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Installing Windows 10 Mobile Tech Preview on Lumia 925 & Old Lumias after downgrading

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dxdy

Senior Member
Apr 17, 2008
5,049
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www.red-gsm.net
Nokia Lumia 920
Xiaomi Mi Mix 2S

no. this is only for new x50 series... for old x20 Interop tools is enough

just select Interop unlock in Interop Tools

szjuip.jpg


first enable only "Restore NDTKSvc", wait 15 seconds, restart phone

image.png


run Interop tools again and now enable first two option in interop unlock

image.png



thats all... now you can change registry values
 
Last edited:
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vlk56

Member
May 9, 2009
16
1
Vlkoš
no. this is only for new x50 series... for old x20 Interop tools is enough

just select Interop unlock in Interop Tools

szjuip.jpg


first enable only "Restore NDTKSvc", wait 15 seconds, restart phone

image.png


run Interop tools again and now enable first two option in interop unlock

image.png



thats all... now you can change registry values

Thank you! Last question (I hope) - is there a way to install xap files from computer via the portal? It gives error, appx no problem.
 

dxdy

Senior Member
Apr 17, 2008
5,049
2,107
48
www.red-gsm.net
Nokia Lumia 920
Xiaomi Mi Mix 2S
Thank you! Last question (I hope) - is there a way to install xap files from computer via the portal? It gives error, appx no problem.

only way to install xaps is with SDK and deployer and xap files must be unlocked (patched). original encrypted files is impossible to deploy


https://forum.xda-developers.com/wi.../tutorial-deploy-xaps-easily-wpv-xap-t3263968

also another tool for deploy XAP files (but dont forget to install SDK lite)
https://forum.xda-developers.com/attachment.php?attachmentid=2610524&d=1393831436
 

vlk56

Member
May 9, 2009
16
1
Vlkoš
only way to install xaps is with SDK and deployer and xap files must be unlocked (patched). original encrypted files is impossible to deploy


https://forum.xda-developers.com/wi.../tutorial-deploy-xaps-easily-wpv-xap-t3263968

also another tool for deploy XAP files (but dont forget to install SDK lite)
https://forum.xda-developers.com/attachment.php?attachmentid=2610524&d=1393831436

I´m asking because of app Lumia Camera. Is there a difference between Lumia and Windows Camera in photos quality please?
 

Terex83

Member
Aug 9, 2017
8
0
I´m asking because of app Lumia Camera. Is there a difference between Lumia and Windows Camera in photos quality please?

No, i don't think so. None of the apps provide any discernible difference in quality - even Proshot (which is not free). However, the Windows Camera app is slow on my Nokia phone 925 with Win10 AU, so I use Camera360 Sight.
 

Antharro

Member
Sep 10, 2017
12
3
Lumia 520 - No upgrade?

Hello,

First off - thank you to everyone who's posted a edited a guide or who helps out. This place is amazing and has helped me with many devices over the years. I have an HP Touchpad running Nougat, an Amazon Fire HD with the Google Play Store up and running, and so much more.

This is the first time I've needed to ask for help! I have a Lumia 520 which runs 8.1 Denim absolutely fine. When W10 was available through the Insider app, I tried that but eventually rolled back to 8.1. Recently, I wanted to try it again, so looked on here, did the registry edit (went for a 950 XL), updated through the normal software update - a bit slow but no problem. Decided I want to try the process again so I could be a bit more confident in the process.

So I used the WDRT to get the phone back to factory, set it up as a new phone, updated all the outstanding apps from the store, updated to 8.1 Denim, installed the Upgrade Tool. Then unlocked the bootloader, did the registry edit. Upgrade Tool said not available for my device. Installed the Insider app (I know it doesn't work...) but no luck there- "Server Error". I tried changing the details in the Registry to a Lumia 735, but nothing changed. Also tried another WDRT reset and repeated the process except for using a 735 from the outset.

I'd ideally like to go up to the Creators Update, just to see what it's like, so that's what I'm aiming for. This is not my daily use phone so it's not important to have everything perfectly functional.

My phone:
Nokia Lumia 520
3058.50000.1425.0006
RM-914_eu_euro1_327
000-GB
059S3T5

Any help would be appreciated - thanks!
 
