RV042 compatibility between older firmware and new

Hello all
We have several RV042 routers with older firmware version 1.3.12.19-tm.
We have purchased new RV042 routers as hot spare replacement that's coming with firmware version 4.1 installed.
We have a VPN tunnels between multiple sites using the older firmware version.
My question is: Will a RV042 with firmware version 4.1 connect to a RV042 with firmware version 1.3.12.19-tm and vice versa?

Jack,
i have seen some case come through customer having problems with connections between RV042 V2 to V3. So i wanted to test this in our lab. I tried to make them disconnect and couldn't please note this was an ideal connections no ISP involved. I did put them on the T1 connection but both public ip address are really as if locally connect as they will hit the gateway and route back through several switch i still didn't have any trouble. I have seen some V3 have trouble with older modem and cause duplex mismatch, so if the connection between modem and router is solid. Your tunnels should be solid. If you have trouble give Cisco Small Business a call @ 1-866-606-1866 and open a support case on the v3 router.
Jasbryan

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