First you need to upgrade RAM to at least 32GB
Next you need to move all VPN's to IKEv2
In version 6.7 cisco remove old ciphers and you can't upgrade until they are all removed.
You don't want to see group 2 or group 5 anywhere in your config.
Use group 14,19,20,21 instead.
This is true for the PFS group as well, select group 21.
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