I finally figured out what the problem was with the ESET SysRescue ISO+Persistence menu that I did have working but then didn't work when I retested it. I had missed out the lines in the .mnu file which set the UUID of the 'live-media' - this meant that the live-media value was invalid and so it resorted to the CD updates. Also, you need to copy the ext3 partition from a working Eset flash disk (I cannot figure out what it is in a working ext3 image that is different from a non-working image made using RMPrepUSB 'Make ext2 FS' and copying over contents)!
I have also edited the menu now in the previous post (see lines in red).
So you can now boot from ISO with persistence if you wish, instead of using a .imgPTN file.
I have also edited the menu now in the previous post (see lines in red).
So you can now boot from ISO with persistence if you wish, instead of using a .imgPTN file.