Okay all.
Heres a simple tutorial for changing your CID.

Changing up is easy. Down not so easy.

CID's - 36 (old) 49 (old) 50 (mainly w810) 51, 52, 53 and now there is CID 80/81.

Changing up.
There are various ways of doing this.
1. SEUS. - This is simple and endorsed by SE. It will update you to the latest FW version and latest CID (usually 53) available for your handset. Most people will not want CID53 as its fairly useless for modding and home flashing. For this you want CID 52 or lower (CID 50 aint too good either...)

2. Connect your handset to XS++3.1 - If your handset is supported and its not CID 52 then the program will automatically ask you if you want to update to CID 52. Click yes and the program does all the work. Simple as that!!!!

Changing down.
Okay, This is slightly harder and will require a paid solution. I used D-Ultimate unlocker. Credit will cost you about £18 altho you can use it multiple times.
Follow the procedure outlined below.
1. Download and install the program (available from CLICK HERE)
2. Input your user name and password on the settings tab from within the program and click save.
3. On the job tab select your handset and what you want to do with the handset. I had a CID 53 K770i locked and vandalized by vodapoo so I selected direct unlock and change CID to 52.
4. Connect your phone holding 2+5 and the program should do the rest. It will ask you to disconnect and reconnect several times.
5. Voila - Unlocked and downgraded CID!

I had a problem getting it to run, but then realized I had old USB flash drivers installed. You need version 2 or above for the software to work!

And iv been able to mod and customize using xs++ following the procedure. I'll keep my credits for use on further handsets!!

good luck!

PS I am in no way affiliated with cruizer team - they do a great service and I think this deserves some credit!

... waiting freeway to Changing down CID53 .....

Dont have freeway yet i'm sad!!!
And if you atualized with SEUS your phone can be a CID53 and then dont work patches and other modded.

For more information see this:
http://forums.se-nse.net/index.php?showtopic=34704

D-Ultimate Unlocker credits could be bought at www.ultimateunlocker.net or www.d-unlockerserver.com @ Euro 28

can i upgrade from CID 36->CID 49?

I release this one time with script.
http://forums.se-nse.net/index.php?showtopic=34704

Buy supreme credits from http://www.cruisersuite.com/default.aspx?c...uy_csca_credits
and you will get them for 15 euro instead of 28 euro.

If u want downgrade cid 50 in SE W810i it is impossible...Because opt cid is 50 so u can not change cid to higher or lower by using any programs:(

It's for CID 49->CID 52/53, mine is a K750, i want turn the CID36 to 49..

Do you tried?

Why when the most relible firmware for w800 (if you want to flash your k750 to w800) is for CID36?

I have CID 50 k320@w200 and when i connect the phone to XS++ it doesn`t ask me to update the CID . I want to update the CID to 52