RB750 IPSec

I have a problem with a RB750 router with IPSec connection
I want to connect with pre-shared key but I can’t connect without certificate
I have same router but that one let me connect without certificate

The router that is working has:

SN: 2F2C013B7FE3
Current Firmware: 2.36
mipsbe 5.4

And the router that isn’t working has:

SN: 2F2C029415BB
Current Firmware: 2.38
mipsbe 5.4

In Log I get:

“ipsec,warning,critical Unsafe configuration, suggestion to use certificates”
Is there a way to prevent from using certificates, upgrading firmware, changing settings, etc

I have a private key and a public (.key), and a pre-shared key.


Can you help me please,
Adrian