When cisco find an issue they sometimes release a hotfix as a small quick fix.
The real fix will be put into the next maintenance release.
6.6 last FMC that supports cisco user agent ID. If you want to go above you need to uninstall useragent and install Cisco ISE-PIC agent
6.7.0 removes support for old ciphers. If you are using FTD you need to make sure all VPNs have been migrated to IKEv2 and updated ciphers.
ASA55xx-X devices only support up to certain sensor patches at time of writing 6.6.5.2
When you upgrade to 6.7.0 for example you should also upgrade to the latest release of 6.7.x at the time of writing it was 6.7.3 this ensures you get all fixes in your branch.
Because branches are worked on by different dev teams just because its fixed in 6.4.0.14 does not mean the same issue is fixed in 6.7.0 so you need to make sure to go to 6.7.3 or what ever is that latest patch in that branch
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