Optus's boss has staked his leadership on the embattled telco avoiding another triple-zero outage disaster.

As the fallout continues from the provider's catastrophic outage - linked to four deaths - chief executive Stephen Rue offered a guarantee Optus would not let a similar thing happen in the future.

His assurance came despite a barrage of criticism of Optus for failing to implement recommendations from a review into a similar national outage that crippled the network.

About a third of the 18 review recommendations stemming from the 2023 outage, which resulted in fines totalling more than $12 million, are yet to be implemented.

Early investigations into Thursday's incident appeared to show established processes were not followed, with a botched firewall update blocking hundreds of t

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