[Windows Phone 8 Development and Hacking] H3Aket:
This Is a Written Tutorial On Unlocking Lumia Bootloader and flashing Custom Rom.

While This is Just a Written Tutorial Of using windows phone internals I am Just Providing Its Tutorial.

All Work Is Done By HealthCliff,

He Is Owner And Creator Of WindowsPhoneInternals.

Features Of Unlocking BootLoader,

1.Enable of root access.

2.Installing Any Custom Rom.

3.Customising Phone.

4.Access Of System Files.

5.Interop Unlock (Deploy Unlimited xap,appx)

6.A way for HomeBrew Apps.

Warning:This tool may cause irrevocable damage and/or data loss when applied to any target device. As such please ensure that you fully comprehend and accept the Disclaimer and warnings before proceeding any further.

Means That This Can Really Brick Your Lovely Wp Device, The Developer (HealthCliff) Or anyone is not responsible For any Damage caused to your Phone. You are all responsible for every action You take.

Supported Phones:

Lumia 520, 521, 525, 620, 625, 720, 820, 920, 925, 928, 1020 and 1320 are supported. These bootloaders can be unlocked.

Supported OS:

8.10.12393.890

8.10.12397.895

8.10.14219.341

8.10.14226.359

8.10.14234.375

8.10.15116.125

8.10.15148.160

10.0.10512.1000

10.0.10536.1004

10.0.10549.4

10.0.10581.0

10.0.10586.11

10.0.10586.36

Requirements,

1.WindowsPhoneInternals -Get It > here.

2.Windows Device Recovery Tool - Get It > here

3.SBL3(Optional But Required) - In attachment

4.Compatible FFU Image For Your Phone.(You Can Get It with Windows Device Recovery Tool or WDRT.)

5.Drivers(Installed With WDRT).

6.Lumia Emergency Flash Loaders - You will Get It from here.

The Tools And Resources At No. 3,4,6 Differ From Phone to Phone So i WIll Tell You How To Get This All.

Preparation:

1.Installing Windows Device Recovery tool:

1.1: Download Tool(Link in Requirement Area).

1.2: Install It.

1.3: Wait Until It Download And Install All Required Drivers.

2.Obtaining A FFU Image.

2.1: Connect WindowsPhone To Pc via USB cable(Data Cable).

2.2: Run Windows Device Recovery Tool And Select Your Phone.

2.3: Click On Reinstall/Install Software Button.

2.4: Let It To Download And Flash Your Lumia.(Note: FFU Images Are Greater Than 1 GB, So Download Can Take Great Time)

2.5: Once Flashing Done Look For FFU File in C:\ProgramData\Microsoft\Packages\Products\<Your RM Version>\<ProductName>.ffu\

2.6: Copy And Backup That File To a Safe Place.

3.Engineering SBL3.

3.1: Look For Attachment I Have Provided SBL3 Of all lumia phones in Just a zip!!

3.2: Download And Extract It.

3.3: Look For Your Phone's SBL3 And Backup That file to a safe place.

4.Lumia Emergency Flash Loaders.

4.1: Connect Phone To PC.

4.2: Open WindowsPhone Internals.

4.3: When It Will Detect Your Phone It Will Show Some Information Of Your Phone (Under General Info Tab)

4.4: Note Its Brand/Model And Product Code As SHown In ScreenShot.

[IMG="WindowsPhoneInternal"]http://i68.tinypic.com/wkk9oy.png[/IMG]

4.5 :Go to http://www.lumiafirmware.com/ and Click on Your Phone Compatible Tab. Like For me Its Lumia 625 RM-941.

4.6: It will Give you many Codes Select One That is exactly matched with your Product Code Found with windows phone internal.

4.7: Download Hex/bin File And Backup It.

Real Instructions,Finishing Up

Now its time to unlock your boot loader and Enable root access,

Make Sure You Got All Necessary Files.

1.Unlocking BootLoader.

1.1: Connect WP to PC via Data Cable and Run WindowsPhoneInternals.

1.2: Tap On Manual mode then Switch to Flash Mode.

[IMG="ScreenShot"]http://i68.tinypic.com/syl65l.png[/IMG]

1.3: Click On Unlock BootLoader And Load All Your Resource(FFU,Hex,etc)

1.4: Click On continue And Wait Till It Unlock Your Bootloader with sbl3 enabled.

1.5: Wait For Success Message And Your Bootloader is Unlocked.

2.Enable Root Access

2.1: Go To Root Acces Tab.

2.2: If You Have Selected sbl3 in Booting Process Then Just Click on Unlock Phone Button in Enable Root Access directly on phone section.

2.3: Done Now enjoy.

Part 2:Flashing Custom Rom

To Flash custom Rom get one for your phone and follow this procedure but please you need to unlock bootloader first in order to install custom Rom.

Installing Custom ROM:

1.Go to Flash section of windows phone internals.

2.It will reboot you Wp to Flash Mode and ask you to select Rom just select it

3.Hit the button and allow it to Flash (takes almost 25min).

4.It will reboot and enjoy your custom Rom. :)

Fixing Bricked lumia

In Case if you bricked your device :( you can just follow my new post it maybe can help you.

Take steps given in this article to try to solve most bricked lumia device.