@dpk: Which packages did you try to install? And was that with the very latest MRPI snapshot?
(Note that the "switch back to RO" failure is a warning, not a failure, it cannot be the cause of an install failure, since it happens after a package install, during the cleanup phase).
That said, what @knc1 holds true: KPVBooklet probably has severely limited chances of actually working on the PW4 or the KOA2, and possibly on anything running FW 5.10.x or even 5.9.x
.
Nonetheless, someone reported such a weird RO warning with other, tamer packages earlier, so I'd be glad to see some logs... (MRPI at the least, but the cherry on top would be full system logs caught during the MRPI session).
(See the first page of this very thread for more details, that was one of the first things to come up
).