The firmware of the custo com RF sticks with the serial numbers ER 2010 100 up till ER 2010 150 cannot be updated to a newer firmware version.
For the update of the custo com RF sticks you need to have the custo med Firmware Update Tool. This tool can be downloaded in the secured part of the service site. (https://www.customed.de/service/csitekernel4/inc/imagedownloaddb/calldownloaddb.inc.php?f=6.1846)