The is a specific software add-on for TIA Portal V15.1 that enables the configuration of S7-1200 CPUs with Firmware V4.3 . Without this package, your hardware catalog will not show the V4.3 option, preventing you from downloading projects to newer or updated hardware. Key Features introduced in V4.3:
Without HSP0276, even if you have TIA Portal V15.1 or V16, you will not see the V4.3 CPU variants in your hardware catalog, nor will you be able to download your project to a physical CPU that has been updated to V4.3. Hsp0276 S71200 Cpu V4 3 Download
No. Firmware V4.3 is not compatible with those versions. You must upgrade your TIA Portal to at least V15.1. The is a specific software add-on for TIA Portal V15
To use the SIMATIC S7-1200 CPU Firmware V4.3 TIA Portal V15.1 , you must download and install Hardware Support Package HSP0276 To use the SIMATIC S7-1200 CPU Firmware V4
You forgot to restart TIA Portal. Close all TIA processes using Task Manager if necessary, then reopen.