Okay i have found the solution ! but i take no responsability if you brick your phone !
My device is an XT925 ! from Rogers Canada !
I never lost IMEI during this downgrade ! Your bootlader must be unlocked !
1 : Charge your phone !
2 : Download the DROID RAZR HD Utility 1.10 - http://forum.xda-developers.com/show....php?t=1970267
3 : Go to fastboot...
4 : Downgrade ( yes is for XT926 but it work for XT925 )
5 : Go to fastboot don't let android start ( push 10 seconds power on - vol- - vol+ if the verizon logo start ...the phone shutdown go back to fastboot )
( i don't try to start the phone with the xt926 rom... )
6 : Download and flash via rsd the rom you want ( work great with O2 and LATAM retail )
( off topic : latam retail have only 3 language ... English spanish port...)
7: Downgrade security error ? or get var error ? Edit the XML Inside the rom : delete the 2 get var line :
<step operation="getvar" var="max-download-size" />
<step operation="oem" var="fb_mode_set" />
and delete :
<step operation="flash" partition="partition" filename="partition_signed" MD5="0c0917493a29c487f87434a0997c3048" />
8 : Enjoy your ics stock rom...
9 : Upgrade to Jelly Bean if available and if you want
ROOT ALL JB ROM ( and ICS rom )
No need to use OTA rootkeeper when bootloader is unlocked !
and Flash SuperSU Via CWM
Need LTE on JB rom ?
Flash via fastboot your modem and fsg...
fastboot erase modemst1
fastboot erase modemst2
Fastboot flash modem modem_signed
Fastboot flash fsb fsb_signed
I really love the o2 ROM... no bloatware...Fast... many language ( french ... arabic... etc )