ok I tried soft modding my xbox but soon after that it went to hell after i changed my dash and all I got error 21 and cant get to my dash or connect live. Then when i backed up my c drive it didnt do a full C drive for some reason well thats just fucked

all my saves are on my xbox BUT my xbox isnt per say detecting them. Like in Kingdom under fire for instance you have to beat so and so's campain to move to the other ones. So i went to load a saved game not knowing its not readable or something none of my saves were there but then when i went to new game i could use the campain's that had to be unlocked. Well moving on
Im going to get a Aladdin Live with Programmer chip(its like only 15$ but im paying for the express shippin so its like 50$

so i get it in a few days) and use one of those boot disks but i have no idea where to get one of those so if some one would point me in the right direction with that i would preferr an evox boot disk or some thing because i think the dash i put up on my xbox is an evox dash
and another question once i have evox or what ever installed from the disk will that over ride all my current dash boards and such that I installed to overcome the error?
*PLEASE FOR FUCKS SAKE ONLY POST USEFULL INFO*