Guide from PhoneReport: Overclock N900

Notice! This is taken from another site! I have not tried it yet, as am waiting for a few months to see how the over clocked N900's fair after some time!

maemo (great) community have managed to set up CPU clock speed over 600Mhz, let's see how to do it in a few simplified steps :

1- Make sure your battery is fully charged !

2- Download one of those modded Kernels (choose the speed you want to use) :

125 - 900mhz kernel http://www.box.net/shared/7apa2pb3ay (Tested to give best results in terms of speed for a normal usage situation).

125 - 825mhz kernel. http://www.box.net/shared/5lr0hdbk4l

125 - 800mhz kernel. http://www.box.net/shared/kixpe4lqq4

125 - 750mhz kernel. http://www.box.net/shared/h2dlmp6xne

125 - 700mhz kernel. http://www.box.net/shared/c5kjp4tcz5 (Probably the safest to try if your only looking for a slight speed increase)

125 - 600mhz kernel. http://www.box.net/shared/u4qhc306ii

Or download the full package over here ! [http://www.justupit.com/files/HQNACU6F/n900_overclock_v2.zip

3- Make sure you put the kernel file into the maemo flasher
http://tablets-dev.nokia.com/maemo-dev-env-downloads.php?f=maemo_flasher-3.5_2.5.2.2.exe  folder on your pc so the flasher can find the file, in windows it's usually at C:\Program Files\maemo\flasher-3.5

4- Set up your N900 to flashing mode :

+ Switch off the N900
+ Press and hold down the 'u' key
+ Connect a USB cable between the N900 and host PC while holding down the 'u' key
+ When the USB cable is connected, it powers the N900 and sets it to flashing mode
+ When the USB icon appears in the upper right-hand corner, the N900 is in flashing mode
+ Release the 'u' key
.
Ps : more about flashing procedure over here http://wiki.maemo.org/Flasher#Setting_Maemo_device_to_flashing_mode

5- Run maemo flasher as admin (Still on windows) then run the command :

flasher-3.5.exe -k zImage-900mhz -f -R

(Of course, note that you'll have to change the zimage-900mhz to whatever kernel your using ie zimage-800mhz or zimage-700mhz)

6- it should take approx 10 seconds max, you're done !

Woooowwwww...it works...my N900 become more faster...

If your phone gets damaged but it wasn't overclocking fault (Bluetooth, for example) you can send the phone to repair.

But if the phone CPU died while overclocking, they won't repair for free.