I'm using the same flash as in my other system and I'm using the test disk from Thomas Rapp at powerup.amigaworld.de.
This test runs fine on my other system but not on the new system. The new system was actually a 68040 which has been changed to a 68060. The flash update goes fine.
There is 2 things I can think of now:
1) - The PPC part is dead;
2) - The 68060 I used is being identified by WhichAmiga as a rev1 which may be too old.
Regards,
Remco