[GT540 Optimus Android Development] mejack03:
Copied from other thread :)

this includes:

preparing your pc

preparing your phone

installing your rom + installing clockworkmod recovery

download links

UPGRADE

1.backup anything on the phone itself

2.download the updater package and extract to your desktop

3.run LG Driver.exe and install

4.on phone go to settings>applications>development and tick usb debugging

5.right click on windows enabler.exe and click run as administrator

5.do the same for KDZ_FW_UPD.exe

6.at the bottom right of your pc screen click on the windows enabler icon so it will say "on"

7.on the KDZ click the dropdown box at the top and it will enable, then click again and select 3GQCT

8.leave the next one. click the browse button to enable then click the folder icon next to it and find your .kdz file

9.plug in your phone but dont mount sd card

10.click the button under browse to start installing.i suggest that you close all other windows except this and stop any antivirus scans that slow your pc down

11.wait until your phone restarts completely and the lock screen comes up, now you can unplug your phone.

links:

updater package ht*p://www.mediafire.com/?sdy95t16nex2yeo

2.1 original rom ht*p://www.mediafire.com/?y7q20212djy40ap

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That was for android 2.1 with fastboot, if you just want the upgrade to 2.1 then your done.

If not, the next step is to get clockwork recovery

Clockwork Recovery v 2.5.0.5

1.repeat steps 5-11 of UPGRADE with Clockwork recovery rom.kdz file

2.once the Clockwork recovery rom.kdz file has been installed switch off your phone

3.download android sdk off android developers website and extract into your C drive

4.then right-click on My Computer, and select Properties. Under the Advanced tab, hit the Environment Variables button, and in the dialog that comes up, double-click on Path (in System Variables box). Add C:\<androidsdk>\tools\; directory to the path.

5.get your phone and if its on turn it off. hold power button and camera button until the lg logo goes and screen is black

6.plug your phone into your pc while its on the black screen and open cmd

7.download recovery.img and place in C drive

8.in cmd type: fastboot.exe flash recovery C:\recovery.img then press enter. it should say OKAY twice. reply if there is a problem

9.unplug and take out battery then place it back in

links:

Clockwork recovery rom ht*p://www.mediafire.com/?4r5n1cj5v49151p

recover.img ht*p://www.mediafire.com/?zak0q95fgemo8mp

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if you want to have clockwork with original 2.1 rom then repeat steps 5-11 from UPGRADE with the first .kdz file

if you want the black quarx 2.1 then carry on reading.

Black Quarx ROM

1.get your phone and if its on turn it off. hold power button and camera button until the lg logo goes and screen is black

2.download black system.7z and extract to your desktop

3.and run flash.cmd as administrator then plug in your phone whilst its screen is black.

4.it should start executing commands.if it still says "waiting for device" then post a reply.

5.the phone will automatically reboot when finished. it may take long to reboot but its not like that normally, its just got a lot to load.

links:

ht*p://rghost.net/2898235

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how to use clockworks recovery

when phone is off, press and hold power and home button to switch on in clockworks recovery mode.

to scroll up or down use volume buttons.

to select press call button.

to cancel or go back press end call button.

Once you done.. u will be having Fastboot+clockworkmod recovery+2.1 ROM

if u want to upgrade to 2.2 download the file from this link

http://openswift.googlecode.com/files/Openswift_4.3.7z (install in fastboot )

http://dump.ru/file/4990177 (install in recovery)

use any one of the above method and enjoyy froyo..!!!