Pluto problems - blinking LED1

[Rishtonite]

Apologies if there is a better area of the forum to post this in.

Building a Portsdown4 was going ok until...

Newly purchased Pluto rev C. I thought I had bricked it but I've now got the F5OEO firmware installed and plugged into a USB3 port I can see the drive (E:) from my PC and can bring up the info page with http://192.168.2.1/

Connected to my PC via USB the ready LED is on continuously but LED1 repeatedly blinks twice (like .. .. .. .. ..)
Plugging into the Pi in my Portsdown4 it doesn't find Pluto.
I've spent a lot of time searching but been unable to find a solution.

Thanks
Barry G4IAT

[g0mjw]

What firmware did you install and what patches?

[Rishtonite]

As supplied Pluto firmware was v0.32. I then installed v0.39, then F5OEO v0.31-4-g9ceb-dirty
I'm only planning to use it locally on 23cm so have not extended the frequency range or enabled the 2nd processor.
I wasn't aware of any "patches" being needed.