SamyGO

Actualy steps 1-12 help you to install custom firmware you want (w/o restrictions of samsung)
Here is no DTS or any other samygo game on firmware you install via this method. You can install official firmware for your TV from samsung download site, but not the latest, just a bit earlier, e.g. T_CHU7DEUC-3000.G., or you can install patched firmware too if you want.
After you downgrade your firmware, you be able use all samygo applications, i call it "games" because of run place on TV.

Now about your blue-questions:

2. Your model is OK.
4. Onwiki we have some original samsung sources. Not patched. Just direct path to samsung download site.
Your link is:

T-CHU7DEUC - 3000.G
SWU_T-CHU7DEUC_003000_I02_ES000DS000_091111
http://downloadcenter.samsung.com/conte ... U7DEUC.exe

7. You can skip this step, but it is better to do for safety, if you brick your tv, w/o those files restored you be not able restore tv oer ExLink cable. Files to download are in step 7. (u-boot.bin, fnw.bin, Image for UExxB7xxx, UExxB8xxx) extract files to your USB key in directory /T-CHU7DEUC/image, here you find all other firmware files.
10. Plug in USB with firmware you prepared. "game" i ment "FFBv0.2" samygo game. OK?
11. Run from, children, but be sure that yu run it from ContentLibraryManager-Children, not from ContentLibrary-Children. Look at step 9.
13. DTS is not firmware, it is an application you be able run from Games on TV.

After you downgrade, you be able use DTS "game" whitch lets you play DTS by downmixing only. No optical output of DTS.

It is your choice.
Maybe sometime anyone makes application to watch DTS movies not downmixed. You can try run DTS game as modification of samygo troja horse, without to downgrade your firmware. Just extract DTS archive to subfolder of Telnet enabler, copy to TV and run it from Children in ContentLibary Manager.

nimasun,
it seems, you run game from wrong location on TV. it freezes if game runs from ContentLibrary Children and it must be run from ContentLibraryManager Children. Check description again.
I suggest to read this. place files from archive to USB to avoid bricked TV. http://forum.samygo.tv/viewtopic.php?f= ... =160#p9080

by this way you can roll back directly to patched 2005 firmware. Obligatory place u-boot.bin Image and fnw.bin to USB as described. you must do it to have chance restore TV if you brick it. good luck