[T-Mobile LG G2x] :
Follow this.....

Nvidia NvFlash APX Driver

•	Unlike a lot of Android phones out there the Nvidia Tegra2 chipset require additional drivers in Windows to support low level flashing.

Install APX Windows driver from APX folder.

(Windows x86 and x64 O/S Drivers):

****If you are running VmWare kill it.****

1.	Remove the battery.

2.	Plug in your USB cable to your PC.

3.	Hold Volume Up and Volume Down at the same time keeping them held down.

4.	Plug in the USB cable to your phone. (Keep the buttons held until Windows detects a new APX device.)

5.	Open Device Manager in Windows and you should see "APX Device" listed with an error icon.

6.	Right click on the APX device.

7.	Select 'Update driver software'.

8.	Select 'Browse my computer...'.

9.	Select 'Let me pick...'.

10.	Select 'Have disk'.

11.	Browse to directory you extracted the *driver* software to: One-Click-G2x-recovery-flasher-09-04\APX.

12.	Accept any warnings, including the big red alert (you may need to disable UAC).

13.	Now in Device Manager under 'USB Controllers' you should have an 'NVIDIA USB Boot-recovery driver for mobile devices'.

14.	If not, uninstall the driver, reboot, rinse and repeat.

Flash ClockworkMod Recovery

1.	Remove the battery.

2.	Goto NvFlash directory and Double Click "OneClickRecoveryFlasher.exe".

3.	Make sure the USB cable is unplugged from your phone.

4.	Hold Volume Up and Volume Down at the same time keeping them held down. (Keep them held until you see the "S/W Upgrade" screen on your phone after you complete step7!).

5.	Plug in the USB cable to your phone.

6.	Click the "Flash ClockworkMod" button. This is CWM version 4.0.2.0.

7.	You should see it send a bunch of files to the device and the phone screen should say "S/W Upgrade - Please wait while upgrading...". Once the files are sent and the program is finished running in the command window, you can just pull the USB cord while it still says "S/W Upgrade - Please wait while upgrading...".

8.	Put the battery back in and you can now boot into Recovery. (see below..)

Booting into ClockworkMod Recovery

1.	Power off your phone.

2.	Hold Vol Down + Power.

3.	Keep holding them, as soon as you see a "Blue LG Graphic" logo let go of the buttons.

Restore LG G2x Stock Recovery

•	Flash Stock recovery only when you want to send your phone in to T-Mobile. Otherwise do not flash Stock recovery. Stay on ClockworkMod Recovery.

1.	Remove the battery.

2.	Goto NvFlash directory and Double Click "OneClickRecoveryFlasher.exe".

3.	Make sure the USB cable is unplugged from your phone.

4.	Hold Volume Up and Volume Down at the same time keeping them held down. (Keep them held until you see the "S/W Upgrade" screen on your phone after you complete step7!).

5.	Plug in the USB cable to your phone.

6.	Click the "Flash Stock" button.

7.	You should see it send a bunch of files to the device and the phone screen should say "S/W Upgrade - Please wait while upgrading...". Once the files are sent and the program is finished running in the command window, you can just pull the USB cord while it still says "S/W Upgrade - Please wait while upgrading...".

8.	Put the battery back and you are done.

Then.. get the MIUI ROM from here...

http://db.communityrelease.com/developer_display.asp?developerid=469#625

but.. I've tried it and its very buggy... I prefer Weapon G2x 2.5, Release 2.5 which is in the same link...good luck