You need these tools. So download them:
Nokia Ovi Suite or Connectivity Cable Driver
JAF tool and Pkey (Nokia Flash Tools.rar)
Dot Net framework (at least version 2 for WinXP user)
Install Nokia Ovi Suite & Backup Your Phone
Install Nokia Ovi Suite and back up your phone especially your contacts, message etc. In fact, just backup everything because prior to flashing your phone, we need to hard reset it and format your phone memory card to avoid any potential error later on. Hard reset will erase all your contacts, message, phone setting etc. So back them up using Nokia Ovi Suite.
Even if you don’t want to back up your phone, it is essential to install Nokia Ovi Suite for the driver purpose. Otherwise, JAF tool can’t see your mobile phone at later stage.
Download Your Phone Original Firmware
Now we need to download your phone’s original firmware using NAVIFIRM. Originally, we flash our phone using Ovi Suite or PC Suite right. This suite automatically detects our phone hardware and software then downloads and installs the relevant firmware for our phone automagically. However, for this one we need to manually select and download the right firmware for our phone.
Extract and run NAVIFIRM. Mine is as shown below.
Choose your phone model correctly. As we can see here, there are 3 variant of Nokia 5800XM. The RM-356, RM-427 and RM-428. Different model number use different kind of hardware. So, do not download firmware for RM-427 or RM-428 if your phone model is RM-356. You can check your phone model by typing *#0000#. Look for Type.
‘Release’s is firmware version. Ensure that the firmware you are going to flash into your phone (the one you are about to download using NAVIFIRM now) is newer (or at least has same version number) than the one that already in your phone. Downgrading firmware will definitely brick your phone. You may check with your phone firmware by typing *#0000# too. As for my case, my current phone firmware is 51.0.6. So, I have to download ‘releases’ version 51.0.6 or later (in this case, 51.0.6 is the latest one).
Next, choose your phone variant. My Nokia 5800XM is for Malaysian market and has ‘red lining’. Therefore I chose “APAC1 RED MALAYSIA (0570196)”. If you are not from Malaysia, for example Indonesia and your phone has blue lining, you may want to choose “APAC1 Indonesia BLUE (0559960)” variant.
Finally for the files section. Just tick them all. And press “Download from FiRe” button. Save the files into “Your phone model number” folder. As for my case, I save them into a folder name RM-356 on my Desktop
If you happen to use Windows Vista or Windows 7 (32 bit or 64bit), you have to change JAF PKey Emulator’s compatibility first. Right click on the JAF Pkey Emulator and choose properties. Click on Compatibility tab and set compatibility mode to and set privilege level as as shown in the screenshot below: