First, we don’t know how this device was configured. You should be contacting the company that configured it, not trying to fix it by yourself.
You may have to restore the firmware or restore factory defaults before you can reload the config file/program. See Chapter 9 of the IxAdmin Help Manual.
Here from the IxAdmin Help;
Ixxat IxAdmin might solve this as by restoring the factory defaults on the device. For this apply menu item Device | Restore Factory Defaults or tool bar button .
By restoring the factory defaults, all subsequently installed applications and files will be deleted from the device. Installed runtime licenses are not affected by this operation.
In case of damaged or manually deleted firmware files it’s possible, that this procedure failes or does not reach the desired success. This situation can be solved by reflashing the firmware. Depending on the extend of the damage a second firmware flash operation might be required. But this would be instructed in the displayed log of the flash operation which failed first.