FTP helper not working

Hi, we are having issues when trying to connect an external FTP server from a system that’s behind a teltonika TRB255
After looking for while I found out that the netfilter helpers are disabled on the teltonika router.

cat /proc/sys/net/netfilter/nf_conntrack_helper


On the GUI, we have the helpers enabled so I don’t know where else to look for. Are there any specific howtos on this that I might have overlooked?

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