Am I right in thinking that I can download the zip for 5.5 onto my SD card and flash that from my recovery menu if I am running 5.3? Or is there some reason I would need to wipe 5.3 before flashing? The benefits of overwriting (from what I understand) would be that many of my existing settings, apps etc would still be intact. Has anyone simply overflashed 5.5 onto 5.3 perhaps? Just wondering if anything untoward happened before I risk doing something really bad to my toy!