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z3 compact tablet unable to turn screen lock off

One time poster
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Message 1 of 1

z3 compact tablet unable to turn screen lock off

I've struck an odd problem. I would like to turn the screen lock off but can't!  Settings/Security/screen lock/ select screen lock brings me to the usual four choices but not None. Can anyone please advise.


I have tried Clear Credentials but this does not help.