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Heres a list of all original stock ROM firmware package for LG Optimus GT540 also known as LG GT540 Swift, LG Loop GT540.  The firmware below were arrange according to their designated region/countries origin.
Note: the LG Optimus GT540 Original stock release is Android OS, v1.6 (Donut), and it is upgradable to froyo and gingerbread.


Firmware version list according to region or countries

GT540
ALGERIA, IRAQ
DZ_GT540AT-00-V10b-IRQ-XX-JUL-08-2010

AUSTRALIA
DZ_GT540AT-00-V20d-505-XX-DEC-08-2010

BALTIC REGION
DZ_GT540AT-00-V20d-BAL-XXX-DEC-02-2010

BH TELECOM BOSNIA
DZ_GT540AT-00-V10d-APP-XX-JUN-30-2010+0

BOUYGUES FRANCE
DZ_GT540AT-00-V20c-BYT-FR-FEB-09-2011

BELGIUM, CZECH, NETHERLANDS
DZ_GT540AT-00-V20b-EUR-XX-DEC-16-2010+0

BTC BULGARIA
DZ_GT540AT-00-V20b-284-03-DEC-15-2010+0

CHINA
GT540AT-00-V10c-OPEN-CHN-MAY-28-2010+0_DZ

CIS REGION
DZ_GT540AT-00-V20d-CIS-XXX-DEC-02-2010

ERA POLAND
DZ_GT540AT-00-V20a-260-02-DEC-09-2010+0

EIRCOM IRELAND, METEOR IRELAND
DZ_GT540AT-00-V20a-272-03-DEC-13-2010+0

ERONET BOSNIA
DZ_GT540AT-01-V10e-218-03-MAY-20-2010+0

EURO OPEN, GREECE, HUNGARY, M-TEL BULGARIA, PANNON HUNGARY, TELE2 CROATIA
DZ_GT540AT-00-V20b-APP-XX-DEC-10-2010+0

FRANCE
DZ_GT540AT-00-V20c-208-XX-FEB-15-2011+0

GERMANY
DZ_GT540AT-00-V20a-262-XX-DEC-08-2010+0

HONG KONG
DZ_GT540AT-00-V20a-HKG-XX-DEC-06-2010+0

INDIA
DZ_GT540AT-00-V20c-IND-XX-DEC-03-2010

ITALY
DZ_GT540AT-00-V20b-222-XX-DEC-15-2010+0

MOROCCO
DZ_GT540AT-00-V10b-MOR-XX-JUN-11-2010

NRJ FRANCE
DZ_GT540AT-00-V20a-208-01-NRJ-JAN-13-2011+0

OPTUS AUSTRALIA
DZ_GT540AT-00-V20d-505-02-DEC-01-2010

OPTIMUS PORTUGAL
DZ_GT540AT-01-V10b-268-03-MAY-12-2010

O2 UK
DZ_GT540AT-00-V20b-234-10-DEC-08-2010+0

O2 IRELAND
DZ_GT540AT-00-V20a-272-02-DEC-05-2010+0

ORANGE FRANCE
DZ_GT540AT-00-V20b-ORF-FR-DEC-03-2010

ORANGE ROMANIA
DZ_GT540AT-00-V10d-EUR-XX-MAY-31-2010+0

ORANGE UK
DZ_GT540AT-00-V20b-ORU-GB-DEC-03-2010

ORANGE POLAND
DZ_GT540AT-00-V20b-ORP-PL-DEC-03-2010

ORANGE SLOVAKIA