Sep 29, 2017
1
0
Help-Me Pls

Hello everyone, I did the process but in the middle of it the phone stopped and did not give more signal of life, I turned it off I turned on, with less volume and power and nothing, I do not know what to do anymore, the computer no longer recognizes it in any software. .

if you can someone help me
 

dxdy

Senior Member
Apr 17, 2008
5,049
2,107
48
www.red-gsm.net
Nokia Lumia 920
Xiaomi Mi Mix 2S
Hello everyone, I did the process but in the middle of it the phone stopped and did not give more signal of life, I turned it off I turned on, with less volume and power and nothing, I do not know what to do anymore, the computer no longer recognizes it in any software. .

if you can someone help me

possibly battery died... leave on charger at least one hour, start WDRT, connect phone, press volume minus and power, and if you lucky, you can restore phone...

if you dont have luck, there is one solution to restore bricked device
https://forum.xda-developers.com/windows-phone-8/development/help-programmer-unbrick-jtag-t3082592
 

44JAX44

New member
Sep 30, 2017
1
0
hello is this method still works ? I unlocked the bootloader enabled root access changed the values rebooted all working fine but when I check for updates there is no new updates and the upgrade advisor says my phone isnt compatible with windows 10 then I downloaded the insider app and chose 1 nothing happened but now phone gets stuck on checking for updates and still no option to upgrade to 10
 
Did this on my European unlocked L920 yesterday...had to read and check the guide a few times to make sure I was doing it right but it worked first time.

Set it as L830 as per original instructions.
Had an auto-update last night.
Today installed insider and downloaded W10 fast ring preview.
Lots of app updates.
Finally finished and amazed how fast and stable it is.

Camera works, bluetooth works...and it reminded me how much I like WM compared to my now Android phone. :(
 

Stealing_heart

Senior Member
Jun 16, 2016
65
35
Hello everyone, I did the process but in the middle of it the phone stopped and did not give more signal of life, I turned it off I turned on, with less volume and power and nothing, I do not know what to do anymore, the computer no longer recognizes it in any software. .

if you can someone help me

The process is little bit trickier. Please download the Nokia Care suite. Download all the firmware files and place it in a folder as explained in this tutorial
https://forum.xda-developers.com/windows-phone-8/general/how-to-flash-nokia-care-suite-5-t3044200

It should flash the device and it should work because WDRT and other tools fail because of the registry fails and it's always a good idea to restore the registry before using WDRT.

P.S instead of navifirm use http://lumiafirmware.com/
 

Stealing_heart

Senior Member
Jun 16, 2016
65
35
Did this on my European unlocked L920 yesterday...had to read and check the guide a few times to make sure I was doing it right but it worked first time.

Set it as L830 as per original instructions.
Had an auto-update last night.
Today installed insider and downloaded W10 fast ring preview.
Lots of app updates.
Finally finished and amazed how fast and stable it is.

Camera works, bluetooth works...and it reminded me how much I like WM compared to my now Android phone. :(
Everything will work instead of maps and auto brightness
 
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rreehahs99

New member
Nov 10, 2017
1
0
shaunydub ive got a lumia 920 aswell. for the emergency bootloader which version did u use im a noob at this and having a hard time following the steps
 

imnotlucky

Member
Jul 6, 2017
6
1
Noob Question..
I watch the unlocking bootloader at youtube.
In WPI resource flashing
in 1st selecting "FFU file"
2nd here im confused where can i download the "MPRG_HEX"?
3rd is fine i already get it

only in 2nd im having a problem
My device is Lumia 925.
 

dxdy

Senior Member
Apr 17, 2008
5,049
2,107
48
www.red-gsm.net
Nokia Lumia 920
Xiaomi Mi Mix 2S
Noob Question..
I watch the unlocking bootloader at youtube.
In WPI resource flashing
in 1st selecting "FFU file"
2nd here im confused where can i download the "MPRG_HEX"?
3rd is fine i already get it

only in 2nd im having a problem
My device is Lumia 925.


you need FAST8960_CATWALK.hex
download it from lumiafirmware.com for your model (product code)
 

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  • 24
    Installing Windows 10 Mobile Tech Preview on Lumia 925 & Old Lumias after downgrading

    Howdy Guys,

    Windows 10 Anniversary update is out!! Well there is good news and bad news as well. Good News- Windows 10 Anniversary update is awesome and its stability is also good it is available for all mobile as well as for PCs. Bad news is that now old lumia(925,920,820,1020) will not even be able to install threshold build that means no Windows 10 update when you downgrade to WP8.1.
    All the registry hack tools for WP8.1 require Memory card so folks running WP8.1 with no memory card are helpless but, but there is a way you can install Windows 10 Mobile. This process is tedious and requires lot of patience. Don't give up!!

    Step 1- Install WDRT so that you can get all the necessary drivers. you can easily search for it on google.

    Step 2- Install Windows Phone Internals from here. thanks to @Heathcliff74.

    Step 3- Check the getting started page of WPInternal.

    Step 4- Now first we will unlock our bootloader and to do that we will be using WPInternal.

    Step 5- For Lumia 925 you have to select FFU file from C:\ProgramData\Microsoft\Packages\<Your Device Revision>\ Remember to select FFU file of the same version as of the version installed on your phone. If you have an FFU that is of older version than please flash it first with the FFU then proceed.

    Step 4- Then download the Emergency Flash Loaders by going to http://lumiafirmware.com. I have included for Lumia 925. It should be a .HEX file.

    Step 6- Then select the SBL3 engineering file and to enable ROOT access it is IMPORTANT to Select this file. I have included some files.

    Step 7- Now click continue and wait for the process to complete.

