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

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By Stealing_heart, Member on 2nd August 2016, 07:04 PM
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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.
Attached Files
File Type: zip Engineering-SBL3s.zip - [Click for QR Code] (1.37 MB, 17978 views)
File Type: zip FAST8960_CATWALK.hex.zip - [Click for QR Code] (64.0 KB, 5194 views)
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3rd August 2016, 06:05 AM |#2  
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Thanks!, but... I'm a lumia 928 user and I can't find a SBL3 file in my case, can you help me out?
3rd August 2016, 06:33 AM |#3  
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Quote:
Originally Posted by ArkhamX

Thanks!, but... I'm a lumia 928 user and I can't find a SBL3 file in my case, can you help me out?

You can use SBL3 file either of Lumia 925 or Lumia 920.
3rd August 2016, 11:48 AM |#4  
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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).
3rd August 2016, 12:58 PM |#5  
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Quote:
Originally Posted by ibbbo

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.
3rd August 2016, 04:45 PM |#6  
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Similar but if know little polish

http://www.windowsmania.pl/poradniki...rii-x2x-30870/
3rd August 2016, 06:13 PM |#7  
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Quote:
Originally Posted by gakshat14

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.

For some reason, I'm getting an unexpected error... why's that?
3rd August 2016, 10:29 PM |#8  
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Will it directly update from 8.1 to Redstone? Or 10586 will be downloaded first, and then Redstone?
4th August 2016, 09:15 AM |#9  
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ok, first Custom ROM done. Fully unlocked based on 586.494

BTW, you can't install RS on SOC8960

====

[Lumia 625][Custom ROM][Denim][Windows 10] WindowsMania v1 os: 10.0.10586.494
4th August 2016, 11:35 AM |#10  
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Quote:
Originally Posted by ArkhamX

For some reason, I'm getting an unexpected error... why's that?

It can be due to driver issues

---------- Post added at 10:35 AM ---------- Previous post was at 10:34 AM ----------

Quote:
Originally Posted by djtonka

ok, first Custom ROM done. Fully unlocked based on 586.494

BTW, you can't install RS on SOC8960

====

[Lumia 625][Custom ROM][Denim][Windows 10] WindowsMania v1 os: 10.0.10586.494

I just did and it's working fine.
4th August 2016, 08:30 PM |#11  
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Quote:
Originally Posted by djtonka

BTW, you can't install RS on SOC8960
[/URL]

I have RS running on a 810 and a 928 lol.
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