It seems that Windows Phone 7.8 update is even closer to be released, at least for the Nokia Windows Phone smartphones from the first generation. The devices in question are the Nokia Lumia 900, Nokia Lumia 800, Nokia Lumia 710, Nokia Lumia 610 and Nokia Lumia 510.
The firmware version 1750.823.8858.12460, which is the much expected Windows Phone 7.8 update, makes its appearance on the Nokia servers.
The update is now available to be downloaded on Navifirm. So if If you don't want to wait to the official update, that is scheduled for the begging of 2013 and you want to upgrade your Nokia Lumia smartphone to WP7.8 by flashing your phone, then just download the firmware from Navifirm and start enjoying Windows Phone 7.8 on your Lumia smartphone.