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:if ([:len [/interface find name="lte1"]] = 0) do={[/log error "LTE not found"] & [/system reboot]} else={[/log info "LTE-Found"]};
my RouterOS version is 6.43.4
:if ([:len [/interface find name="lte1"]] = 0) do={[/log error "LTE not found"] & [/system reboot]} else={[/log info "LTE-Found"]};