[Galaxy S III General] rizdroid:
Hi there -

A list of

126 official fw

I was able to find on Samsung server so far follows. All of them can be downloaded directly from Samsung FUS via Check Fus using the info provided, I mean, the three-letter PCODE and HIDSWVER.

Cheers!

Afghanistan ....... Unbranded ......... »» AFG »» I9300XXALE9/I9300OJVALE9/I9300XXLE8/I9300XXALE9
Algeria ........... Unbranded ......... »» TMC »» I9300XXALE9/I9300OJVALE9/I9300XXLE8/I9300XXALE9
Argentina ......... Claro ............. »» CTI »» I9300UBALE6/I9300UVCALE4/I9300UBLE6/I9300UBALE6
Argentina ......... Movistar .......... »» UFN »» I9300UBALE6/I9300TFGALE4/I9300UBLE6/I9300UBALE6
Argentina ......... Personal .......... »» PSN »» I9300UBALE6/I9300PSNALE4/I9300UBLE6/I9300UBALE6
Argentina ......... Unbranded ......... »» ARO »» I9300UBALE6/I9300UVOALE4/I9300UBLE6/I9300UBALE6
Australia ......... Optus ............. »» OPS »» I9300XXALE8/I9300OPSALE4/I9300XXLE8/I9300XXALE8
Australia ......... Unbranded ......... »» XSA »» I9300XXALE8/I9300XSAALE6/I9300XXLE8/I9300XXALE8
Austria ........... A1 ................ »» MOB »» I9300BUALE6/I9300VFGALE6/I9300BULE6/I9300BUALE6
Austria ........... Orange ............ »» ONE »» I9300BVALE4/I9300ONEALE4/I9300BVLE4/I9300BVALE4
Austria ........... Three ............. »» DRE »» I9300XXALE8/I9300DREALE2/I9300NELE4/I9300XXALE8
Austria ........... T-Mobile .......... »» MAX »» I9300XXALE8/I9300MAXLE3/I9300BOLE5/I9300XXALE8
Austria ........... Unbranded ......... »» ATO »» I9300XXALE8/I9300ATOALE3/I9300XXLE8/I9300XXALE8
Bangladesh ........ Unbranded ......... »» TML »» I9300XXALEF/I9300ODDALE7/I9300DDLE9/I9300XXALEF
Brazil ............ Tim ............... »» ZTM »» I9300UBALE6/I9300ZTMALE6/I9300UBLE6/I9300UBALE6
Brazil ............ Unbranded ......... »» ZTO »» I9300UBALE6/I9300ZTOALE7/I9300UBLE6/I9300UBALE6
Brazil ............ Vivo .............. »» ZVV »» I9300UBALE6/I9300ZVVALE6/I9300UBLE6/I9300UBALE6
Caribbean ......... Digicel-Profile ... »» JDI »» I9300UBALE6/I9300JDIALE4/I9300UBLE6/I9300UBALE6
Chile ............. Claro ............. »» CHL »» I9300UBALE6/I9300CHLALE4/I9300UBLE6/I9300UBALE6
Chile ............. Entel ............. »» CHE »» I9300UBALE6/I9300CHEALE4/I9300UBLE6/I9300UBALE6
Chile ............. Movistar .......... »» UFU »» I9300UBALE6/I9300TFGALE4/I9300UBLE6/I9300UBALE6
Chile ............. Unbranded ......... »» CHO »» I9300UBALE6/I9300CHOALE4/I9300UBLE6/I9300UBALE6
Colombia .......... Comcel ............ »» COM »» I9300UBALE6/I9300COMALE4/I9300UBLE6/I9300UBALE6
Colombia .......... Movistar .......... »» COB »» I9300UBALE6/I9300TFGALE4/I9300UBLE6/I9300UBALE6
Colombia .......... Unbranded ......... »» COL »» I9300UBALE6/I9300COLALE3/I9300UBLE6/I9300UBALE6
Croatia ........... T-Mobile .......... »» CRO »» I9300XXALE8/I9300CROLE3/I9300BOLE5/I9300XXALE8
Croatia ........... Vipnet ............ »» VIP »» I9300BUALE6/I9300VFGALE6/I9300BULE6/I9300BUALE6
Czech Republic .... O2 ................ »» O2C »» I9300XXALE8/I9300O2CALE4/I9300XXLE8/I9300XXALE8
Czech Republic .... T-Mobile .......... »» TMZ »» I9300XXALE8/I9300TMZLE3/I9300BOLE5/I9300XXALE8
