Update: Today I received the receiver. Overall it makes a good impression - with one exception: the WiFi antennas are more slack than fixed in the housing, but I can't fix it without breaking the warranty seal.
At first I prepared a USB stick according to this
Howto, and booted directly to the OpenViX recovery image process. Everything went fine until step 14 in the Howto (flashing , because the system didn't recognise the image file openvix-6.4.002.release-sf8008_mmc.zip in the root directory of the FAT32 file system on the USB stick.
If I understand the Howto correctly, the steps 14 and the following are only needed for multiboot.
The setup for satellites and channels was easy (at least at the second attempt - after I connected the antenna cable from the LNB
).
I've got the WiFi to work - at 2.4GHz only. But is was sufficient for a HD stream and my parents live in the outskirt of a really small village with and that I don't expect much disturbances and interferences with other services at the 2.4GHz frequency range.
Streaming to the dreamdroid app worked perfectly.
After that I logged into the system via ssh and tried to sleuth whether the image file on the USB stick has got some obvious problems like a different size than the downloaded file from
https://www.openvix.co.uk/index.php/downloads/octagon-images/sf8008/.
That wasn't the case, so I tried to flash that file via the menu entry - and everything worked, including booting that image.
In the end I've got a functioning receiver. That's very good.
E.