Hey guys. I have a UDP-203 bought brand new in May 2020 for AU$1000 + shipping. Glad to see that they're going up in price (current market value here is AU$2200) but it certainly made me hesitate before attempting this jailbreak!
I have been happy enough with using the SuperDisk, and I ratted a region mod out of an old and unused BDP-93 so wasn't really worried too much about foreign BluRay discs either. But when I set up a NAS on the home network on the weekend I knew it was time to take the plunge.
Procedures followed:
0. Read everything in the first few pages multiple times.
1. Upgrade firmware from 60-0625 to 65-0131
2. NAND backup of AU version.
3. Upgrade by manual method.
4. Could not access the Oppo with Telnet.
5. Apply overlay files, now both Telnet and SSH work.
6. NAND backup of RU version and compare.
At this stage everything just works, apart from the myriad original Oppo bugs that they didn't ever iron out while they were in business. I tried all my BDs but even those marked as Zone B Only worked in every zone setting, which is fairly common in Australia. I've ordered a specifically known foreign disc to test this but I'm sure it will be fine. And now I don't have that ugly dongle sticking out of the RS-232 port either. Only issue I can think of is that the bdpprog_au file hasn't yet been posted so I can't revert to the AU version easily, but I can't see an immediate need for that and I doubt this unit will ever be sold.
I have an M9203 on order from Rong too, and that should arrive in about a week, so it's nice to have a bit of knowledge about the internals of these things. Thanks to all who contributed, great work.