No, you won't be able to play it. Because as soon as you put the UMD in, it'll ask you to update to 5.55 firmware in order to play the UMD.. As soon as you do that, goodbye CFW...

Now i'm not sure if you can re-flash the 5.55 OFW back to CFW.. I think you can, i think i've done it before on a friends PSP with a pandora battery and a MMS.. Don't quote me on that one though, go ahead and check it out on the net and get some info on it just to make sure..

But if you can, then yeah.. You can update to the OFW then switch back to CFW..

Goodluck :taz: