Lak7,
Firmware 5209 is the most recent which tried to address the YouTube glitch. That sounds right from your description as I noticed that the signal level and quality level response were extremely slow to "pop" in. I didn't like this and I wasn't really concerned with the YouTube thing anyway, so I did switch back.
The DiSEqC 1.2 troubles apparently exist with all versions. However, I have a suspicion that this is partially our error as the "end user" and partially a frailty or programming problem from OpenSat. The way "we" want to use the AZBox, like we are accustomed to with other STB boxes, doesn't play well. If you use the editor programs, much of this goes away, but it still isn't perfect in my opinion. I didn't stick with the 5209 version long enough to test and verify if it was worse than the 5020 version, but I would certainly take your word for that if that is what your experience was.
Regarding firmware upgrades: If you are going upward in version and OpenSat does not specifically state that there is a change in the network services features, You should not witness a change in these settings UNLESS you perform a FORMAT APPLICATION AREA. If you simply upgrade via USB, you should not detect any settings alterations in this respect. They should all remain active and retain your personalized settings.
If you go in reverse (return to an older firmware version because you do not like the newest one that you installed) I have to question whether it will be required to perform the FORMAT APPLICATION AREA in order to truly return the box to the previous revision and especially when attempting to return to a much older one. I am quite sure that going forward (unless otherwise specified by OpenSat to do so) you can just load each new version upon the other and keep advancing as each firmware builds upon the previous versions. However, when reverting to past versions, I don't know if the same, simple process completely removes all the aspects of the newer versions so that you truly arrive at a "virgin" aspect of the older. I will try to find clarification on this from OpenSat directly, if I can.
RADAR