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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
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www.red-gsm.net
Nokia Lumia 920
Xiaomi Mi Mix 2S

vlk56

Member
May 9, 2009
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1
Vlkoš
first at all, you dont need to use restore bootloader... is not true to unlocked bootload can cause harm. nobody complained about this yet. this warning is just "maybe is possible" warning...

Creators (CU) have some bugs on 920 if you made hard reset (BT not working but then you must wait next update to fix that).

i like more anniversary update (x30 ID info in registry to update from 10586 to AU)... works fine and dont have bugs and problems after hard reset

Ok thank you, so now I have 10.0.14393.1066 installed. Now how to disable auto update? I got a notification to restart the phone to install 10.0.15063.297 but I´m not sure if it is a good idea.
 

dxdy

Senior Member
Apr 17, 2008
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Nokia Lumia 920
Xiaomi Mi Mix 2S
Ok thank you, so now I have 10.0.14393.1066 installed. Now how to disable auto update? I got a notification to restart the phone to install 10.0.15063.297 but I´m not sure if it is a good idea.

depend did you want go to CU, or stay with AU builds
if you dont want upgrade to CU, you must do hard reset, and now set ID for Lumia x30 to stay with AU builds...
 

dxdy

Senior Member
Apr 17, 2008
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Nokia Lumia 920
Xiaomi Mi Mix 2S
It depends what is better, I´ve never tried CU. I´m not experienced at all so I´m grateful for your recommendation.

overall CU not that bad, but have few annoying bugs
also windows maps not work great, many roads and objects missing

my advice is to stay with AU builds, set phone to Lumia 735 for example
do fix glance screen (if not already), increase virtual memory and remove unnecessary and not working old apps (old nokia account, old call and message filter...
 
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vlk56

Member
May 9, 2009
16
1
Vlkoš
overall CU not that bad, but have few annoying bugs
also windows maps not work great, many roads and objects missing

my advice is to stay with AU builds, set phone to Lumia 735 for example
do fix glance screen (if not already), increase virtual memory and remove unnecessary and not working old apps (old nokia account, old call and message filter...

OK thank you, I followed your instructions and now I have 10.0.14393.1593 (one update came after hard reset). But now I have a trouble with downloading the Czech keyboard. It says that the update was unable to download. Is there a possibility to fix it?
 

Terex83

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Aug 9, 2017
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Hi, good job installing the latest AU build. I too had some difficulty installing keyboards for different languages. I can't give a solution other than suggesting to try again later and do a soft restart (power button, volume down). I want to make a point as well because after installing the keyboard, the phone has to reboot to complete the installation. This is strange in my opinion unless, as it seems, system files are changed. For instance, my lock screen is in Dutch, maybe because of date/time zone settings. The calculator uses a comma as decimal point. But the phone language is English.
 

vlk56

Member
May 9, 2009
16
1
Vlkoš
Hi, good job installing the latest AU build. I too had some difficulty installing keyboards for different languages. I can't give a solution other than suggesting to try again later and do a soft restart (power button, volume down). I want to make a point as well because after installing the keyboard, the phone has to reboot to complete the installation. This is strange in my opinion unless, as it seems, system files are changed. For instance, my lock screen is in Dutch, maybe because of date/time zone settings. The calculator uses a comma as decimal point. But the phone language is English.
Unfortunately soft reset didn´t help. Still the same issue.
 

dxdy

Senior Member
Apr 17, 2008
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Nokia Lumia 920
Xiaomi Mi Mix 2S
after hard reset did you set again to any x30 ID?

also you can try enable insider release preview and try download keyboard...

---------- Post added at 12:09 PM ---------- Previous post was at 12:09 PM ----------

after hard reset did you set again to any x30 ID?

also you can try enable insider release preview and try download keyboard...
 

vlk56

Member
May 9, 2009
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after hard reset did you set again to any x30 ID?

also you can try enable insider release preview and try download keyboard...

