So all that guff on the wiz website is because of changes in the CPU revision on the P2 machines in some batches...
It goes like this...
1.05.xx was released for the S1, H1, P1, P2, when release these units had a REV B CPU in them. Over time they came out with a Revision C CPU in newer batches, and 1.07.xx came out to go on these units with the newer revision CPUs in them, if I recall it was a codec change or something like that.
Anyway the reason for the warning on the wiz website is because if you installed 1.05.xx firmware onto any wiz that had a REV C CPU in it, you would kill it, and need to do a firmware recovery procedure that only seemed to work on a Windows XP machine. See 1.05.xx firmware works only on those units with a REV B CPU in them.
The 1.07.xx works in any machine whether REV B or REV C so I'm not quite sure why Beyonwiz at that point didn't just remove 1.05.xx altogether and provide a 1.07.xx for each model across the board so that it was not ever an issue and people then didn't need to be caught up in checking serial numbers.
Suffice to say, whilst 1.07.xx is available for the P2, Lite, L1 on their web site, it is not for the P1, but I do have it so if you want it I can email to you...
Mark