If you need to manually reset your Nokia Lumia 800, you need to do the following:
- Ensure that the phone is charged.
- Press the volume down, the power and the camera buttons at the same time.
- Wait for around 5 to 10 seconds for the phone to perform the hard reset.
Remember that you can also login into your Windows Phone account, follow the steps to locate your phone and then click on the Erase option. This will send the command to the phone to reset. Is basically a remote hard reset, which is quite handy.
Now there are a couple of issues you can run into. The hard resent can take quite some time to finish, so be patient. If it hangs on the “Nokia” intro screen, give it time.
Another annoying and confusion issue is that if you perform the hard reset (online or manually) and the phone doesn’t have enough charge, it could hang and get stuck in the intro or battery screens. The phone could get into a crazy reboot cycle, where it tries to complete the hard reset, but since it doesn’t has enough power it will get stuck in the battery charging screen. You just need to leave it charging for some time. It will probably take longer than normal to charge on this circumstances, so again, be patient. When the phone has enough charge, it will reset and complete the process.
The trick to fix it was to understand what the phone was trying to do, why it was behaving like that, and most of all, just be patient. Not sure exactly how much time it took, but probably one or two hours in total. So if you run into this situation, I hope that this can help you and not consider your phone a dead “brick”.