I can confirm that flashing the XXAMB6 modem will work. Because all the warnings I read everyhwhere I didn't try this with XXAND2.
-First I flashed CWM to the phone, reinstalled CWM to the Vanir suggested CWM.
-Next rooted the phone with SuperSU.
-I flashed the S7710XXAMB6_S7710OXXAMB2_NEE (from sammobile.com) image to the phone usin ODIN.
-Booted to recovery, wiped all userdata and then dalvik cache
-Flash the newest vanir (4.4.4.090814)
-Installed the pa_gapps pack
-And then again reinstalled SuperSU from zip
There are steps that are redundant, but since I am a newbie on Android, I just write this to help others.
I would post this to Vanir main thread, but because I just joined I cannot.