good news for everyone. I found a solution for our problem: after my cable arrived last week I tried it out and it finally worked! as you can see in my attachment, the input plug from the ugoos cable (right) is slightly longer than the one of a normal av cable (left):

but I wasn't satisfied with the image quality of the av out (its only 576p with PAL, the image was very fuzzy and blurry) so I decided to give it another shot with the hdmi out and bought an hdmi-to-vga-converter cable on **** (11 €):
http://www.****.de/itm/301009635137?...84.m1497.l2649
it has an active electronic which converts the digital signal from the hdmi to the analog vga. my video projector downsamples the the box's resolution (1080p) to its native resolution (1024x768). now it looks perfect.
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