Czech Republic .... Vodafone .......... »» VDC »» I9300BUALE6/I9300VFGALE6/I9300BULE6/I9300BUALE6
Denmark ........... Three ............. »» HTD »» I9300XXALE8/I9300HTDALE2/I9300NELE4/I9300XXALE8
Dominican Republic Claro ............. »» CDR »» I9300UBALE6/I9300UWAALE4/I9300UBLE6/I9300UBALE6
Dominican Republic Orange ............ »» DOR »» I9300UBALE6/I9300DORALE4/I9300UBLE6/I9300UBALE6
Ecuador ........... Claro ............. »» ECO »» I9300UBALE6/I9300ECOALE4/I9300UBLE6/I9300UBALE6
Ecuador ........... Movistar .......... »» EBE »» I9300UBALE6/I9300TFGALE4/I9300UBLE6/I9300UBALE6
Egypt ............. Unbranded ......... »» EGY »» I9300XXALE8/I9300OJVALE7/I9300XXLE8/I9300XXALE8
France ............ Bouygues Tel ...... »» BOG »» I9300XXALE8/I9300BOGALE2/I9300XXLE8/I9300XXALE8
France ............ Orange ............ »» FTM »» I9300BVALE4/I9300FTMALE4/I9300BVLE4/I9300BVALE4
France ............ SFR Mobile ........ »» SFR »» I9300BUALE6/I9300VFGALE6/I9300BULE6/I9300BUALE6
France ............ Unbranded ......... »» XEF »» I9300XXALE8/I9300OXXALE5/I9300XXLE8/I9300XXALE8
Germany ........... Debitel/Unbranded . »» DBT »» I9300XXALE8/I9300DBTALE5/I9300XXLE8/I9300XXALE8
Germany ........... O2 ................ »» VIA »» I9300XXALE8/I9300VIAALE4/I9300XXLE8/I9300XXALE8
Germany ........... T-Mobile .......... »» DTM »» I9300XXALE8/I9300DTMLE3/I9300BOLE5/I9300XXALE8
Germany ........... Vodafone .......... »» VD2 »» I9300BUALE6/I9300VFGALE6/I9300BULE6/I9300BUALE6
Greece ............ Unbranded ......... »» EUR »» I9300XXALE8/I9300EURALE1/I9300XXLE8/I9300XXALE8
Greece ............ Vodafone .......... »» VGR »» I9300BUALE6/I9300VFGALE6/I9300BULE6/I9300BUALE6
Guatemala ......... Claro ............. »» PGU »» I9300UBALE6/I9300UWEALE6/I9300UBLE6/I9300UBALE6
Hong Kong ......... Unbranded ......... »» TGY »» I9300ZSALED/I9300OZSALED/I9300XXLEF/I9300ZSALED
Hungary ........... Telenor ........... »» PAN »» I9300XXALE8/I9300OXFALE5/I9300XXLE8/I9300XXALE8
Hungary ........... Unbranded ......... »» XEH »» I9300XXALE8/I9300OXFALE5/I9300XXLE8/I9300XXALE8
India ............. Unbranded ......... »» INU »» I9300XXALE8/I9300ODDALE5/I9300DDLE8/I9300XXALE8
Indonesia ......... Unbranded ......... »» XSE »» I9300XXALE8/I9300OLBALE5/I9300DXLE8/I9300XXALE8
Iran .............. Unbranded ......... »» THR »» I9300XXALE9/I9300OJVALE9/I9300XXLE8/I9300XXALE9
Ireland ........... Three ............. »» 3IE »» I9300XXALE8/I93003IEALE3/I9300NELE4/I9300XXALE8
Ireland ........... Vodafone .......... »» VDI »» I9300BUALE6/I9300VFGALE6/I9300BULE6/I9300BUALE6
Italy ............. Tim ............... »» TIM »» I9300XXALE8/I9300TIMALE2/I9300XXLE8/I9300XXALE8
Italy ............. Tre ............... »» HUI »» I9300XXALE8/I9300HUIALE3/I9300NELE4/I9300XXALE8
Italy ............. Unbranded ......... »» ITV »» I9300XXALE8/I9300ITVALE7/I9300XXLE8/I9300XXALE8
Italy ............. Vodafone .......... »» OMN »» I9300BUALE6/I9300VFGALE6/I9300BULE6/I9300BUALE6
Kazakhstan ........ Unbranded ......... »» SKZ »» I9300XXALE8/I9300OXEALE1/I9300XXLE8/I9300XXALE8
Kenya ............. Safaricom ......... »» AFR »» I9300XXALE9/I9300OJVALE9/I9300XXLE8/I9300XXALE9
Kenya ............. Unbranded ......... »» KEN »» I9300XXALE9/I9300OJVALE9/I9300XXLE8/I9300XXALE9
