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I have a sketch uploaded on ZUNO, however if I try to over write this with another different sketch, the original remains.

The upload doesn't indicate failure however the new sketch is not uploaded. Something is preventing overwriting.
How can I erase the sketch that is in ZUNO and upload a new sketch.

Sketch will not be applied if it changes the types of channels in an included Z-Uno. To exclude and include it again to be applied. This is a requirement by the Z-Wave protocol

I found that a Factory reset eventually worked. Still took a long time, the Z-UNO instructions on Factory reset and Rescue Mode don't seem to be very clear in this respect.