These firmwares will work on any Lumia 920 RM-821 device sold in Australia (however flashing to foreign devices should also be alright). And remember, flash at your own risk. Download Nokia Flash File. Get the Latest Rom, Offical Firmware and Software. Firmware Nokia LUMIA 920. Firmware Nokia LUMIA 920.
Ahead of the final release of the Amber update for Windows Phone 8, bringing the latest OS release from Microsoft (GDR2) and unofficial custom ROMs with the update for Nokia's Lumia 820 and 920 are already available. The firmware updates are only available for the said devices as of now and you can download them from WindowsMania.pl (Lumia 820, Lumia 920).
How To Flash Nokia Lumia
Before you go ahead with the update, we must caution you that you will have to do this at your own risk as the process will wipe all the data from the phone including all app settings that you might have made. It can also happen that you might not receive the official update when it releases. However, if you are one of those who love to live dangerously, then head over to NokiaViews and follow the instructions to get started.
The GDR2 update brings a host of improvements to Windows Phone 8 including FM radio activation, Other Storage issue fix, and some minor enhancements to Xbox Music. The Amber update for Nokia phones also adds features such as Glance Screen, and flip to silence among others. The official Amber update is expected in August and knowing that the update is already on Nokia servers, we don't think the wait will be much longer.
Fortunately, XDA Recognized Contributor Kaptaiin has put together a well-detailed tutorial that covers everything about flashing Windows Phone 8.x or Windows 10 Mobile on your Lumia device.