Red flash connection error

So I decided to have a go at creating a local cloud using this.
I didn’t get it quite working so decided to go back to it at a later date and work on something else.
Problem is now when trying to connect the spark back to the spark servers on the internet I get 3 single red flashes (flashing cyan then 3 red flashes and then a restart, sometimes I get a few green flashes too).

Things I have tried:
All the simple stuff (factory reset, router reset, etc)
Reset the config back to the spark api
Reflashing new firmware
Creating a new set of keys and putting that on the core

Is there an easy fix for this or am I missing something?

You will need to flash the cloud public key as well:

See instructions near the bottom :wink:

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Genius! Thank you so much!