No, when i said upgrade, it was a firmware upgrade of the keyboard under mac os x. The update was done via bluetooth, in order to add some features and removing some problems.
After that upgrade, i was able to boot into open firmware on my mac mini with the wireless keyboard. Later, when i installed mos, it can be accessed the boot menu pressing alt on the wireless keyboard, but once mos booted, the kwyboard dont work there, so i have to rely on a usb keyboard since then.