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So guys from Maemo Community have overclocked their Nokia N900 to 900MHz. Here’s a guide on how to overclock your Nokia N900 to 900MHz.
Warning: Please do it at your own risk. We do not take the responsibility for your curiousness. Do it only if you are absolutely sure of.
Okay so now, even after the lame warning you guys are reading? Cool. Go ahead with the tutorial.
Step 1: Download the kernel.
Step 2: Now put your kernel file into the Maemo Flasher folder. Download the Maemo Flasher from here. The Maemo Flasher can be found at C:\Program Files\maemo\flasher-3.5
Step 3: Now lets set up your N900 to flashing mode:
Switch off the Maemo device
Press and hold down the ‘u’ key
Connect a USB cable between the Maemo device and host PC while holding down the ‘u’ key
When the USB cable is connected, it powers the Maemo device and sets it to flashing mode
When the USB icon appears in the upper right-hand corner, the Maemo device is in flashing mode
Release the ‘u’ key
If performed correctly, the USB image is visible in the upper right-hand corner of the screen.
The Maemo device waits indefinitely for Flasher-3.5 input when it is in flashing mode. If flashing is tried without first setting the Maemo device to flashing mode, image flashing may fail because the Maemo device may not be able to change to the flashing mode automatically.
Step 4: Now run the command on windows:
flasher-3.5.exe -k zImage-900mhz -f -R

Step 5: Make 6 packets of Magi. It should take roughly around 10-12 minutes to flash.