[T-Mobile LG G2x] Core Memory:
The following instructions are to be used to determine if your cell phone's transmit and receive functions are working when your phone doesn't successfully make phone calls. In the instructions, I've included backing up your phone's NV memory settings in case you inadvertently change the phone's settings or brick your phone (assuming the phone wasn't already bricked).

1) Download QPST

http://hosting.ecap-droid.com/Droid/...pub=bxfo8sfkv6

2) Install QPST (set it to run as Administrator and pin it to the Start Menu)

3) Download and install QXDM (set it to run as Administrator and pin it to the Start Menu)

http://www.mediafire.com/?tmzmngemgmm

4) Download LG Drivers

http://www.lg.com/us/support-mobile/lg-P999

5) Install LG Drivers

6) In the phone’s Settings -> Applications -> Development -> enable USB debugging

7) Access the phone's hidden menu using the phone keypad (dialer), enter: 1809#*999#

8) In Port Setting enable CP USB (do not enable Retain ...) then press: OK

9) Plug your phone into the USB port and wait a few seconds until the USB drivers install.

10) Access the LGE Mobile USB Modem driver through Control Panel -> Device Manager -> LGE Mobile USB Modem -> Advanced -> Advanced Port Settings

11) Click on the box next to “Append to Log” so that a checkmark is in that box.

12) Click on: Query Modem

The window above “Query Modem” should fill up with (the following data is from my phone, your phone’s Revision may be and IMEI will be somewhat different):

“ATQ0V1E0 - OK

AT+GMM - 0

AT+FCLASS=? - +FCLASS: (0-1)

AT#CLS=? - COMMAND NOT SUPPORTED

AT+GCI? - COMMAND NOT SUPPORTED

AT+GCI=? - COMMAND NOT SUPPORTED

ATI1 - Manufacturer: QUALCOMM INCORPORATED

Model: 0

Revision: M6600A-SCAUTNZ-2.0.9720T 1 [MAR 11 2012 10:00:00] MP:TRULGE_08.09.02R_MDM

IMEI: 0127XXXXXXXXXXXXXXX (I’ve X’d out my IMEI for security reasons)

+GCAP: +CGSM,+DS,+ES

ETC…”

If that doesn’t happen, then the Port Setting has probably reverted back to “AP USB” and will need to be changed back to “CP USB” or the LG drivers didn't install fully or correctly or the computer's usb connection or the usb cable has a problem. Check the phone’s screen and see if the Port Setting is still at “CP USB”. If it’s not (back on “AP USB”) redo step 8. If the setting is still at "CP USB" then reinstall the LG drivers. If there's still a problem, it may be the computer's USB port or the USB cable.

13) Click on: View log

The phone’s current IMEI and other information is listed in the information.

14) In the terminal port setting, get the LGE Mobile USB Modem COM Port number by accessing the USB driver through Control Panel -> Device Manager -> LGE Mobile USB Modem -> Advanced -> Advanced Port Settings -> COM Port Number

Write down the port number.

15) Close the LGE Mobile USB Modem Properties window.

QPST

16) Run QPST Configuration from QPST folder in the Start Menu

17) In QPST Configuration, click on: Ports tab

18) In Ports window, click on the Port which has the phone listed as FFA-QSC6295 (DEAD00D) with the USB Link

19) Write down the COM port number with USB Link. For example: COM44 = 44 It should match the COM Port Number you previously wrote down in step 13.

20) In QPST Configuration, click on: Phone tab

21) In Active Phones window, click on the phone listed as FFA-QSC6295 DEAD00D ZRF6500 with the same COM port as you wrote down previously

22) In the QPST Configuration menu, click on: Start Clients, and click on: Software Download

23) In QPST Software Download, click on the: Backup tab

24) A dialog box should appear with the same COM port number as you selected previously and there should be a name for the QCN File which has the ESN number in it (DEAD00D_1.qcn) and an SPC (Service Programming Code) number of 000000

25) If you want to, add information to the QCN File name to make it more explanatory. For example:

DEAD00D_1_My_Phone_NV_Backup.qcn

26) Browse to a location you want to save the QCN backup file to

27)Click on: Start

28) Run RF NV Manager from the QPST folder in the Start Menu

29) In the RF NV Manager menu, click on: Setting, and click on: Comport

30) In the Comport Configuration dialog box, click on the arrow in the selection window and select the port number you wrote down from step and click on: OK

31) In the RF NV Manager menu, click on: File, and click on: Read From Phone

32) The RF NV Manager window should fill up with the NV items from your phone.

33) In the QPST Configuration Window, Click on: Start Clients

34) Select: Service Programming

35) In the QPST Service Progamming Client window, click on the tab: Settings

36) Click on: Read from Phone

37) In the Codes section, Service Programming should show: 000000

38) In the QPST Service Progamming Client window, click on the tab: UMTS System

39) Click on: Read from Phone

The phones radio band settings and other information should appear with checkmarks next to the bands enabled for the phone's cell radio chip. Even though a radio band is selected, it doesn't necessarily mean that the radio band will work because either the circuitry in the phone isn't connected to a particular radio band's port on the cell radio chip and/or the cell radio band's setup/operating parameters aren't in the phone's cell radio chip firmware. Selecting any/all of them and writing that to the phone will change the phone's cell radio band's settings and, even though bands which won't work are selected, that won't harm the phone (I have all of them selected).

QXDM Professional

40) Start QXDM Professional

41) Click on: Communications

In the Communications dialog box, in Target Port, select the COM port which you wrote down previously (the one that QPST is connected to).

42) Click on: OK

The window should now become active.

43) In the View drop down menu, select: Status (Static) <F9>

The window should fill with information about your phone.

44) In the View drop down menu, select: UMTS Cell Reselection

The window should change and various coloured lines with dots on them should appear which indicates that the phone is communicating with cell towers. If there's no activity, it means that the phone's cell radio is either not working/burnt out, faulty SIM card, or something is preventing the phone from communicating with the cell towers, or something else.

45) In the View drop down menu, select: WCDMA Power

The window should fill with a graph for Receive (RX) and Transmit (TX) power. At the bottom is a blue graph of the phone's received power. If you don't see the blue graph, it probably means that your phone's antenna isn't connected or the phone's cell radio chip is not working/burnt out, or something between the chip and the antenna isn't working. Make a phone call and, near the top at -0-, you should see a green graph of the phone's transmission power. If the green graph doesn't appear, it probably means that your phone's cell radio chip transmit section isn't working/burnt out. If the green graph does appear but your phone isn't able to successfully phone, something else is wrong such as the phone's antenna is disconnected or something is wrong between the cell radio chip and the antenna, or a faulty SIM card or something else.

46) If finished, exit all QXDM, QPST, set your phone's Port Setting to AP USB, disconnect the USB cable, reboot your phone.