I got a distress call yesterday from an officemate with an iPhone 3G (a
relatively new one even if the iPhone 3GS is already out)
The iPhone had a blank white screen running old firmaware 2.2.1 and after trying to reset it, Id decided to upgrade it to the latest iPhone firmware version to see if it fixes the problem.
As I plugged the iPhone to my notebook and fired up iTunes, I was able to upgrade it to the latest version but an error of iTunes kept popping up that says:
“We could not complete your iTunes store request,an unknown error occurred (-9808)”
After investigation and some logs "forensics" of Windows Vista, I found out it's caused by a certificate revocation error, probably due to my use of an older iTunes version.
Due to lack of time, I just used a workaround solution to "hack" Internet Options (from Internet Explorer Options tab), Advanced and Security to uncheck "“Check for server certificate revocation (requires restart)” then restarted Internet Explorer to effect the change.
When I tried again to access iTunes store, the error did go away.
My officemate was so happy she thought her iPhone's bad and saved her the hassle of visiting Globe business center for local iPhone technical support.