Hi, I came acros this post whilst investigating an error with DSX firmware v 1.009. When in the app (Android), it has a message on main screen announcing firmware is available, however when I try to download the update, it says "firmware not available". I've also tried it on my tablet with the same message - very annoying as the app won't let me change any settings until the firmware is updated!
Also, the first post on OC not displaying tank pressures; I initially had the same problem. The solution is; when you switch from SM to OC mode, or vice versa, you need to completely set up the transmitters again, especially in *set menu / set gases menu, where you need to tell the DSX which transmitters you are using & gas type. It's a real faff to do this, but it works once set up.
One other issue I have with the DSX is it will only show one tank pressure in OC mode. To check the other tank (if using twins) you need to go into gas switch. Or, alternatively, use SM mode, then both tank pressures are on the main screen.
I personally think this is a serious omission, and I've no idea why Apeks wouldn't have both tank pressures on the OC screen?
Hope this post helps others, as the section in the manual for setting up transmitters is really poor.