I9300XXDLIH O2 Samsung Galaxy S3 Official 4.1.1 Jelly Bean Build Release

O2 mobile network provider in United Kingdom and Ireland seems never let their users of Samsung Galaxy S3 left behind for the Jelly Bean update. Today, O2 also launched the Jelly Bean upgrade via OTA that weighs around 279MB. The firmware build is I9300XXDLIH, the same build with that has released in Europe mobile phone operators like Vodafone, A1, SFR and Swisscom I9300XXDLIH-I9300XXDLID. We are also keeping an eye on Orange, T-Mobile and other smaller networks that might also consider distribute each of their specific build version, this includes the unbranded Galaxy S3's. As of now, only few countries has its Jelly bean upgrades,  like Poland, Spain, Germany and France unlocked S3's already has it.

Firmware build info

Ireland (O2 GT-I9300)
PDA: I9300XXDLIH CSC: I9300O2IDLI2 MODEM:I9300XXDLID

United Kingdom (O2 GT-I9300)
PDA: I9300XXDLIH CSC: I9300O2UDLI3 MODEM: I9300BWDLI1

Again, this update is already rolled out in UK and Ireland users of Samsung Galaxy S3 GT-I9300 under O2 mobile network. Other countries with O2 operators also like Germany, Czech Republic and etc. will probably also follow soon. You can check it out via OTA or Kies, just ensure that your device is currently runs with original O2 default firmware or else your device can't get any prior 4.1.1 Jelly Bean update.

I9300XXDLIH O2 Galaxy S3 GT-I9300 4.1.1 Jelly Bean Stock ROM

For advance users, who currently runs with any custom ROMs, other region firmware and or firmware leaks and wanted to return back to O2's stock firmware, here's the original stock ROM build that you can use to install it manually.

Country/Carrier	Firmware info	Android version	Stock ROM
United Kingdom (O2 GT-I9300)	PDA: I9300XXDLIH CSC: I9300O2IDLI2 MODEM:I9300XXDLID	4.1.1 Jelly Bean	Grab it here: Galaxy S3 I9300 Firmware
Ireland (O2 GT-I9300)	PDA: I9300XXDLIH CSC: I9300O2IDLI2 MODEM:I9300XXDLID	4.1.1 Jelly Bean	-
Germany (O2 GT-I9300)	PDA: I9300XXDLIH CSC: I9300VIADLI2 MODEM:I9300XXDLID	4.1.1 Jelly Bean	-
Czech Republic (O2 GT-I9300)	PDA: I9300XXDLIH CSC: I9300O2CDLI2 MODEM:I9300XXDLID	4.1.1 Jelly Bean	-

Guide for manual installation can be found here.