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

DUAL BOOTING :
Download the latest EOS Kernel and extract to root of your µSD.
Extract the files from the DSTWO YSMenu folder and copy to root of your µSD :

_dstwoplug folder
Games folder
TTMenu folder
_DS_MENU.DAT
TTMenu.dat

Boot EOS then load YSMenu plug-in.

Note: You can only use up to a 2GB SDHC microSD.