If you installed EvolutionX on you Xbox harddrive and you made an error in the evox.ini on your harddrive it's possible the Xbox won't be able to boot again.(or if you deleted the bootfile(s))
It's possible thought , to boot your Xbox with the EvolutionX disc. Once EvolutionX is booted you can access the Xbox harddrive by FTP and you can reupload a new working evox.ini or bootfile.

Here is what you have to do :

1/ Extract the EvoX iso with an Xbox ISO extractor (for example : xISO) on your PC harddrive.(tutorial)

2/ Correctly fill in network settings in evox.ini (the one that was packed in the original EvoX release) for your personal network.

3/ Rebuild the ISO (with file extracted in step1 and menu.ini from step2) with an Xbox ISO maker (tutorial).

4/ Burn the ISO on CD-RW/DVD-R/DVD-RW.

5/ Boot the Xbox with the disc you just burned above in the drive. If for some reason the xbox starts rebooting, turn it off with the disc still inside then turn the xbox back on.

6/ EvoX is now booted , so you can access the Xbox harddrive with FTP and re-upload a working evox.ini or bootfile (evoxdash.xbe for default new hacked bioses).