CRU02 is the control and readout unit of Hukseflux FTN02, MTN02 and TNS02 systems.
The CRU02 is designed such that new software can be installed at no cost. 
For available software / firmware updates, please check:
http://www.hukseflux.com/page/downloads

Software can be downloaded from a PC to the CRU02. This can be done using the CRU02 Service software. 
Go to Tools and press Flash firmware. The new firmware can be selected and will be uploaded to the CRU02.
