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Upgraded the FW on Turnigy 9XR to 820. Now the Tx will not work with Phoenix Sim. I've setup a new model on the Tx and tried every protocol there is in Model Setup > Protocol including going into Radio Setup > Controls and enabling PPMSIM and setting that in the model Protocol menu. I'm now out of ideas. Any help gratefully appreciated.

Should be OK. What revision did you have before?
I wonder if I fixed the polarity setting of the PPM signal between the previous revision you had and the one you have flashed. (Note, the one you can download from www.er9x.com is r821, but reports 820 on the Version display).
Please try changing the polarity from POS to NEG (if you haven't already tried that).

Mike

I uninstalled the SIM from the PC then reinstalled it. Went into the radio Model > Protocol and set it to PPM 8 channels and changed Polarity to NEG. I also went into General menu and enabled Trainer. Not sure if the latter had any affect but it's all working now