Recently Microsoft rolled out the Windows Phone 7.8 upgrade for the Windows Phone 7.5 operating system. Nokia announced that this upgrade will be available for their mobile phones during the first three weeks of the February 2013. I checked if this upgrade is available for my Nokia Lumia 900 and every day I got the same message: “Your phone is up to date.” After three weeks I decided to research if there is an alternative solution for my issue and I found a couple of possible solutions. Here I’ll describe the most user-friendliest solution which solved my issue.
How to Upgrade Nokia phone to THE Windows 7.8
First of all you need to turn off the WiFi (Settings –> WiFi –> Off) and the data connection (mobile network –> Data connection –> Off) on your mobile phone. In the second step you need to connect your Windows Phone to the Zune software. Now we are coming to the trickiest part of this process.
You must to check the Update through Zune (Settings –> Phone –> Update), but after that you must to disconnect your computer from the internet after 2-3 seconds. This is not the fixed time, so you’ll probably need to find your own number of the seconds (in my case it was 9 seconds).
The main goal of this step is to get the message: “An update is available for your phone.” and the “Update” button bellow this message. If you receive the massage that your phone is up to date, you didn’t disconnect your internet connection quickly enough and you need to repeat this step. Sounds silly, I know, but it works when you get it right.
After you successfully complete this step you must enable your internet connection and click on the “Update” button and the update process will be started. You just need to follow a few simple steps on the screen.
After the upgrade process is successfully completed, you’ll got the screen displayed below. Depending on your OS version you’ll probably need to repeat these steps a couple of times to get the latest OS version (8858). If you started, like me, with the OS version 8779 you’ll need to repeat this process up to 4 times.
After the successful upgrade to the OS version 8858 (the Windows Phone 7.8 version), you can turn on your WiFi and the data connection. :-)
You should be patient and careful with every step, specially with disabling of the internet connection. I spent around 90 minutes to complete this process. If this method doesn't work for your phone, it is possible that the update for your phone is not ready on Microsoft servers and you can try again in a few days. Unfortunately, it is also possible that the update may never come for your mobile phone. Anyway, you should check the official announcements form Nokia and Microsoft.