Hi all,
I have since managed to perform the upgrade to GEM4.21 using HCUPDATE. I scoured astronomy forums and found out that success had blessed others provided COM1 or COM3 was used for the Prolific driver for the serial to USB adaptor and also using a powered USB hub.
Thanks for the info Nick. I did find that software, however it only works with the newer Nexstar+ hand controllers.
Cheers
Guy
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