[Windows Phone 7 Development and Hacking] surya467:
First of all this is not my work, i was not able to the team with this, but i was following everything and have a heads up as well..

Note : Links Updated

biktor_gj over at XDA along with ULTRASHOT managed this.

NOTE : IF YOU HAVE A LUMIA 800 WITH QUALCOMM , PM ME

Second : IF YOU HAVE NO IDEA WHAT YOU READ PLEASE DO NOT TRY THIS!

GET IN TOUCH WITH ME OR A MOD, WE WILL HELP YOU.

I CAN TRY TO HELP YOU REMOTELY BUT WE'LL NEED TO ADJUST THE TIME.

Third : There is some risk in this if you dont do it correct by yourself, myself and no one is responsible for your device.

This is all under your own risk.

Even if we help you i tell you till now i havent nor any of my friends havent bricked a phone.

To make sure, we are well aware of how this works.

You need Something called as a Qualcomm on 800 and 710

For a 710 device , any 710 can be unlocked, even if it has a DLOAD.

For an 800, only a device showing up as Qualcomm can be unlocked.

A DLOAD in 800 cannot be unlocked as yet.

To know what type of Loader you have follow this :

Open device manager in you PC (Just so you dont miss the driver installation, its better view able in Device manager)

Power off your phone , dont plug the USB as yet.

Hold VOLUME UP button and plug the USB in the PC.

Check device manager.

You will have a DLOAD or a Nokia cable connectivity or a Qualcomm technology.

In case of DLOAD and Nokia cable connectivity. Nothing else will be noticeable.

If you get a Qualcomm, u will get a box to format Disk, say NO!

SO now

Qualcomm = unlocked bootloader

DLOAD = Locked bootloader

* UNLOCKED BOOTLOADER = NO NCS = YES CUSTOM ROM

* LOCKED BOOTLOADER = YES NCS = NO CUSTOM ROM

For Lumia 710 users, u need to flash a Qualcomm bootloader (Unlocked bootloader) to enable Qualcomm , so u can Full Unlock your device.

If You have DLOAD, follow the full tuto.

IF you have a Qualcomm, goto step B.

[glow=red,2,300]Important : Flashing a CUSTOM ROM, to full unlock your phone will need a HARD RESET , in which you will loose all your data.

I would recommend you back up all your data, mostly just sync your pics and stuff of you PC and sync your contacts to your LIVE ID.[/glow]

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A.To install Qualcomm Bootloader in Lumia 710:

http://www.youtube.com/watch?v=N9kM0hDMgWA&feature=youtu.be

1.Download the new version NSS

http://www.mediafire.com/download.php?rjn2ffwau8drfnn

2.Extract to a folder, start the program.A folder named "loaders" will be created in the NSS folder.

3.Download this : http://www.4shared.com/rar/RmIuS9gP/qualcomm_bootloader_files_for_.html

4.Insert the 2 loaders from above link in \loaders\special\wp7\

RM803_12w07_prod_generic_nokia_osbl.esco &

RM803_11w48_prod_raw_nokia_osbl.bin

5.Install these drivers:

http://www.4shared.com/rar/W5cHhg6V/winusb_drivers_x86.html for 32 bit users

http://www.4shared.com/rar/Iz4Y5JEm/winusb_drivers_x64.html * for 64 bit users

6.Now select "Nokia USB Connectivity" in NSS in the white box.

6. Go to Flashing->WP7 Tools->Install.

DONE.

Now you have an unlocked bootloader, so u can flash a custom ROM.

head to 2nd part.

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B.To flash a Full unlocked rom in Lumia 710:

Before flashing i would suggest you use this : http://xdaforums.com/showpost.php?p=25126572&postcount=642

so you dont have to go through for the activation code.

http://www.youtube.com/watch?v=RV-CkXFz3ZI&feature=youtu.be

1.Download any of these Custom ROMs

RainbowMod for Lumia 710 [Updated 28.07.2012] : http://xdaforums.com/showthread.php?t=1654415

Rataplan V1.0 - WP 7.8 for Lumia 710 All languages : http://xdaforums.com/showthread.php?t=1937317

Lumiatrix 5 - [WP 7.8] - [ALL LANGUAGES!!] by vova1609 : http://xdaforums.com/showthread.php?t=1899973

2.Extract both the files in same folder (select both rar files and right click>extract here)

3.You will get a file new-os.nb

4.Open NSS PRO

5.Go To Flashing - >WP7 Tools

6.Power on Phone normally and connect it using USB cable.

7.Let Windows Find your phone with correct drivers.

8.On Bottom - Left choose Nokia USB Connectivity.

9.Click On DETECT

10.Select "Normal Mode", "OSBL Mode" from the dropdown boxes.

11.Now click on "OS File" and choose the ".NB" file you want to flash.

12.Click on "Write OS".

13.Wait till it flashes and then when it says done, unplug your device and remove the battery.

Now reinsert and switch on.

In case your phone is not detected by the PC,

Run NSS PRO as administrator

Power off your phone and disconnect the USB from the PC

Now hold volume UP key and plug it into the USB

Then you should be able to Write OS perfectly.

14.While entering LIVE ID during setup it asks for activation code.

Go here HERE

Chat with them and ask for activation code and enter it in the device and proceed.

I am not responsible fro any damage done to your device, you take all responsibility for what you do.