    Step 8- Now you can Enable root access.

    Step 9- Open RegEdit in your PC and click HKEY_LOCAL_MACHINE and then select files == > Load Hive.

    Step 10- Now in the dialog window navigate to MainOS ==> Windows/system32/config and select SYSTEM, it will ask for a name and name it such that you are not confused.

    Step 11- Now change the necessary keys. In this you have to navigate to Platform-->DeviceTargetingInfo and then need to change
    PhoneManufacturer = NOKIA,
    PhoneManufacturerModelName = RM-984_1006,
    PhoneModelName = Lumia 830,
    PhoneHardwareVariant. = RM-984
    For Lumia 925 I used the details of Lumia 830 Indian Variant. You can use the supported lumia which is close to your model in terms of spec.
    and after editing click unload Hive this will save your data and everything

    Step 12- Disable root access and press power+volumeDown key to soft reset and start your device.

    Step 13- Download Windows Insider and select preferred ring and you should see an update. Note after various updates release preview ring doesn't work for Lumia 830, so if you are using Lumia 830 or any unsupported devices then please use slow or fast insider ring

    Thank You.
    I would also like to thanks to @tofuschnitte.
    3
    It worked on Lumia 720. Thank you very much! :fingers-crossed:

    When i edited the registry i used this values:
    a)change " PhoneManufacturer " = MicrosoftMDG
    b)change " PhoneManufacturerModelName " = RM-1085_11302 (for Single SIM devices) // *** For all dual sim devices try = RM-1116_11258 ***

    4) change PhoneModelName = Lumia 950 XL (single sim) or Lumia 950 XL Dual SIM (for dual)

    5)change PhoneHardwareVariant = RM-1085

    I had found them on this thread http://forum.xda-developers.com/win...windows-mobile-10-redstone-rs1-build-t3319375

    Again, thank you! :good:
    2
    you still stuck in 2013 buddy?

    This is well know, is nothing new even if I'm an Android supporter we are talking about different architectures where by design Windows Mobile require less resources. Just to return in topic I'm running WM10 on 512 Mb RAM. To run smoothly Android, especially MM we need more then double RAM.

    PS: I just installed Redstone on L720. Finally to get the update to RS I used WPInternal as explained on OP but using these strings on registry:

    PhoneManufacturer " = MicrosoftMDG
    PhoneManufacturerModelName " = RM-1085_11302 (for Single SIM devices) // *** For all dual sim devices try = RM-1116_11258 ***
    PhoneModelName = Lumia 950 XL (single sim) or Lumia 950 XL Dual SIM (for dual)
    PhoneHardwareVariant = RM-1085

    Then after I upgraded to WM 10.1 TH2 I put these values to get Redstone but using CustomFPD

    PhoneHardwareVariant – RM-1027
    PhoneManufacturer – NOKIA
    PhoneManufacturerModelName – RM-1027_1007
    PhoneMobileOperatorName – 000-HK
    PhoneModelName – Lumia 636
    PhoneSOCVersion – 8926

    It's working fine except BT toggle remaining selected even if not enabled. Under monitoring.
    2
    First you have to open regedit on your PC and this time it will be showing your PC's registry after then you have to just click HKEY_LOCAL_MACHINE then click on file and load hive then open MainOS in the dialog windows and navigate to system32 >config>SYSTEM and click ok. then you will get your Phones's registries.

    I did several tests but it seems that I could get access basically as showed on this page:
    http://www.kapilarya.com/the-proces...e-because-it-is-being-used-by-another-process
    In our case we should look for SYSTEM instead of SAM and the root drive is mounted as "G" letter in my WIn10 partition, then I could edit the registry into the root drive.

    Now updating....
    2
    Hi Everyone, i tried to upgrade my Lumia 925 from 8.1 to 10.

    I followed the guide step by step. All went OK but in the last step when i install app "Windows insider" no build found! i cannot select any channel.

    Any advice?

    Did you check your phone model details in "Extras and Info"? Is it displaying "Lumia 925" or the one to which you've set, I assume you must have set it to "Lumia 830"?

    ---------- Post added at 06:51 AM ---------- Previous post was at 06:45 AM ----------

    Could I get some clarification on a few aspects of the process?
    1. After upgrading, will a hard reset (to restore backup) return the registry values to their original settings?
    2. If so, is the whole process of going back to 8.1 necessary for further updates? It seems that some folks mention changing the registry values again, but I don't see how if WPInternals doesn't support the latest build.
    3. If restoring backup data is desired, is it best to do that while on the latest supported build (so that the registry values can be changed) and then continue the updating process?

    Yes, hard reset will change it back to its original registry values. After hard reset you can change the registry values by installing "Interop Unlock Tool" in Windows 10 Mobile you can search for the tool in this forum or you can use any search engine to search for it, so no need for "WP Internals". If you still want to go back to Windows Phone 8.1 you can use "Windows Device Recovery Tool".