1. Enable UTM SSH access in Management -> System Settings -> Shell Access. Define login user and root passwords and put "Internal (Network)" object in Allowed Networks box. 2. Connect to UTM LAN IP address using PUTTY tool. First login as loginuser, and then type su command and provide root password. 3. Navigate to /var/up2date/sys folder and check it's content with dir command. Remove everything in it with rm * command. 4. Run auisys.plx command to force up2date.
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