Nokia Lumia 920 and Nokia Lumia 820 1232.5957.1308.00xx reach their firmware version, while the Nokia Lumia 620 comes to 1030.6407.1308.00xx version with a lot of improvements, in both versions.
For Nokia Lumia 920 and Nokia Lumia 820 will face:
Improved automatic brightness adjustment
Correction of flashes on the screen during the call.
Improved stability and performance of the device.
As for the Nokia Lumia 620 , these are the improvements:
Improved functions of the touch screen, including multitouch actions.
Improved sound quality Bluetooth headphones.
Improved camera performance with the use of the flash.
Improved performance and stability of the device.
This update will be extended to all markets in a phased manner over the next few weeks, as is standard, the corresponding receive notification when the update is available.