You installed manually, right? Well, in that case, chances are that the file permissions are wrong. It is important that the files containing the replacement ROM components have their "p" bit set, which stands for "pure".
You can now do the following two things:
Copy all the files from the modules disk fitting to your Amiga model again, making sure that the "P" bit is set this time, for example by using:
copy ... TO ... CLONE
instead of just "COPY", or, as a workaround,
Edit the Startup-sequence of your installation and replace
C:LoadModule ROMUPDATE
with
C:LoadModule AUTO
which will ignore the "P" bit. As a side effect, it may probably pull some modules into RAM that you wouldn’t expect.
