Recommended pre-upgrade checklist
| Symptom | Likely Cause | Resolution in Update 4 | | :--- | :--- | :--- | | | Corrupt temp cache. | Delete C:\ProgramData\Siemens\Step7\Cache and C:\Users\[User]\AppData\Local\Temp\Siemens . Recompile. | | WinCC Runtime crashes on panel reboot | Incompatible HMI image version. | Update panel OS to firmware V13.0.2.4 using ProSave. | | PG/PC interface cannot find PLC on PROFINET | Windows firewall blocking DCP (Discovery and Configuration Protocol). | Add an exception for DCPFinder.exe and S7EpiSrvs.exe in Windows Firewall. | | License transfer fails | Automation License Manager (ALM) version mismatch. | Update ALM to version 5.2+ independently of TIA Portal. | Tia Portal V13 Sp1 Update 4
TIA Portal V13 SP1 Update 4 is widely regarded as a significant "turning point" for the stability and usability of the Siemens V13 engineering platform. Why Update 4 is a "Good Story" Recommended pre-upgrade checklist | Symptom | Likely Cause