k, so download filebox. or use ssh. to get into the n900 internal files.

and you should check under "/boot" for the power kernel. should be named "zImage-2.6.28.10-power47" if you have power47.

then check under "/etc/multiboot.d" for the power47.item number.

those instructions should set you in the right direction. you should take some time to play with the ins and outs of the n900, it should be fun.