I noticed that screencap & screenshot are not on this phone in /system/bin/ while this is the case for the 2.3.6 phone and the 4.x tablet.
I copied it over from the 2.3.6 and first got a permission denied error on the command in post 1.
Changing the rights to execute (777) gives
c:\Program Files\Android\android-sdk\platform-tools>adb shell screencap
link_image[1995]: failed to link screencap
CANNOT LINK EXECUTABLE
Any idea?
Weird thing is that the BACK+HOME combo is taking screenshot and writes it to the SD.
Is this using a custom method compared to the ADB/B4A one?