The WSOD occurs wen the firmware boot analysis fails to verify the intergrity of memory card. This could happen due to improper plug out the memory card from computer or a laptop without terminating the active connection "Safely Remove Hardware" or force fone shutdown with taking out battery few times, these can lead to corrupted memory card.

Its same like a desktop / laptop computer, the more u improper shutdown, the problem will rise on the next start.

Its advisable to make a full backup of memory card somewhere in computer, incase of crash, the user can just format the memory card and opy back the old data.

Having an issue with your Nokia 5800XM / Nokia N97 when it simply couldn't boot up with stuck at Nokia logo and the only way out was to do hard reset. No more hard reset again say no more to losing all my data and tried playing with battery, SIM, SD/SDHC, headphones and charger random insertion and removal.

All you need is:
- Nokia Nokia 5800XM / Nokia N97
- Charger

Follow these steps:
1. Turn OFF your phone.
2. Insert charger.
3. Remove charger right after screen lights up.
4. Wait a couple of seconds till screen turns off and just after that press power button.
5. After standard vibration notification just put your charger in.
6. You can insert your PIN again.
7. Done !.

Now as the standard procedure to overcome this problem read below my write ups. Fresh bought or even having data loss? Refer below tips !

Set you Windows Explorer -> File Options (Enable view all files & system files)

1. Format ure SD Card (manual DOS trick),
- Goto Command Prompt and type C:\>Format <SDdriveletter> eg. Format E:

2. Or you can use Windows Explorer formatting, right click on the memory card drive letter and select format.

(Dont't ever use quick format!)

3. Wait until it finished.
4. Install ure desired apps and games and themes.
5. Defrag (not recommended) and ScanDisk ure SD Card every 1 week.

Memory card or flash memory card is solid-state electronic flash memory data storage device capable of storing digital contents. Most SD cards ship preformatted with the FAT or FAT 32 file system on top of an MBR partition scheme. The ubiquity of this file system allows the card to be accessed on virtually any host device with an SD reader. Also, standard FAT maintenance utilities (e.g. SCANDISK) can be used to repair or retrieve corrupted data. SD cards with 4 GB and smaller capacities can be used with many systems by being formatted with FAT16 (4 GB only possible by using 64 kByte clusters, and not widely supported) or FAT32 file system (common for file systems 4 GB and larger). On an SD card, this is unnecessary, as the time required to access any block is the same. Defragmenting an SD card will wear the card out slightly, as the number of writes are limited before failure occurs (usually 100 000 times).

Enjoy!

Message
- Certificate error. Contact the application supplier.
Explanation
- You may have tried installing unsigned application. Note that signing is mandatory S60 3rd Edition. You can use self-signed certificate or developer certificate from Symbian Signed to sign your application.

Message
- Unable to install. Constrained by the certificate.
Explanation
- This message pops up when you attempt to install developer certificate in the unsupported device. The developer certificate from Symbian Signed can only be used in a limited number of devices. Remember that you have to send your IMEIs to Symbian Signed when requesting certificate. You cannot use the certificate in other devices that is not in your IMEIs list.

Message
- Required application access not granted.
Explanation
- Check that your certificate can be used to sign all capabilities needed by your application. For example, if you use self-signed certificate, you can only sign basic set capabilities, i.e. NetworkServices, ReadUserData, WriteUserData, LocalServices and UserEnvironment. If your application requires one of the extended capabilities, for example SwEvent, you cannot sign it with self-signed certificate. In this case, apply for developer certificates from Symbian Signed.

Message
- Unable to install a protected application from an untrusted supplier.
Explanation
- If you use self-signed certificate, make sure that your application uses unprotected UID, i.e. 0xA0000000 - 0xAFFFFFFF. If you use protected UID (0?20000000 - 0?2FFFFFFF) or legacy UID (0?10000000 - 0?1FFFFFFF), you will get this message.

Message
- Unable to install.
Explanation
- This message may come up when your installation file (.sis/.sisx) copies files to other application?s private folder, i.e. \private\uid. Note that Symbian 9 introduces data caging concept, it means you dont have access to other applications private folder.

Message
- Expired Certificate
Explanation
- Do this? Set the phone date back by 1 year or 5-6 months.

Message
- Update error
Explanation
- Uninstall any previous version of the application, then switch on/off the phone and install again.

To get Certificates you must Register first :
- http://cer.opda.cn/en/?module=index&action...action=register

After register you must apply Certificates :
- http://cer.opda.cn/en/?module=certificate&...te&action=apply

Wait for approximately 48 hour to get your Certificates (Check your account from time to time).
Get FreeSigner (Mobile Based) or Sign SIS (PC Version)

Download: http://www.2shared.com/file/10095405/d0fd4...gn_SIS_GUI.html
Video Guide Signing Symbian S60 SIS & SISX Application

Under circumstances PC Suite mode to connect your phone with computer, there is no need to "Safely remove hardware". You can simply plug-out your cable from the Phone and PC. In case if you are selecting Data Storage mode, your phone will act as a storage device (USB Drive to store data etc.), in that case only you have to safely remove hardware from your computer.