I'm running this ios version on vpn 3005:
What is the upgrade that I need to perform:
In your case, you can upgrade either upgrade the VPN3005 to 4.1 or 4.7 and both should be OK. Make sure that you have sufficient RAM to upgrade to 4.1 or 4.7 code and read the release notes in detail to avoid surprises
I hope it helps.
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