Breff, the panel has 2 NVMs fitted and is running v3.3

All Premier 88 PCB’s prior to issue 13 were fitted with two 24LC128 in the sockets labelled U9 and U10.

From issue 13 onwards, they were fitted with a single 24LC256 in the socket labelled U10. If the PCB is

prior to issue 13 or has two 24LC128 fitted, they must be removed and a single 24LC256 fitted to the

socket labelled U10.

I seem to remember that there is a year date on the pcb, the year date determines what software can be put in. I know that v8 needed more memory to cope with extra functions/ more log events

There you go, spot on PSE

I've got the following firmware available, V8.02,  V8.13, V8.15,  V9.02, 

Thanks Breff and PSE. I will check which NVMs are fitted tonight, the date code on the PCB is 10/09/02

The NVMs in U9 and 10 are 128s. Shall I change to a single 256 or can I still update with the 128s?

Change to a 256 or you will have a door stop

Would the 24LC256 need programming before being fitted onto the PCB?

No

What software version would be best once I've changed the chips to a single 256?