From the site it says:
The PLAYSTATION®3 (PS3™) system software version 2.41 is now available for update from July 8, 2008. With this update, we have fixed the problem that has prevented
a limited number of PS3™ from activating properly after updating to version 2.40, when a certain system administrative data are contained in the HDD.
For those users who have updated to version 2.40 and have experienced the problem that XMB™(XrossMediaBar) is not appearing, or no images are displaying on the screen, please contact Customer Service.
We have confirmed that for those users who have successfully updated to the version 2.40 and are able to activate the PS3™ system, this problem will not occur on your PS3™. We apologize for any inconvenience this may have caused you and appreciate for your understandings and continued support.
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Looks like my PS3 is in the clear as there's no problems whatsoever after playing it a few times na.
I'm lazy to upgrade another FW again not until something happen (knock knock on the wood).