Hmm what is the H30?!?! =) I'm beginning to think you are referring to the XP30!
You may have to burn a certain format, which I think was brought up before but in a completely differnet forum(I forgot but I did see something about it).
Reguarding checking the firmware, it's listed on the start thread(also appies to 1600). The display won't say 0 but most likely it will display the unit's default region number.
In my case, my R3 RP-82 unit displays Region 3 as it's default region, but since I always play R1 that indicates it's region free.
My RP56(R1), when it was made region/macrovision free with the SVC Disc #2, saids region 1 and I do have an R3 disc and it plays them just fine. Werid thing I noted is after the firmware upgrade, I re applied the SVC Disc again and then the unit's default region jumped to 2 instead, but it can still play other regions and macro is still there so there is nothing to worry. I might try to fix it if there is a way(stay tuned!!).
If you really want to know if your unit has a mod, open up the case. After opening, you will find a chip which is add-on to the daughterboard of the unit and you will see cables going to certain parts of the motherboard.
Once again I do remind you that the firmware is for stock units only.
Hope this helps