Hi Babadem. Seems like we are both in the same boat -- mine worked fine for 18 hours or so after the firmware upgrade...and yes, I also tried to upload my user .udf files. However, when I did that, it didn't look as if it loaded correctly (first time that's happened since I've been using the microHD ALI editor), so I just reloaded the default back onto it. But mine didn't stop working right away. It worked without a hitch the rest of the evening and the next day...even scanned several sats. After I blindscanned 127W, the screen froze and the cycling started. Most of the time, all it shows is the boot logo before cycling off and on again. About 5% of the time, it would show an info screen for Guatemala 27 at the bottom, but no picture and no access at all to anything...I have to unplug it, and when I plug it back up, the endless cycle continues.
I've ordered the converter, but it seems like the 3.3v is coming to me instead of the 5v
Let me know when you get yours working again