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For that version there was never a ESX image, since it was a refresh build. For the first 50 release 50.28 it is available though.

The earliest build I can download from Citrix is 55.18 - if I could get a hold of the 50.31 firmware that would be good enough and then downgrade a later build

I could send you this

build-12.1-50.31_nc_64.tgz

.

That would be a massive help, thank you!

Sent you a link via DM.

Mate you are a legend - downloaded, thank you so much!

No problem.