[Windows 10 Mobile] kappa011:
Lumia 1520, Serbia - Windows 10 TP for Phones, at last!

Hi, guys,

I have managed to pull this through for Lumia 1520 in Serbia. My WPFlights.xml file is attached, but do read this first in order to understand additional steps that MUST be taken if you’re stuck with Windows Insider offering no updates after following initial (OP’s) procedure.

The most important thing first - apparently, you CANNOT get Windows 10 Technical Preview for phones on some of the devices with OS version 8.10.14226.359 or greater! Here’s the link to the MS official pointing this out: I have a supported device for Windows 10 Technical Preview for phones, but I don’t see any updates available for install (sounds familiar, right?). TLDR: Shortly, it boils down to this:

Soooo, if your device’s been armed with Denim, for instance, chances are - you’re getting a NO GO! Which is a bit ironic, really, I mean, Tech Previews are generally meant for tech savvy people, eager to jump in on any new build, and it turned out they’re being punished by MS for having all the can-do and know-how for the job! First, no W10 joy for the flagship models, now this? I don’t know if this is a region specific issue, but I guess that’s why so many people struggle with this with no result.

Anyway, these are my steps:

Get your SIM an SD Card out. Write down your Product code (059XXXX, under the SD card) and Product Type (RM-937 or whatever). VERY important step. Keep both cards out for the rest of the steps.

Downgrade to Cyan first! I know it sounds like a lot of work (for some), but there’s a great tutorial here - Nice piece of work, Anaheiim! - it will get you through all the way.

Hard reset.

Get THE RIGHT info on the phone model that’s eligible for W10TPfP upgrade in your region. This is the HARD(est) one! Start with your Product code and get binging or googling… A lot! There are some useful places to go through:

seidea.com

and

http://mrcrab.net/Nokia-Product-Code.html?ProductCode=XXXXXXX (insert your Product Code here)

I'll digress a bit here, to give you a taste of how I did it, with the following info to start with: 059V330, rm-937_eu_hungary_1002 and 000-33. It turned out that I had (get this) Czech version: RM-937 VAR EURO CZ CV BLACK. Bought in Serbia, with Hungarian model and Czech version - give me a freaking break?!

Firstly, I have tried to find a RM-976 (Lumia 630) with similar “specs” (mess), and came up with RM-976 VAR EURO CZ CV, with the _1231_ part in most of that ROM files on mrcrab.net. For most of the guys here (UK, US, DE, IT, FR, etc.) that would be it (you lucky bastards! ;)). Naturally, I went through with RM-976_1231 as PhoneManufacturerModelName and 000-33 as MOID, but guess what - no cigar! Tried again, this time with MOID of 000-CZ, still - nothing (again, you lucky, lucky, bastards! :laugh:).

Luckily, I have previously stumbled upon a Lumia 630 in the neighborhood, and through the similar process, found out that that it boasts a RM-976 VAR EURO 7F CV (generic, unbranded) and came up with _1205_ for PhoneManufacturerModelName.

That was it, the equation goes: RM-976_1205 + 000-33 = Windows 10 TP for Phones (all) over Lumia 1520!

​

Follow through the steps in the first post (and a GREAT one, at that, RustyGrom!), with one difference (for me) - leave proxy ON all the time. You will first get an update or two, then the W10TPfP.

Hard reset.

Return your phone to previous state - go through the steps but, instead of "Insider Fast", choose "Set to Lumia 1520". You should edit the attached WPFlights.xml file a bit to restore it to your specific model, there's a section near the end of the file, switch PhoneManufacturerModelName value to your starting model.

Turn Wi-Fi proxy off, check for updates and you should get the last one (important update) - Denim. That should bring you right to where you’ve started from, apart from having W10TPfP as well.

Hard reset.

Get your SIM card and SD card back in.

Enjoy restoring your backups, customizing and squeezing every last bit of phuck out of your W10 phone! You have deserved it.

Anyways, sorry for this monstrosity of a post (length-wise), but it took me almost 12 hours to get through all this s#it knowledge, so I felt a need to share and maybe save some poor souls from experiencing all the pain. So there’s an attached WPFlights.xml file - I guess it should work for most of the Balkans countries (unbranded models, carrier-unlocked or whatever) and maybe some more within Eastern Europe…

Cheers.