Backup your µSD to a Backup folder on your PC BEFORE upgrading to a new Kernel

Format your µSD with the Panasonic SD Formatter 3.1
Use these options :
FORMAT TYPE - FULL (OverWrite)
FORMAT SIZE ADJUSTMENT - ON

PRIMARY Kernel :
Extract these files from M3Real_M3iZero YSMenu folder and copy to root of your µSD :

Games folder
System folder
TTMenu folder
SRESET.DAT
YSMenu.nds


DUAL BOOTING :
Download the latest Sakura/TouchPod Kernel and extract to root of your µSD.
Extract these files from M3Real_M3iZero YSMenu folder and copy to root of your µSD :

Games folder
TTMenu folder
SRESET.DAT
YSMenu.nds

Boot Sakura/TouchPod, then load YSMenu.nds.