Crack the hood open to see ROM stickers? You can also read current FW for 
backup. Instruments of this era usually have 27C series UVROM. 

You can see ROM location on Image 22 here:

On February 15, 2018 9:28:30 AM GMT+08:00, "Dr. David Kirkby" 
<> wrote:
>I've got a 3457A, but I have no idea of the firmware version, as it
>not report it when it powers on. I guess there must be some way to find
>out, but it was not obvious from a few minutes playing with the
>Does anyone know how to find out, or if it can be upgraded? I've just
>for calibration on another instrument, and Keysight will update the
>firmware for no extra charge.
>Dr David Kirkby Ph.D C.Eng MIET
>Kirkby Microwave Ltd
>Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex,
>6DT, United Kingdom
>Registered in England and Wales as company number 08914892
>Tel 01621'680100 / +44 1621-680100
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