Pokemon Black exp fixed rom test on original R4 firmware: Wood R4 1.12. Updating this post every couple of minutes,Stay tuned.
started it on Wood R4 1.12 and so far it works, saving works, will tell whether it freezes and what not. Just beat the first battle in my house and it is still works. Beat the second battle and still no freeze, my pokemon leveled aswell. Gone outside of my house, no freeze as of yet. Saved and restarted DS continues from my save so the save file is working. Now watching a tutorial of the professor or whovever catching a wild pokemon, no freezes yet. My first encounter of a wild pokemon, killed it and no freezes.
Encounterd another wild pokemon, caught this one and no freezes yet.
Going into Wifi settings and then exiting it works without freezes.
Not going to report on wild pokemon battles because it seems they work.
I just answered, what I believe to be, a 4 way phone call and still no freezing.
Able to use sleep mode on the ds without a single freeze.
Gone to the pokemon centre and healed, still no freeze