Eurosec cp8l?

My alarm says can't set use 4667 and now says lockout,

I've tried returning it to factory settings as per engineers manual but no joy,I've tried and tried again but it simply won't default.There's no mention of any specific equipment needed in the manual and all appears straight forward.

The customer is getting restless now and this is my second visit attempt to default,

Thought I'd ask you guys on here.I know that defaulting is not given out on here, maybe I've missed something?.

Cheers and thanks