Repeat techniques two to 4 for your whole old BRK alarms. We advocate changing all alarms within the technique together to maintain ideal process Procedure; failing to take action could compromise interlink functionality. 02 will require to be up-to-date by 30th September 2021 so as to obtain aid for anyone https://www.firesense.co.uk/type/addressable-fire-system/addressable-fire-alarm-control-panels/