After some investigation I found the change lilos has made (use for example
ghex or hexdump):
In the EFIUpdaterApp.efi the only change was:
00007360 00 00 20 00 44 76 00 10 25 c8 1c d5 00 00 20 00
to
00007360 00 00 20 00 44 76 00 10 e5 82 c1 15 00 00 20 00
The other change was that LOCKED_MB11_0061_03B.fd was replaced by the renamed
libreboot binary (already mentioned previously by lilos)
If you are keen to try to remove the limitation of flashing the same version,
resources I have found that may help are:
http://forum.macbidouille.com (French)
specifically:
http://forum.macbidouille.com/index.php?showtopic=367110&st=0&gopid=3983866&#entry3983866
http://forum.netkas.org (English)
The original update is available here:
https://support.apple.com/downloads/DL207/en_US/MacBookFirmwareUpdate1.1.dmg
Good luck!
