MMI2 Update - "metainfo2 txt not found"

[Oodoom]

This could be a rather short lived attempt to update my system!

I downloaded the 3 5570 discs from https://a6retrofit.com/mmi-software-...1-5570-5-5-70/ and have burnt them at 10x speed (as slow as my laptop would do it)

Am attempting to start the update, I select CD ROM in the red SWUpdate menu and after a few seconds it says "metainfo2 text not found" and wont let me start the update.

Im upgrading from version 4220 to 5770 - as I understand it from various forums I can upgrade in one go without needing interim versions - is this right?

So, what am I doing wrong - have I burnt the discs wrong? Am I attempting to large an upgrade step between versions?

Im going to burn the discs again but if anyone has any advice please share!

Thanks in advance

Adam