DZ_GT540AT-00-V20b-ORS-SK-DEC-03-2010

PCC HONG KONG
DZ_GT540AT-00-V20a-454-19-OCT-01-2010+0

PORTUGAL
DZ_GT540AT-00-V20b-268-XX-DEC-16-2010+0

POLAND
DZ_GT540AT-00-V20c-APP-XX-MAR-14-2011+0

PLUS POLAND
DZ_GT540AT-00-V20a-260-01-DEC-08-2010+0

P4 POLAND
DZ_GT540AT-00-V20a-260-06-DEC-08-2010+0

ROMANIA
DZ_GT540AT-00-V20b-226-XX-DEC-15-2010+0

RUSSIA
DZ_GT540AT-00-V20d-RUS-XXX-DEC-02-2010

SFR FRANCE
DZ_GT540AT-00-V20b-SFR-FR-DEC-03-2010

SINGAPORE, PHILIPPINES, VIET NAM, THAILAND
DZ_GT540AT-00-V20c-XXX-XX-DEC-03-2010

SOUTH AFRICA
DZ_GT540AT-00-V20a-AFR-XX-OCT-19-2010

STARHUB SINGAPORE
DZ_GT540AT-00-V20b-525-05-OCT-12-2010

SWITZERLAND
DZ_GT540AT-00-V20b-EUZ-XX-DEC-08-2010+0

SLOVENIA
DZ_GT540AT-00-V20c-293-XX-DEC-07-2010+0

SPAIN
DZ_GT540AT-00-V20c-EUR-XX-APR-07-2011+0

TAIWAN MOBILE TAIWAN
DZ_GT540AT-00-V20a-466-97-DEC-16-2010+0

TAIWAN
DZ_GT540AT-00-V20b-TWN-XX-DEC-16-2010+0

TURKEY
DZ_GT540AT-00-V10b-286-XX-JUL-28-2010

T-MOBILE HUNGARY
DZ_GT540AT-00-V20b-216-30-DEC-30-2010+0

T-MOBILE SLOVAKIA
DZ_GT540AT-00-V20b-231-02-DEC-15-2010+0

TMN PORTUGAL
DZ_GT540AT-01-V20b-268-06-DEC-09-2010+0

TESCO UK
DZ_GT540AT-00-V20c-234-10-TSC-DEC-04-2010+0

TELEKOM SERBIA
DZ_GT540AT-00-V20a-220-03-JAN-07-2011+0

UAE
DZ_GT540AT-00-V10c-ARB-XX-SEP-02-2010

VIP CROATIA
DZ_GT540AT-01-V10b-219-10-MAY-21-2010

VODACOM SOUTH AFRICA
DZ_GT540AT-00-V10a-655-01-JUL-21-2010

VODAFONE GERMANY
DZ_GT540AT-00-V20a-VD2-DE-JAN-07-2011

UNITED KINGDOM
DZ_GT540AT-00-V20c-234-XX-DEC-09-2010+0

VIRGIN FRANCE
DZ_GT540AT-00-V20a-208-01-VMF-DEC-16-2010+0

VODAFONE AUSTRALIA
DZ_GT540AT-01-V20c-505-03-DEC-01-2010

VODAFONE NEWZEALAND
DZ_GT540AT-00-V20d-530-01-DEC-01-2010

VODAFONE UK
DZ_GT540AT-00-V20c-VDF-GB-DEC-15-2010+0

YOIGO SPAIN
DZ_GT540AT-01-V10b-214-04-MAY-26-2010


GT540f
TELSTRA AUSTRALIA
DZ_GT540fAT-00-V20a-TEL-AU-DEC-09-2010
TELCEL MEXICO
DZ_GT540fAT-00-V10a-TCL-MX-JUN-11-2010+7
CLARO BRAZIL
DZ_GT540fAT-00-V20a-CLR-BR-OCT-20-2010+1
VIVO BRAZIL
DZ_GT540fAT-00-V20a-VIV-BR-OCT-20-2010+1
3 AUSTRALIA
DZ_GT540fAT-01-V20d-505-06-DEC-08-2010