After hard reset the ID was set to 735. But I didn´t do hard reset after that update from 10.0.14393.1066 to 10.0.14393.1593. Is that a mistake? Joining Insider program didn´t help, still the same error. I also noticed that there is an issue with installing apps from internal storage. I chose developer mode but when I try to install Interop tools or its dependencies it only blinks and that´s all, no complete installation. :/ Do you have any idea how to improve it, the keyboard primarily?
 
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blackpanther0

Member
Aug 5, 2016
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i'm back on xda. seemigly, until yesterday, everything is ok. Today, i was walking in Milan, the surprise: Maps doesn't work. nay, it works, but the roads not see... only the roads name it displays.

Any solution?
 

dxdy

Senior Member
Apr 17, 2008
5,049
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48
www.red-gsm.net
Nokia Lumia 920
Xiaomi Mi Mix 2S
i'm back on xda. seemigly, until yesterday, everything is ok. Today, i was walking in Milan, the surprise: Maps doesn't work. nay, it works, but the roads not see... only the roads name it displays.

Any solution?

rollback to AU (use Lumia x30 ID)... CU have problems with maps

---------- Post added at 09:32 PM ---------- Previous post was at 09:28 PM ----------

After hard reset the ID was set to 735. But I didn´t do hard reset after that update from 10.0.14393.1066 to 10.0.14393.1593. Is that a mistake? Joining Insider program didn´t help, still the same error. I also noticed that there is an issue with installing apps from internal storage. I chose developer mode but when I try to install Interop tools or its dependencies it only blinks and that´s all, no complete installation. :/ Do you have any idea how to improve it, the keyboard primarily?

dont know all working fine on my 920 and croatian language...

my steps:
flash with WDRT
update to 8.1 denim
unlock bootloader with WP Internals
change registry to Lumia 735
officially update to W10M with upgrade advisor
update to latest AU build 14393
hard reset
 

vlk56

Member
May 9, 2009
16
1
Vlkoš
dont know all working fine on my 920 and croatian language...

my steps:
flash with WDRT
update to 8.1 denim
unlock bootloader with WP Internals
change registry to Lumia 735
officially update to W10M with upgrade advisor
update to latest AU build 14393
hard reset

Followed your steps but I still can´t install .appxbundle (Interop tool) from the storage. I don´t know how to enlarge virtual memory in registy now because the bootloader is not unlocked. I don´t know why and when it happened but the phone seems to be 920 again. Any suggestion? :(

At least the Czech keyboard is working properly. But the phone is slow due to small virtual memory...
 

dxdy

Senior Member
Apr 17, 2008
5,049
2,107
48
www.red-gsm.net
Nokia Lumia 920
Xiaomi Mi Mix 2S
Followed your steps but I still can´t install .appxbundle (Interop tool) from the storage. I don´t know how to enlarge virtual memory in registy now because the bootloader is not unlocked. I don´t know why and when it happened but the phone seems to be 920 again. Any suggestion? :(

At least the Czech keyboard is working properly. But the phone is slow due to small virtual memory...

unlocked bootloader not needed for interop tools. you need enable developer settings and device portal

which build now? if 10586 then you must use older interop tools
https://forum.xda-developers.com/showpost.php?p=68982441&postcount=284

if build 14393 or newer use this version
https://forum.xda-developers.com/showpost.php?p=71000190&postcount=607

glance fix if needed
https://forum.xda-developers.com/showpost.php?p=71927078&postcount=67
 

vlk56

Member
May 9, 2009
16
1
Vlkoš
unlocked bootloader not needed for interop tools. you need enable developer settings and device portal

which build now? if 10586 then you must use older interop tools
https://forum.xda-developers.com/showpost.php?p=68982441&postcount=284

if build 14393 or newer use this version
https://forum.xda-developers.com/showpost.php?p=71000190&postcount=607

glance fix if needed
https://forum.xda-developers.com/showpost.php?p=71927078&postcount=67

Build 10.0.14393.1593. Downloaded to the phone storage but it just blinks after pressing Install button. Every single .appx file.
 

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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".