Since generating input on the serial cable corrupts the output, I decided not to upgrade the bootcode at this time. Of course, the reason I tried upgrading in the first place was due to a MKV playback issue, which is not fixed with the P61 I am using now, but I can always use mkWDclean, I guess.
flying, I was unbricking a HornetTek (I also have a PBO) and the hardware is the same. Check out the photos of the unit on the forums or here and if it's the same, you can decide to take a risk! (Nothing is without risk. I was bricked so there was nothing to lose.)
If you're in Chicagoland and need to borrow my really poor cable to do "erase -m" let me know!