this is what i did, i use it all the time, unleashx is nice for the filemanager, formating, xbox to xbox ftp, etc..
--download mechassault with evox (usual places)
--delete default.xbe (evox) and evox.ini
--put PBLmetoo (default.xbe), bios (metooM8), and bootc.cfg into folder
--edit metoom8 bios to look for E:\UDATA\4d530017\62D648EBF155\unleashx.xbe
(remove load default.xbe from D:, or it will reload mechassault)
--put unleashx.xbe into folder with config.xml
--transfer to xbox (various method)
--run game
so the folder should have
E:\udata\4d530017\62D648EBF155\
=====================
boot.cfg (pbl metoo boot file)
Config.xml (unleashx config file)
DEFAULT.XBE (habibi signed pbl metoo default.xbe)
MASave.sav
Metoo-M8plus_16-06.bin (modified metoo M8 bios)
SaveMeta.xbx
unleashx.xbe (unleashx duh...)
xbsavegame.dat
so it loads PBLmetoo, which loads m8 bios, which loads unleashx, all from the gamesave (still suffers ROE, but you can run unsigned code from it)