@fremangordon
thank you for your explanation.. so, using the old kp48's working profile, removing 700 and 750 mhz it should work?
.....this is what i have done, but i have problems playing any video file and excessive battery drain.

RUNNIG PROFILE:

MINFREQ=250
# kp48 MAXFREQ=750
# kp48 FREQS="0:25,90 125:25,90 250:33,180 500:40,400 550:45,430 600:46,500 700:48,500 750:50,500 805:52,500 850:54,500 900:60,500 950:60,500 1000:60,500 1100:72,520 1150:72,520"
# kp49 MAXFREQ=805
# kp49 FREQS="0:25,90 125:25,90 250:33,180 500:40,400 550:45,430 600:46,500 720:50,500 805:52,500 850:54,500 900:60,500 950:60,500 1000:60,500 1100:72,520 1150:72,520"
SMARTREFLEX_VDD1=1
SMARTREFLEX_VDD2=0
GOVERNOR=ondemand
UP_THRESHOLD=85
SAMPLING_RATE=300000
IGNORE_NICE_LOAD=1
POWERSAVE_BIAS=0

SLEEPING PROFILE:

MINFREQ=125
# kp48 MAXFREQ=250
# kp48 FREQS="0:25,90 125:25,90 250:33,180 500:40,400 550:45,430 600:46,500 700:48,500 750:50,500 805:52,500 850:54,500 900:60,500 950:60,500 1000:60,500 1100:72,520 1150:72,520"
# kp49 MAXFREQ=250
# kp49 FREQS="0:25,90 125:25,90 250:33,180 500:40,400 550:45,430 600:46,500 720:50,500 805:52,500 850:54,500 900:60,500 950:60,500 1000:60,500 1100:72,520 1150:72,520"
SMARTREFLEX_VDD1=1
SMARTREFLEX_VDD2=1
GOVERNOR=ondemand
UP_THRESHOLD=85
SAMPLING_RATE=300000
IGNORE_NICE_LOAD=1
POWERSAVE_BIAS=0


any suggestion?

EDIT:
in fact, with kp49 i have no stability/hangs/reboots problems, but the battery drain it at least twice if compared with kp48 (measured with battery-eye) and i'm unable to play any video file...(while with kp48 there is no problem at all)