Sansa Fuze Firmware Update 01.02.31 & 02.03.33

Hi,

I just got a Sansa Fuze with the installed Firmware v02.02.26P. Do I have to worry about that “P” when I make a firmware update? Can I save the installed firmware with that P from the Sansa Fuze in case anything goes wrong with the update?

By the way, all the different versions of firmwares I have downloaded look alike, have the same name and size. Only the carrying zip-files have different names! Is that correct?

Thanks to anyone who helps,

notrabacho