You have RouterOS installed on a standard PC (x86). The hard drive dies. You replace it with a new SSD. When you reinstall RouterOS, the Software ID changes because the new drive has a different serial number. Your Level 4 license is now "Unregistered."
Before updating your license registration, you must extract the newly generated Software ID from your router interface. Method 1: Using WinBox Open the MikroTik WinBox Utility and log into your device. Navigate to the left-hand menu and click on . Select License . mikrotik change software id link
This is powerful for scripting recovery in dynamic cloud environments where VMs are cloned or migrated. You have RouterOS installed on a standard PC (x86)
Comprehensive Guide to Managing and Linking a MikroTik Software ID When you reinstall RouterOS, the Software ID changes
If you are using a trial license and the 24-hour period expires, re-installing on the same drive will not generate a new SoftID. You must use new hardware or a new virtual disk.