Currently there isn’t an easy way to do a hard reset on the N900. Nokia should include this in a future firmware as there is an urgent need for this feature: for performance reasons, a “clean start” and when selling your devices.
A Care Specialist for Nokia has shown how to do a hard reset for the N900, this is the only way to do this until we get an easier method. Tried this myself and it should work! From a windows PC
1.Download the flashing software.
The first software you need is called “Maemo Flasher”, and this is the program that needs to be installed on your PC and can be found here:
Download the latest version of Maemo Flasher (which is currently 3.5 at time of posting this), and make sure you download the .exe file.
Install that file.
2.Download image files for the N900 itself
These files can be found here:
2A.This page will ask you to enter your IMEI, with very clear instructions on where to find it.
Follow the on screen prompts until you reach the download section.
There are two pieces of software you need to download from there.
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eMMC content – This is the package to erase all data held on your 32GB storage.(For PR1.3 choose the one marked Latest)
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OS – This is your operating system.
2B.There are two eMMC packages available, so download the Latest. For PR1.3 It’s called:
RX-51_2009SE_10.2010.13-2.VANILLA_PR_EMMC_MR0_ARM.bin
2C.The OS is a little more difficult to figure out which one you need.
The notes alongside the software lets you find the right package easier.
I found the best way to check is to do the following: (On the N900)
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Menu
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Settings
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About Product
This will show you this image(or similar)
Note the Version number on your N900′s screen.
Download the OS package that matches the Version on your device. As shown in the image above, using the red text as an example.
For people that purchased the N900 in the UK, the OS package will probably be the same as the red text (203). But make sure you check. Also be sure to download the Latest version of your package, which is marked by the word Latest.
This might also help, check the last 3 digits of the software:
For USA (Last 3 digits are 002) you will need the file called:
RX-51_2009SE_20.2010.36-2.002_PR_COMBINED_002_ARM.bin
For Middle East and North Africa (Last 3 digits are 003) you will need the file called:
RX-51_2009SE_20.2010.36-2.003_PR_COMBINED_003_ARM.bin
For India (Last 3 digits are 004) you will need the file called:
RX-51_2009SE_20.2010.36-2.004_PR_COMBINED_004_ARM.bin
For UK (Last 3 digits are 203) you will need the file called:
At time of writing, UK file was not uploaded, yet.
For Global (Last 3 letters are MR0) you will need the file called:
RX-51_2009SE_20.2010.36-2_PR_COMBINED_MR0_ARM.bin
Software downloads complete.
3.Place these two software packages in the following location on your PC.
c:\program files\maemo\flasher-3.5
You should now have two .bin files in the directory above.
Next steps.
4.Updating the N900 OS
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Your battery needs to be 100% full to prevent any crashes which could leave your phone dead.
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Turn your N900 off.
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Press and hold the U key on the keypad.
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Insert the USB cable, into a USB port, NOT a USB adapter. (a USB symbol should appear on the top right of your N900 screen, and also the Nokia logo in the centre).
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You can now let go of the U key.
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On your PC: Navigate to the Start Menu and select Maemo>Maemo Flasher 3.5>Maemo Flasher 3.5
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In the command window you should now see: C:\Program Files\maemo\flasher-3.5>
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Type: flasher-3.5 -F RX-51_2009SE_20.2010.36-2.002_PR_COMBINED_002_ARM.bin -f
(the file “RX-51_2009SE_20.2010.36-2.002_PR_COMBINED_002_ARM” name above may be different to yours, you will need to replace the filename with the filename of the software you downloaded). One easy way to do this is to navigate to C:\Program Files\maemo\flasher-3.5 and get the name of the file their. Depending on your region the file name can be:
RX-51_2009SE_20.2010.36-2.002_PR_COMBINED_002_ARM.bin (USA)
RX-51_2009SE_20.2010.36-2.003_PR_COMBINED_003_ARM.bin (Middle East and North Africa)
RX-51_2009SE_20.2010.36-2.004_PR_COMBINED_004_ARM.bin (India)
RX-51_2009SE_20.2010.36-2.004_PR_COMBINED_203_ARM.bin (UK)
RX-51_2009SE_20.2010.36-2_PR_COMBINED_MR0_ARM.bin (Global)
9.This image below shows the completed update of the OS, in the command prompt on your PC. This would have now removed any Apps you may have installed on the device, and reset the homescreens to how they were when you turned it on for the first time.
Your personal data, such as Contacts, Images, SMS will still be on the device.
So if you want to remove these as well, follow the next steps.
10.Do not disconnect or reboot the device the device. Just leave as is for now.
5.Resetting the Mass Memory
1.Type in the command window :
flasher-3.5 -F RX-51_2009SE_10.2010.13-2.VANILLA_PR_EMMC_MR0_ARM.bin -f -R
This image below shows the completed reset of the eMMC (32GB HDD), in the command prompt on your PC.
This would have now removed any data you had stored there. Including Music, Photos, Contacts, SMS..
The complete reset of your N900 (Or Update) is now complete.
Note: This process won’t work with 64-bit versions of Windows 7 or Vista. You’ll either have to look for an XP system or use Windows XP Mode with Virtual PC on 64-bit versions of Windows 7 Pro or Ultimate. 
فك رمز حماية وفورمات نوكيا إن900 = Reset Nokia N900 Security Code
فك رمز حماية وفورمات نوكيا إن900 = Reset Nokia N900 Security Code
رد: فك رمز حماية وفورمات نوكيا إن900 = Reset Nokia N900 Security Code
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