You are in the wrong section. This is the TSOP flashing section.....
Do you mean Apple-X VII? It is important, because the newer versions of the Apple chips can be reflashed, while the older ones can't. Have a look at the pictures linked at the bottom of this table
to confirm which chip you have, then look at the table to see if it can be reflashed.
However, that isn't related to your question directly. You are confusing the BIOS and the dashboard. The chip (and the BIOS on it) have nothing to do with the dashboard - you can run any dashboard you like, just install it at C:\evoxdash.xbe.
However, before you do that, do some other things first. Confirm the chip version, make sure you can boot a rescue disc e.g. HeXEn (Google Heimdall's Xbox Engineering Disc) or Slayers, burned to DVD-R. Also run BIOSChecker to confirm which BIOS you are running.