My PSP was neglected for a while so I decided to dust it off and have a quick go on the Metal Slug ISO I got. Sadly I realised it required the latest 3.10 oe and my current one is a 3.03 oe-c. If I follow the instructions correctly when upgrading it, does that mean all the stuff that was already on my memory stick stay intact or do I have to format the stick before upgrading it?