[Nokia Lumia 820] sun1000:
Hi

Its not good that we don't have Windows 10 on our old devices and I recently found a trick to "interop-Unlock" old Lumia phones . with "CustomWPSystem_0601.xap" (selecting mix radio app and "vcREG_MIX_RADIO_bootstrap.xap" to deploy) and with registry changes you can get Windows 10 mobile. but for Some people like me ( in Iran ) MixRadio is not available.but don't worry its not going to keep us from getting Windows 10 :) have a lot of this Tutr all around but this is a full ALL-IN-ONE for Lumia 820

BY DOING THIS THE WARRENTY IS PERHAPS VOIDED DUE TO ROOT ACCESS GRANTTING AND BOOTLOADER UNLOCKING( who knows :p)

I TAKE NO RESPONSIBILITY FOR ANY BROKEN DEVICE IN OF ANY KIND.DO IT AT YOUR OWN RISK .YOU WILL LOSE ALL DATA DURING THIS

Tested on Lumia 820 RM-825 Running Windows phone 8.1

NOTE : These steps are very much harder than a simple interop-Unlock and higher at the matter of RISK OF BRICKING YOUR DEVICE. So maybe you get confused or etc.. if you are new to windows phone or if you are a non-expert user. READ BEFORE DOING

1- Opt a Stock FFU file or Download via "NSU For reatil" or "Microsoft Device Recovery" . then name should be something like "RM825_3051.50009.1424.0002_RETAIL_im_mea3_287_02_440287_prd_signed.ffu"

pay attention to 3051.50009.1424.0002 part of the name it should be EXACTLY THE SAME WITH YOUR CURRENT VERSION IN PHONE (for you maybe a different number but still should be same in both your device and FFU file you got). If your Version is not the same, flash it with "NSU For retail" or any other tool.

2- Download Zip File from below and unpack it somewhere safe

3-Make sure to turn off your antivirus and HIPS and Auto Sand box if you have any

4-Go to dir where you unpacked the zip file and head t o "Windows phone Internals" and run "WPinternals.exe" you need to be Admin

5-OPTIONAL : Make a backup of your data :o

6-Connect your turned on Lumia to PC and let Driver get installed

7- Install "Nokia Emergency Drivers" . I used this. its better to restart your PC then.

8-In "Windows phone internals" click on "Unlock bootloader". and Select the folder you placed FFU file and set "Emergency Files" folder from Extracted(ONLY FOR LUMIA 820 <<RM825_3051.50009.1424.0002_RETAIL_im_mea3_287_02_440287_prd_signed.ffu>> FOR OTHERS VISIT THIS AND DOWNLOAD YOUR OWN) file to respected field and at last "Engineering SBL3" (FOR ALMOST ALL OLD PHONES IS IN ZIP FILE") folder to respected field. and hit continue. Follow next steps on screen

IN NEXT STEPS IGNORE ANY DRIVE ADDED TO YOUR PC . DO NOT CHANGE ANYTHING

9-Then hit "Enable root access " in windows phone internal and set respected fields then hit continue. follow next steps on screen

10- at last when Root access is enabled . you will in stock in Storage mode.to Escape press and hold "power+Vol Down" about 10 secent until phone vibrate (this is a soft reset). after all your phone will restart and will normally boot

11- Use "WPV XAP Deployer 2.0" to Deploy "CustomPFD_0600.xap" (You can find both in extracted zip file) (no need for "developer register" due to Root access)

12-Open CustomPFD added to your app list and head to HKLM-->SYSTEM-->Platform-->DeviceTargetingInfo and change these

Single sim only :

PhoneManufacturerModelName " = RM-984

honeModelName = Lumia 830

PhoneHardwareVariant = RM-984

13- Download windows insider and roll in

14- now due to checksum computing during updates you need to Disable root access (BUT DO NOT RESTORE BOOTLOADER). so get back to Windows phone Internal and Disable root access. then rebbot and get back to normal .

15-check for update first one will be preparation and at secent you will get Windows 10 :laugh:

NOTE : your bootloaer will remain unlocked no problem till now BUT if we get any update to change anything to Secureboot then we are probably going to have our devices broken.

M and F