skin change is menu > setup > usage & gui > skin setup > and you can use a new skin by moving to your choice and pressing green button to save. Not convinced that will change your bootloading speed though. If you want to save anything to your usb you should wipe it clean and then plug it back into your box so that you dont have any zgemma folder. You can then plug it in the back of the box and set up the drive by pressing blue button > mounts > device manager > and then use right arrow on remote to change to usb hdd or whatever you prefer. You can then save you epg (changing you epg ettings from internal) and you can ftp the picons to your hdd as well.