It is highly recommended that all users of TIA Portal V13 SP1 update to Update 4 to benefit from the latest enhancements and fixes. This update is particularly crucial for projects that are already deployed or are in critical phases, where stability and performance are paramount.
: F-blocks marked as "Unsupported Blocks" are automatically supported after a project upgrade to V13 SP1 Update 4. Programming Tia Portal V13 Sp1 Update 4