GT540g
CLARO CENTRAL AMERICA
GT540gAT-00-V10a-CAO-XXX-JUL-29-2010+2
TIGO CENTRAL AMERICA
GT540gAT-00-V10a-TGO-XXX-JUL-30-2010+3
CLARO CHILE
DZ_GT540gAT-00-V10a-730-03-JUL-29-2010+1
COSTA RICA
GT540gAT-00-V10a-712-XXX-SEP-24-2010+2
PERSONAL ARGENTINA
GT540gAT-00-V20a-722-34-DEC-28-2010+0
CLARO PERU
GT540gAT-00-V10a-716-10-SEP-28-2010+1
CLM PANAMA
DZ_GT540gAT-00-V10a-714-03-AUG-12-2010+1
PORTA ECUADOR
DZ_GT540gAT-00-V10a-740-01-JUL-30-2010+3
TELEFONICA ARGENTINA, TELEFONICA VENEZUELA
GT540gAT-00-V20a-SSV-XXX-JAN-28-2011+0


GT540GO
OPTUS AUSTRALIA
DZ_GT540GOAT-01-V20a-505-02-DEC-07-2010
VODAFONE NETHERLANDS
DZ_GT540GOAT-00-V20a-204-04-MAR-24-2011+0


GT540R
ROGERS CANANDA
DZ_GT540RAT-00-V20a-RGS-CA-DEC-11-2010


LG Optimus GT540  Firmware Update Procedure:

 " Proceed at your own risk, we are not liable and take no responsibility how you use these files"

1. Downlaod LGDP2 V36 UMTS Setup and extract, go to LGDP2_31_INCLUDE_LGDP1_Setup folder and install the exe (use serial number). Now copy all the files from DOWNLOAD folder and paste on C:DOWNLOAD (overwrite if needed).
2. Install LG United Modem Driver, connect the phone to PC through USB cable and let the drivers to be installed.
3. Youll need firmware in DZ format and the correct DLL for your model.
4. Open LGDP2_V36_UMTS from C:DOWNLOAD, select UMTS in Division and click OK.
5. Select port (check Device Manager for LG USBModem Port number), you can set a range from easy select or select manually. Select DLL and select firmware in Downlaod Configuration. Click OK.
6. Click START in main window and connect the phone to USB cable in Emergency download mode(VOL-DOWN+PWR).


Biggest thanks to nasirahmed @XDA for sharing all of this files..

Google released the Nexus 4, this time collaborating with LG with latest OS Android 4.2 Jelly Bean. Google Android version is still named as Jelly Bean, indicates nothing too much new features in this version. This was against with previous rumors claimed that Googles Android version 4.2 will be named as the Key Lime Pie. If the Samsung Galaxy Nexus using full body plastic, the LG Nexus 4 looks and feels more premium. From the front, the screen is slightly convex at the tip, like the Nokia Lumia 800. From the side, there is a dark blue plastic thin bezel, thereafter no matte metallic materials such as rubber which helps grip when holding the phone.

This smartphone is equipped with a screen measuring 4.7-inch WXGA IPS True HD Plus with a resolution of 1280 x 768. equipped with the top class latest hardware system, call Snapdragon S4 Krait quadcore processor 1.5 GHz, Adreno 320 GPU and 2GB of RAM. Other specifications are also not lose,  like the Gorilla Glass 2 front and rear, an 8MP camera with LED flash and 1080p video recording, 16GB of storage, NFC, and reinforced large capacity 2100mAh battery.

Nexus device interface completely pure default Google Android 4.2 Jelly Bean is now more and more embedded features. For example lockscreen, there are three pages, the default lockscreen, then you could add some widgets in lockscreen pages left, which is available is calendar, digital clock, Gmail, Google+ and SMS. Meanwhile, if you sweep to the right page, you will be taken straight to the camera app. For access to Google Now still present but split with padlock lockscreen, this time appearing at the bottom. In addition to regular lockscreen, there are other models such as the lockscreen pattern, pin, password and Face Unlock.

Nexus 4 only supports a GSM / HSPA +. Currently, there is no model that supports 4G. Reportedly, this device is not going to support the super fast connections. There are two capacities Nexus 4 is sold by Google, the 8GB and 16GB. Unlocked version (not under contract with operator) Nexus 4 8GB is priced at 299 U.S. dollars, while the 16GB version will be priced at 349 U.S. dollars.