which software use to flash *.skd file for Sky IM phone ?

i 've had Astool but can not use this software for flashing Sky im-6100 CDMA phone. Why ?

My Sky IM-6100 with version s0126153 check sum 0E0E
i search for s0126153 but may be it is for SK-6100 the same as IM-6100. so it is reason i cannot flash successful
or may my Astool not full version

any adviser please help me