1 then > /dev/qct_diag_disable
i will test then edit post

it would be:

echo 1 > /dev/qct_diag_enable
echo 0 > /dev/qct_diag_enable

to turn diag mode on and off, respectively

/dev/qct_diag_disable doesn't exist

You can check that with terminal emulator...

su
cd /dev/
ls

Thought I'd mention that I've used this method easily more than 20 times between my phone and another hero with ZERO problems.

I know in the OP it might sound a little scary, the warning is mostly for screwing around with QPST in the areas not talked about.

Sent from my Hero using Tapatalk