Hope this helps...
How To: Flash Your Nokia N900
Let me know after you've flashed were you able to make Video calls ?
i dont know if my comments are void or valid, i did fry too many routers with wrong firmware and i had to jtag them up and they worked fine, this includes the wrt54g v5, yes the pissing off dreaded cdfb type. and i then screwed up the flash totally and there was a point of no turning back. it has 2 MB ram and 8 MB flash, so i remodded it up with 32 MB ram and 1 GB flash, yes its a little slow, but its fine by me, along with POA and batterypacks.
now i been playing with maemo for quite a while, and i feel okay and comfortable with it, i am up with LFS for n900, so there i did learn see a post which shows almost similar method to jtag up a totally bricked phone. once again, its for those who are daredevils. if you wish to void your warranty fully, and tame this beast and obey your commands? i will suggest you to try the jtag method.
but alas this is arm, so jtag which is for mips will not fit in IIRC, so you may need to grab your hands on avr jtag ice varieties. there is a serial port also. si guess if you pin properly? or a sitting pin duck? then you can un/de-brick it w/o any issue, and go too and fro firmwares and if you are of the techie dev type? try build your own mer or scratchbox2 or maemo5 sdk or meego sdk. choice is yours. good luck.
yes if you screw up the firmware upgrade and it goes choppy you can still avr jtag ice it up and recover.

i am still waiting for the secret link from "follower of krazyy" yet to touch this monster with my own hand and call it mine.
still guessing.




:glass-jumping:
