With firmware version 173 there has been a change in the menu of the devices. The previous item Settings --> System --> Repeater operation has been replaced by the item Settings --> System --> Encryption.
The change was implemented with the release of the repeater 2.0 and its encryption possibility. For the Repeater 2.0 and its successor Repeater HX please activate the item "Encryption". For other repeater models deactivate the "Encryption".
The further registration of a repeater is done according to the respective manual.