Libya ............. Unbranded ......... »» BTC »» I9300XXALE9/I9300OJVALE9/I9300XXLE8/I9300XXALE9
Luxembourg ........ Unbranded ......... »» LUX »» I9300XXALE8/I9300LUXALE5/I9300XXLE8/I9300XXALE8
Macedonia ......... T-Mobile .......... »» MBM »» I9300XXALE8/I9300MBMLE3/I9300BOLE5/I9300XXALE8
Malaysia .......... Unbranded ......... »» XME »» I9300XXALE8/I9300OLBALE5/I9300DXLE8/I9300XXALE8
Mexico ............ Telcel ............ »» TCE »» I9300UBALE6/I9300TCEALE4/I9300UBLE6/I9300UBALE6
Morocco ........... Maroc Telecom ..... »» MAT »» I9300XXALE8/I9300OJVALE7/I9300XXLE8/I9300XXALE8
Morocco ........... Meditel ........... »» MED »» I9300XXALE8/I9300OJVALE7/I9300XXLE8/I9300XXALE8
Morocco ........... Unbranded ......... »» FWD »» I9300XXALE8/I9300OJVALE7/I9300XXLE8/I9300XXALE8
Nepal ............. Unbranded ......... »» NPL »» I9300XXALEF/I9300ODDALE7/I9300DDLE9/I9300XXALEF
Netherlands ....... T-Mobile .......... »» TNL »» I9300XXALE8/I9300TNLLE3/I9300BOLE5/I9300XXALE8
Netherlands ....... Unknown ........... »» PHN »» I9300XXALE8/I9300PHNALE4/I9300XXLE8/I9300XXALE8
Netherlands ....... Vodafone .......... »» VDF »» I9300BUALE6/I9300VFGALE6/I9300BULE6/I9300BUALE6
New Zealand ....... Vodafone .......... »» VNZ »» I9300XXALE8/I9300VNZALE4/I9300XXLE8/I9300XXALE8
Nigeria ........... Unbranded ......... »» ECT »» I9300XXALE9/I9300OJVALE9/I9300XXLE8/I9300XXALE9
Nordic Countries .. Unbranded ......... »» NEE »» I9300XXALE8/I9300NEEALE3/I9300XXLE8/I9300XXALE8
Norway ............ Telenor ........... »» TEN »» I9300XXALE8/I9300TENALE2/I9300XXLE8/I9300XXALE8
Pakistan .......... Unbranded ......... »» PAK »» I9300XXALE9/I9300OJVALE9/I9300XXLE8/I9300XXALE9
Panama ............ Claro ............. »» CPA »» I9300UBALE6/I9300UWEALE6/I9300UBLE6/I9300UBALE6
Panama ............ Movistar .......... »» PBS »» I9300UBALE6/I9300TFGALE4/I9300UBLE6/I9300UBALE6
Paraguay .......... Claro ............. »» CTP »» I9300UBALE6/I9300UVCALE4/I9300UBLE6/I9300UBALE6
Paraguay .......... Unbranded ......... »» UPO »» I9300UBALE6/I9300UVOALE4/I9300UBLE6/I9300UBALE6
Peru .............. Claro ............. »» PET »» I9300UBALE6/I9300PETALE4/I9300UBLE6/I9300UBALE6
Peru .............. Movistar .......... »» SAM »» I9300UBALE6/I9300TFGALE4/I9300UBLE6/I9300UBALE6
Poland ............ Orange ............ »» IDE »» I9300BVALE4/I9300IDEALE4/I9300BVLE4/I9300BVALE4
Poland ............ Unbranded ......... »» XEO »» I9300XXALE8/I9300OXFALE4/I9300XXLE8/I9300XXALE8
Portugal .......... TMN ............... »» TMN »» I9300XXALE8/I9300TMNALE5/I9300XXLE8/I9300XXALE8
Portugal .......... Unbranded ......... »» TPH »» I9300XXALE8/I9300TPHALE1/I9300XXLE8/I9300XXALE8
Portugal .......... Vodafone .......... »» TCL »» I9300BUALE6/I9300VFGALE6/I9300BULE6/I9300BUALE6
Puerto Rico ....... Claro ............. »» PCT »» I9300UBALE6/I9300UWAALE4/I9300UBLE6/I9300UBALE6
Romania ........... Orange ............ »» ORO »» I9300BVALE4/I9300OROALE4/I9300BVLE4/I9300BVALE4
Romania ........... Unbranded ......... »» COA »» I9300XXALE8/I9300OXFALE4/I9300XXLE8/I9300XXALE8
Romania ........... Vodafone .......... »» CNX »» I9300BUALE6/I9300VFGALE6/I9300BULE6/I9300BUALE6
