It's quite annoying “expired certificate” problem that happen when few attempt to install SIS/SISX program files in Nokia 5800 XpressMusic.The Google result suggests me to reset the date of phone to be earlier or later than current date,format the phone with *#7370# secret key followed by changing the phone regional settings to other countries (UK, HK, etc), set “Online Certificate Check” to off, etc.
There are forums and blogs mentioned that the version 10 firmware is well known for this “expired certificate” bug and thus should upgrade to the latest firmware version 11.0.008. However that doesn't solve the problem either..!!
How to Fix "Expired Certificate" on Nokia 5800 XpressMusic :
Step By Step..
Backup all messages, notes, calendar entries, and contacts.
I used Nokia PC Suite to backup all these four components instead of using Nokia 5800 inbuilt backup function, which doesn’t has an option to backup Notes (but I’m not sure the ALL settings will back up the Notes).
Remove the microSD memory card.
When the phone is powered on, don’t simply remove the memory card. Otherwise, the memory card content will likely corrupt.
To remove the microSD card when the Nokia 5800 is switched on, press the power key (the button next to the power charging port), scroll down to locate and select Remove Memory Card, opt “Yes” as the “Removing memory card will close all open applications. Remove anyway?” message is displayed.
Shortly after, the “Remove Memory Card and press OK” message appears, and then the microSD is ready to be unplugged or removed from the dedicated slot.
Notes, both SIM card and microSD card slot are next to each other on the same side (another defect, personally), don’t be careless and end up corrupting the SIM card (if you happen remove SIM card instead of microSD card).
Format the Nokia 5800
Access to touch keypad and enter
*#7370# secret code (not so secret, anyway) to restore phone settings to factory default (even the user data and files are deleted).Next, you’re prompted to enter the Nokia phone lock code. The default is 12345, if this code hasn’t been changed by yourself or any one.
Then, the phone restarts and you’ve to select the country region (just select your own country from the list, in this case), followed by request to enter current date and time.
When the phone is ready, power it off again to re-insert the memory card (for highly safety measure, unless there are nothing important kept in the memory card, e.g. picture, music, documents, etc).
As the phone is switched on again with memory card inserted, the “preparing memory card” message appears.
Source: Internet
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