ROM 3.1 gives me floppys checksum errors?

[zonaps2]

I've got an A500 with 1mb RAM, change the 1.3 ROM for this 3.1 40.063 ROM, now I'm getting "checksum error on block xxxx" on most diskettes, is this the famous incompatibility issue??? I've tested workbench 3.1, it runs fine, then Amiga Explorer gives me checksum error.

I thought Amiga Explorer was 3.1 compatible

[zonaps2]

Not really. KS 3.1 is somewhat better at detecting and reporting errors, however.

So, I need to fix most of my floppies?
I'll go back to 1.3 then