Russia ............ Unbranded ......... »» SER »» I9300XXALE8/I9300OXEALE1/I9300XXLE8/I9300XXALE8
Singapore ......... SGP-MM1 ........... »» MM1 »» I9300XXALE8/I9300OLBALE5/I9300DXLE8/I9300XXALE8
Singapore ......... Sing Tel .......... »» SIN »» I9300XXALE8/I9300OLBALE5/I9300DXLE8/I9300XXALE8
Singapore ......... StarHub ........... »» STH »» I9300XXALE8/I9300OLBALE5/I9300DXLE8/I9300XXALE8
Singapore ......... Unbranded ......... »» XSP »» I9300XXALE8/I9300OLBALE5/I9300DXLE8/I9300XXALE8
Slovenia .......... Si.mobil .......... »» SIM »» I9300BUALE6/I9300VFGALE6/I9300BULE6/I9300BUALE6
South Africa ...... Unknown ........... »» XFE »» I9300XXALE8/I9300OJVALE7/I9300XXLE8/I9300XXALE8
South Africa ...... Vodacom ........... »» XFV »» I9300XXALE9/I9300OJVALE9/I9300XXLE8/I9300XXALE9
Spain ............. Movistar .......... »» XEC »» I9300XXALE8/I9300XECALE2/I9300XXLE8/I9300XXALE8
Spain ............. Orange ............ »» AMN »» I9300BVALE4/I9300AMNALE4/I9300BVLE4/I9300BVALE4
Spain ............. Unknown ........... »» PHE »» I9300XXALE8/I9300PHEALE3/I9300XXLE8/I9300XXALE8
Spain ............. Vodafone .......... »» ATL »» I9300BUALE6/I9300VFGALE6/I9300BULE6/I9300BUALE6
Sri Lanka ......... Unbranded ......... »» SLK »» I9300XXALEF/I9300ODDALE7/I9300DDLE9/I9300XXALEF
Sweden ............ Tre ............... »» HTS »» I9300XXALE8/I9300HTSALE2/I9300NELE4/I9300XXALE8
Switzerland ....... Swisscom .......... »» SWC »» I9300BUALE6/I9300VFGALE6/I9300BULE6/I9300BUALE6
Switzerland ....... Unbranded ......... »» AUT »» I9300XXALE8/I9300AUTALE3/I9300XXLE8/I9300XXALE8
Taiwan ............ Unbranded ......... »» BRI »» I9300ZSALED/I9300OZSALED/I9300XXLEF/I9300ZSALED
Thailand .......... Unbranded ......... »» THL »» I9300XXALE8/I9300OLBALE5/I9300DXLE8/I9300XXALE8
Trinidad & Tobago . Unbranded ......... »» TTT »» I9300UBALE6/I9300UUBALE6/I9300UBLE6/I9300UBALE6
Tunisia ........... Unbranded ......... »» TUN »» I9300XXALE9/I9300OJVALE9/I9300XXLE8/I9300XXALE9
Tunisia ........... Unknown ........... »» ABS »» I9300XXALE9/I9300OJVALE9/I9300XXLE8/I9300XXALE9
Turkey ............ Unbranded ......... »» TUR »» I9300XXALE8/I9300OJVALE7/I9300XXLE8/I9300XXALE8
U.Arab Emirates ... Unbranded ......... »» XSG »» I9300XXALE8/I9300OJVALE7/I9300XXLE8/I9300XXALE8
UK ................ BT Mobile ......... »» BTU »» I9300XXALE8/I9300OXAALE8/I9300XXLE8/I9300XXALE8
UK ................ O2 ................ »» O2U »» I9300XXALE8/I9300O2UALE5/I9300BWLE5/I9300XXALE8
UK ................ Orange ............ »» ORA »» I9300BVALE4/I9300ORAALE4/I9300BVLE4/I9300BVALE4
UK ................ Three ............. »» H3G »» I9300XXALE8/I9300H3GALE4/I9300NELE4/I9300XXALE8
UK ................ Vodafone .......... »» VOD »» I9300BUALE6/I9300VFGALE6/I9300BULE6/I9300BUALE6
Ukraine ........... Kyivstar .......... »» SEK »» I9300XXALE8/I9300OXEALE1/I9300XXLE8/I9300XXALE8
Uruguay ........... Claro ............. »» CTU »» I9300UBALE6/I9300UVCALE4/I9300UBLE6/I9300UBALE6
Vietnam ........... Unknown ........... »» XEV »» I9300XXALE8/I9300OLBALE5/I9300DXLE8/I9300XXALE8
Vietnam ........... Unknown ........... »» XXV »» I9300XXALE8/I9300OLBALE5/I9300DXLE8/I9300XXALE8

