For high-end CPUs like the CPU 1518-4 PN/DP , a 24MB memory card is not sufficient for a firmware update.
By following this structured approach, you can confidently manage the firmware of your S7-1500 controllers, keeping your automation systems modern, secure, and efficient. s7-1500 firmware download
A standard firmware update does not affect the user program or retentive data on the CPU. These remain intact. However, if you downgrade the firmware to an older version, it may affect the user program if newer features were being used. For high-end CPUs like the CPU 1518-4 PN/DP