[Nokia Lumia 800] biktor_gj:
UPDATE: First custom rom with Interop Unlock flashed succesfully. Requires hard reset after installing and an unlocked bootloader. See post for proof:

http://xdaforums.com/showpost.php?p=24818275&postcount=242

BIG THANK YOU TO ULTRASHOT!

Without you I couldn't have done it!

NOTICE: Testing full unlock (XIP unlock etc) with ultrashot. Will post new files as soon as I get a working build which doesn't get stucked on boot ;)

Disclaimer:

I AM NOT RESPONSIBLE IF YOU LOOSE DATA, BREAK YOUR PHONE, OR SET YOUR HOUSE ON FIRE. DO THIS AT YOUR OWN RISK. BTW, REQUIRES A HARD RESET SO YOU WILL LOOSE ALL THE DATA IN YOUR PHONE BY FLASHING THIS. IF UNSURE, DON'T DO IT.

PLEASE STOP PM'ING ME FOR HELP, I CAN'T REPLY 20 PMS/HR. Please use the forum, maybe someone can create a discussion topic to help others and leave this for links and development. Thank you very much!

PLEASE STOP SENDING ME PMS ASKING FOR HELP AND USE THE DEDICATED THREAD

THIS THREAD IS FOR DEVELOPMENT ONLY, PLEASE RESPECT THAT AND USE THE Q&A THREAD FOR YOUR QUESTIONS.

LINKS:

Lumia 800: Full Unlock

New firmware: May 16, 2012 (removed foursquare and stuff)

sdb3.rar: Flash it to PARTITION #3. It contains 12070's amss & adsp. Not absolutely required but if you have an older version this should give you better battery life.

http://www.mediafire.com/?kwjladlgvq81rha

OS-NEW:

As always, flash it to PARTITION #9.

Part1: http://www.mediafire.com/?21by2oj7acnhkhw

Part2: http://www.mediafire.com/?wkeduvp9l4199qh

Part3: http://www.mediafire.com/?cnbkms40dy4y06z

Part4: http://www.mediafire.com/?rabunpmnaqclq3o

Complete Mediafire folder access: http://www.mediafire.com/?uo2dqcl34b9cy

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Alternate ROM with Full Unlock + Some apps:

Part1: http://www.mediafire.com/?8gnqm418v32im3e

Part2: http://www.mediafire.com/?bgtg2t5infrnua1

Part3: http://www.mediafire.com/?l0sl5hbr0v9gfi1

Part4: http://www.mediafire.com/?emt2dfswdhn0z0w

Apps preinstalled:

DS Supertool

File Deployer

Metro Theme

WebServer

WinTT

WM Device Center

WP7 Root Tool

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Lumia 710: Interop Unlock (no full unlock yet)

ROM Based on: RM803_059N2L6_1600.3015.8107.12070_010

Mediafire folder access: http://www.mediafire.com/?9z6og65ozgrnr

http://www.mediafire.com/download.php?d3bj3dkfbffbakn

http://www.mediafire.com/download.php?l35zjaebdrsm315

http://www.mediafire.com/download.php?ys5bapu8ubezybo

http://www.mediafire.com/download.php?tnadd4uuoxhatv3

CAUTION: I don't have a 710, so these images AREN'T TESTED. Use at your own risk. Be careful, people are reporting problems with this rom.

Full Unlock Image for Lumia 710 by lucifer3006 -BE CAREFUL, IT HAS BUGS, FOR TESTING PURPOSES ONLY- (thanks ultrashot & lucifer3006): http://www.mediafire.com/?p3318y5l19abb

You have a mirror of all the stuff on mediafire on xdafil.es: http://xdafil.es

Thank you mousey_!

PLEASE DO A FULL BACKUP OF THE NAND BEFORE PLAYING AROUND.

If you are developing fixes for the bootloader 'problem', feel free to grab a copy of the rest of partitions and stuff I posted over this thread here: http://www.mediafire.com/?kknt4lnc3tn7w

INSTRUCTIONS:

Requires an unlocked bootloader (a.k.a. qualcomm development bootloader).

Easy to check: Turn the phone OFF, then press and hold VOLUME UP + POWER until you notice a short vibration. Plug in to the computer. If the phone turns up in disk mode (USB Mass Storage Device), then you have an unlocked bootloader. IF you're in Windows, it will ask if you want to format the disk. SAY NO OR IT WILL EXPLODE (it won't explode but you might break it)

If the device detected by the computer is Nokia DLOAD you have a locked bootloader and you're out of luck, at least for now.

I used 'dd' in Linux, I guess you can do it with Windows version too (http://www.chrysocome.net/dd) but it's more involved to find the appropiate partition:

dd if=./os-new.nb of=/dev/sdX9

Where X is the disk detected by your linux distribution.

After that, you'll need to hard reset the phone. Hold Power button for 10 seconds to exit Qualcomm's disk mode, and press and hold POWER+VOLUMEDOWN+CAMERA until you feel the phone vibrate. After that, RELEASE power button but KEEP HOLDING volume down + camera for five or more seconds. This will trigger the hard reset.

Now time to play with bootloaders and try to get this to work for everyone!

If you like my work and want to donate for a beer (or two), follow this link