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Any chance you can put it on a guest network?

Or...hardwire it whilst they update it remotely, then disconnect it.

I'm not familiar with the new charger...how do you initially setup the wifi if you can't talk to it without an internet connection?

Never mind...found the setup procedure here:

FAQ | Car Charging At Home And bp pulse Home Chargers | bp pulse

We answer your frequently asked questions about charging your electric vehicle at home.

www.bppulse.co.uk

 

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I had to give the installer my home network WiFi password.
It was at that point I realised it's a seriously flawed design, I mean. would you give a stranger the password to your on-line bank account ?
So as soon as the installer had gone I set the charge times using the "App" on my phone then changed my home network access password.
So now it has stopped working. BP obviously don't like me blocking access to all my personal data.

He probably thought he was doing you a favour rather than having you set it up yourself.

Just setup a guest network and connect it using the instructions in the link I posted. Anything on the guest network will have access to the internet, but not your other devices.