You need a working hard drive.
You can use the controller to format the hard disk:
Press and hold the MOD button when turning on.
Select formatting from the menu.
When done, the HEIDENHAIN system must also be installed.
You can download it from HEIDENHAIN at this link:
https://product.heidenhain.de/JPBC/i...C/28064115.zip
When you're done, all you need to do is get the original backup from the machine tool builder ...
You can use TNCremo to reload:
https://product.heidenhain.de/JPBC/i...Cremo33428.zip
Always back up your machines! TNCremo can help you with this as well.