EDIT/1: added India/Unbranded, Mexico/Telcel, T-Mobile: Austria, Croatia, Czech Rep, Germany, Macedonia & Netherlands​

EDIT/2: added following fw

Unbranded: Australia, Austria, Egypt, Greece, Kazakhstan, Luxembourg, Morocco, Portugal, Russia, Switzerland, Turkey & United Arab Emirates

Branded: Australia/Optus, Czech Republic/O2, Dominican Republic/Claro, Ecuador/Claro, France/Bouygues Tel, Germany/O2, Morocco/Maroc Telecom, Morocco/Meditel, New Zealand/Vodafone, Norway/Telenor, Peru/Claro, Portugal/TMN, Puerto Rico/Claro, UK/BT Mobile & Ukraine/Kyivstar

Unknown: Netherlands/PHN, South Africa/XFE & Spain/PHE

​

EDIT/3: added Brazil - Tim, Unbranded & Vivo (thx @erivaldoff & @BlogAndroidPlay)​

EDIT/4: added Argentina/Movistar (UFN), Caribbean/Digicel-Profile (JDI), Colombia/Movistar (COB), Colombia/Unbranded (COL), Ecuador/Movistar (EBE), France/Unbranded (XEF), Guatemala/Claro (PGU), Hungary/Telenor (PAN), Hungary/Unbranded (XEH), Italy/Tim (TIM), Panama/Claro (CPA), Panama/Movistar (PBS), Peru/Movistar (SAM), Poland/Unbranded (XEO), Romania/Unbranded (COA), Spain/Movistar (XEC), Trinidad & Tobago/Unbranded (TTT)​