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It was definitely a nervous week while I waited for the USB-direct cable (FTDI chipset which plugs directly from USB to the handset).
Apparently the controller is a bit sensitive, especially the V3 handsets as they use OLD technology: a phone-line connection at the handset with a DB9 serial connector at the other. With a v5 handset, from memory they use a USB printer cable so you're less likely to have issues.
It's recommended to slow the speed to "Lo" or "Mi" on the handset, but having exhausted all options multiple times I just used the normal speed and that worked. Definitely not doing it again to test repeatability.
One important thing was that I didn't flash the bootloader first as that can apparently brick it, but I had v1.7 which is the latest version anyway.
I am happy with the upgrade though - my software was c.6-7 years old and it added a lot more user-friendly tweaks to my setup.
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