I HAVE ACQUIRED A 2ND HAND ENDER 5 PRINTER BUT DID NOT RECEIVE THE TF CARD MENTIONED IN INSTRUCTIONS, IS IT IMPORTANT?
Hello Cydecon and welcome,
If the printer is running and reachable through WiFi, then not really unless you need to flash firmware.
There is not any reason to change the firmware unless there are problems.
It is a good idea to get the card just incase.
Cheers.
Which Ender 5, they are all quite different machines.