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

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Stealing_heart

Senior Member
Jun 16, 2016
65
35
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.
 

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  • FAST8960_CATWALK.hex.zip
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Last edited:

ibbbo

Member
Jul 7, 2010
31
3
Sofia
Hello ArkhamX, did you try to use different SBL3 file?

I also have 928 and need to make the same steps, in order to enable mass storage mode on this device (to allow me to fix the missing Glance after RS Update).

Dear gakshat14, as far as I understand from the official site of WPinternals and around the forum, if you use different SBL3, you can't unlock Mass Storage Mode.
Also, there is a risk to brick your device (despite, that 928 is based on 920, but still).
 

gakshat14

Member
Aug 2, 2016
7
0
Hello ArkhamX, did you try to use different SBL3 file?

I also have 928 and need to make the same steps, in order to enable mass storage mode on this device (to allow me to fix the missing Glance after RS Update).

Dear gakshat14, as far as I understand from the official site of WPinternals and around the forum, if you use different SBL3, you can't unlock Mass Storage Mode.
Also, there is a risk to brick your device (despite, that 928 is based on 920, but still).
if you will go through the video on their official website you can use it. just go to the website then navigate to tutorial and click on creating custom rom and watch it carefully. SBL3 files are based on SOCs so these phone use same SOCs.
 

gakshat14

Member
Aug 2, 2016
7
0

Odin9126

Member
Jun 24, 2010
7
3
Hi,
I just followed your step by step and I want to thank you !

I tried multiple time before and I was not able to update my phone as I pushed an app on it.

Thanks for all the steps described and a huge thanks for SLB3 files !

:good:

Will it directly update from 8.1 to Redstone? Or 10586 will be downloaded first, and then Redstone?
On my phone it's actually downloading a newer version of WP8.1
I guess W10M will be the next one :)

Edit : FYI, after the update Insider app was not working anymore and Windows Update said : No update available.
I simply restart my device, then seems like an new update is avaialble. Should be W10M.
 
Last edited:

mahdi75

Member
Aug 15, 2015
49
49
www.ghiasi.net
Hi,
On my phone it's actually downloading a newer version of WP8.1
I guess W10M will be the next one :)

Edit : FYI, after the update Insider app was not working anymore and Windows Update said : No update available.
I simply restart my device, then seems like an new update is avaialble. Should be W10M.

Was the upgrade successful? Were you directly upgraded to 14393? Or 10586 came first?
 

Odin9126

Member
Jun 24, 2010
7
3
Was the upgrade successful? Were you directly upgraded to 14393? Or 10586 came first?
So the process was successful ! :)

I was under WP8.1 Cyan (restored by WDRT) > Updated to WP8.1 Denim > Updated to W10M TH2 > Updated to W10M RS1

It took me :
15 min to restore to Cyan
15 min to go to Denim
45 min to go to TH2
45 min to go to RS1

Plus all the manipulations you have to do with WPInternal, all the system update to download and then update all system apps...

It's about 3 hours to get all working (also depending on your connection speed, mine is about 2Mo/s)

I have to say it seems to be working well, but still not as smooth as WP8.1 unfortunatly.
At least we can enjoy a fully fonctionnal W10M and hopefully a lots of new apps (Instagram, etc...)

Cheers

PS : If after an update the system doesn't find the next one to install, simply give it some time and restart your device. I suspect Windows Insider app to be reinstalled after each update.
 
Last edited:
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tofuschnitte

Senior Member
Nov 29, 2012
204
40
did you do a hardreset after reaching the newest rs1 build? give it some time after that (~12 hrs) and reboot it. my 920 is in most cases as fast as it was with 8.1, th2 was slow compared to that
 

raghav9 9

Member
Sep 2, 2014
21
0
41
Beed
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

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 mark HKEY_LOCAL_MACHINE and click on files and select Load Hive.

Step 10- Now In MainOS navigate to 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 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.

Thank You.
I would also like to thanks to @tofuschnitte.
I had successfully updated my Nokia lumia 1020
 

jhigh2000

Member
Aug 7, 2016
8
0
Correct HEX File?

Thank you for this guide. The hex file on on lumiafirmware.com for my Lumia 925 RM-893 is FAST8960_CATWALK_AMERICAS.hex which is different than the one included in the post. Which one should I use?
 

thanhquanctu

Member
Aug 7, 2016
18
0
Need quick help about the step number 11
What is "the necessary keys"??? How can I check whether data is saved or not???
Is the solution working on L520???
Thanks a lot
 

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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".