I cannot answer your question because I don't know if they JB every official version or not. I may be wrong but I do believe those people are not so hardworking enough to JB every official version.
They get our $$ once and have less incentive to do JB for every version as it involve more work loh !! I will NOT be surprised if the UDP-203 only get maybe 1 or 2 JB (lucky if got 3) versions after you paid RM250-320 for the JB.
And then... when UDP203D released, the new JB won't work on UDP203. That's what happened when BDP-105D JB was released which cannot be used for BDP-105 because its not compatible !! I know because I bought the 105 demo unit at a very cheap price BUT found out that the new JB don't work properly so I had to return it and exchange it and pay extra for a new 105D !
I bought my 105D in January 2015. The "Darbee" model was released around 2014 and only got 1 JB version for the 105D when I bought mine in 2015. Then around December 2015, they release the SECOND JB !! My JB is out-of-date, behind a few versions of the Official Release.
I do believe that the JB firmware IS actually done by people inside Oppo itself but "done unofficially and secretly" because they don't want to lose their precious bluray license !! They were "forced" to put CInavia into their players when it becomes compulsory since 2013.
There's nothing we can do about it for people who wants Cinavia Free, Region Free, can play BDMV folders and BD ISOs for backup copies of own genuine discs. We can choose not to do backup rip and play direct from genuine discs BUT risk the wear and tear on the disc which can get spoilt. Any spoilt disc is not replaceable when its no longer sold later !!
Without JB, of course we can just copy the M2TS file to the harddisk to play with Oppo BUT not all blurays put the entire movie in 1 single file. Many blurays have the movie split up into many different M2TS files BUT may not be in the correct number order!! So we have to rip using the correct playlist to a single file and THAT involve a lot more work... many people don't even know how to do it too. I may not even know which is the correct Playlist file to use to join the "chapters" correctly into 1 file. Ripping to BD ISO is so so so much simpler!
Don't forget...whatever we do to "backup" our discs to harddisk such as MKV, MP4, M2TS, BD ISO, etc etc... the Cinavia virus still there without JB.
I thought the same firmware should be applicable to various model? refer below link