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Thanks Mark! You really are a god! Will have a go.

Moral of the story, when programming FTDI devices unplug anything else that is on USB or prepare for the possible consequences!

No way of writing protecting those things?


There's a tick box marked "Only program blank devices", which is fine and would work, but when you're needing to make changes to the eeprom on an already programmed device you obviously need to untick this.

The tool appears to just program anything and everything that is an FTDI device on the bus!