[PROBLEM] can't update library

[Tim Curtis]

Thanks for the testing. The "cache=none" option has been there forever but I can certainly update the help.

Most mount options are auto-negotiated when the mount is attempted but in some cases auto-negotiation cannot determine the correct values and the mount may fail. In this case certain options must be explicitly added or changed. Some of these are listed below.
SMB: vers=x.y, sec=ntlm or sec=ntlmssp, cache=strict
NFS: vers=x.y, type=nfs2, nfs3 or nfs4

I think rolling back an updated system to its pre-update state would be difficult to implement and most likely very unreliable in the field for example what if the rollback failed, then what.

The easiest and most trouble free is to boot a fresh image and restore from a backup.