Invalid flash mode (s) (boot failure) + bootloop

Hi all, I'm new in this forum but i read a lot of your thread in order to learn about android phone.

First of all, sorry for my bad english.

I have a problem with my razr maxx. I bought it on ebay (a used one). I use Razr/Maxx XT912 (Matt Droid Razr Utility) and now the phone is in bootloop.

This is the error message:

invalid flash mode (s) (boot failure)
0A.77
emmc info: seize 16gb
Device is LOCKED. STATUS CODE 0

battery ok.
ok to program
transfer mode:
usb connected

AND

Invalid cg otv (CG:system): invalid sp data
invalid cg version (cg:system)
invalid cg otv (cg:system)

I'm trying to resolve with this old thread http://xdaforums.com/showthread.php?t=1524011

My phone model is xt910 type name m0c2e fcc id : ihdp56me2 ic id 109o-p56me2 and it has verizon apps. (i red the it on the back of the phone) BUT I also use the imei in the motorola's support to find out the model of the phone, and this is the answer: XT912 (Spyder LTE) (i also find a screen of the phone with some info -> see the attachments ). [the phone is only with motorola brand].So which is the right model? I also have (or better had) supersu already on it. I use it with a sim card (i use it with in gsm mode but it has also cdma mode. The languages are only spanish and english )

I arrive at this point ( from this "guide" http://xdaforums.com/showthread.php?t=1524011) http://xdaforums.com/showthread.php?t=1362956 but i don't know which one i must download.


ps.
i also tried:

1-download cdt.bin ( http://www.mediafire.com/?ua1nj6ds6r0vtue )
2-download fastboot files ( http://dfiles.eu/files/bih3tmg7b )
3-restart your phone in to bootloader ( fastboot ) mode
4-connect your phone via usb cable
5-open cmd.exe in your pc an go to fastboot files
6-flash cdt.bin via this command -------------------------------------- fastboot flash cdt.bin cdt.bin
7-restart your phone in to stock recovery
8-do triple wipe and restart your phone

and you can see the result in the attachments..


What can i do in order to resolve the bootloop? I'm desperate

Thank you

i'm trying but it failed. (usb error at status 22/24 and 18/24). Now i repeat the action. I have the original cable and the phone is in fastboot flash mode

It's working ! THANK YOU!!!

In order to avoid the same problems, How can i change rom? (which one can i use ?) Which programs and apps do i need to use? Where i can find a guide? Which is the best way in order to improve the gsm signal?

Thank you,
Roncallica

An other idiot question. Now it is without supersu and it is locked. What can i do?

Do i have to use this guide? I mean in order to root xt912 http://xdaforums.com/showthread.php?t=2230140 or can i use this one? (http://www.youtube.com/watch?v=YIEO0pedtzE). Can i modify kernells and radio in order to obtain more gsm signal? i don't find a safe recovery for xt912 spider, what can i do? I have some problems with internet and it's a bit slow

thank you!