[Windows Phone 7 Development and Hacking] jojojohnson7410:
If you're looking for some answers.... :D

Sooo, I decided to be a brave and adventurous one on this fine day at 7AM and give it a shot in hopes I wouldn't brick my friend's phone. If you're having issues with the earlier "guide" or if you're just looking for some clarifications,I hope this will suffice.

WARNING: I WILL NOT BE HELD RESPONSIBLE IF YOUR PHONE TURNS INTO A NUCLEAR BOMB! You choose to follow this guide under your own good will and with the knowledge that something MIGHT go wrong and blow up or brick your phone. You can attempt to flash back the original firmware which I can show you how, but there's no guarantee. So no mobs at my door please D:

First, not sure why you need the NaviFirm as it doesn't seem to sync up with the Products Tool. In addition to this, I couldn't get my Products Tool to open any external firmware files, so if you're having an issue there too, this might help.

I just used the Products Tools provided by OP (its in the Nokia Care Suite). Upon opening it, I had to connect the phone and let it sync up. If you're having problems letting it auto-detect, just click File > Open Product. From here, it should be self explanatory as to which device to click on :silly: After doing so and choosing your phone, click the Programming tab and then click "Recovery".

After this, I made sure to check the "Update automatically" checkbox at the bottom. If you don't do this, then don't blame me if you can't find anything, cause nothing will show up.

Since I couldn't open the option to "Open data package location", I attempted to click the "Find Online..." button in order to find the firmware. You MIGHT need NaviFirm for this (can someone confirm this?) but if anything, it'll only cost you another 10-20 minutes of your life depending on your internet speed.

From here, a dialog box shows up. If you don't see the versions listed, try using the "Open Product" selection under the File menu, as that's how I got mine to show up. From here, it should be the first one, but if not, here's the info you should search on:

Code: 059N0V3

Variant Name: RM-803 VAR APAC1 IN CV THEME WHITE

Version: 1600.3036.8858.12460

From what I can tell, the variant name/code doesn't really make much of a difference. So, for most of you who were asking earlier about whether any of the 200 different variants make a difference, apparently not. They all come with English, and at most you'll just have to change the language when it's done flashing. If anything, just use the build I listed above and you should end up with a starting language of UK English :D Testing the phone out, I can see that it is working for the most part, but I'll update if anything goes wrong, and people should report if something goes bad. That way, we can try and figure out the best route of installation.

Once you choose one, click the Download button and let it do it's thing. It'll download and when it's done, you can highlight the particular build and press the "Start" button. From here, it's smooth sailing as it'll do it's thing and then reboot you, hopefully, into a Windows 7.8 build :D

Note that the following was performed on a T-Mobile RM-803 Black, so your mileage and steps may vary depending on phone. :)

....annnndddd, done. :D wasn't too bad now, was it? :) Enjoy Windows 7.8!

Oh, and I almost forgot. The flashing back to the original firmware :)

If the steps from the OP worked for you using external firmware files, then just find the previous version build in NaviFirm and then just download it. From there, just flash it, and if your phone is dead, they advise you use the "No Connection" option under device in Nokia Care. As simple as that. :) (let me know if this is confusing. I can expand it

If it didn't work for you, try to find the closest firmware in the download window closest to your original code. I've checked, and most of them only have the latest firmwares, so you might be stuck :\ if someone can figure out how to get back down using this method, that'd be awesome :D Well, hopefully you won't need it, so good luck!