Am i right in assuming flashing the new firmware will set the voltages back to default?
No, it shouldn't affect the voltages or the name of the device.
Ah ok, also , how do you set the name?
To set device name use:
cgminer --hfa-name "name"
How about for different devices(habs) on same cgminer instance?
Device name is saved to the board flash so you need to set the device name only once for each board.
Use "--usb" to specify the board when you have multiple connected to the same system. For example to set name "hab1" for habanero board connected as device 5 from usb bus 2 use:
--hfa-name hab1 --usb 2:5
To get the usb bus ID and device ID use "lsusb" as described in cgminer ASIC-README file.