If you have 5 TFPs that means you have additional CS2 and/or boosters

The error is probably due to a CAN bus failure which may be a cable/connection OR one device has a driver that is on its way out.
Note: A device that has a faulty (re)driver may work ok by itself but may cause problem for communication with others "on the bus"

First disconnect the CAN/System bus cable(s) from your CS2 and make sure it comes up cleanly , checking the version of its internal TFP
If you do have other CS2s as a slave I suggest updating them separately (with no devices attached)
For your boosters, connect then singularly, one at a time to the CS and retry the update.

I have had experience with what I describe as CAN bus driver failure of a CS2 (with similar symptom) .
Being used as a slave at the time, it needed to be taken out of circulation for "funnies" with other devices to disappear

Thanks for your help Peter, your advice was sound.

My only devices are one booster and a MS2. I unplugged them both and there were no TFP updates requested on CS2 boot up.

I then plugged the booster in and on boot I was prompted to update device fffffff as per my photo - but this time it did update. There was no other TFP update request.
After another shutdown and boot this time with the MS2 also connected, there were no further requests for TFP update.
I don't know what happened to the second TFP update request but it does not appear anymore.

So it can be said the problem is resolved since one of them updated and the other no longer appears.