1) I was asking how to downgrade to A05 thinking someone would offer some comprehensive assistance, such as - "Download A05 BIOS from this link and install it by doing this..." Sorry it wasn't perceived that way. I wasn't aware it would be such an issue... :/
2) From everything I've read - which is quite a ****ing lot - converting a 10v to OSX requires that the BIOS be below A06. There is one guide here which walks users through installing OSX with A06 already on the 10v but they must already own a Mac, which I don't.
3) Again, according to everything I've read, A05 is cleaner and fixes several of the frequent issues which occur when using A04.
Anyhow, it's done now. This can be closed.