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The various model lines of NexStar-powered telescopes each has its own firmware version history:
NexStar GPS Series CPC Series NexStar 5i/8i/8i Special Edition NexStar 6/8 SE NexStar 4/5 SE NexStar 5/8 NexStar SLT NexStar GT, StarSeeker and Tasco StarGuide CGE Series AS-GT Series (Advanced Series with GoTo) How to Upgrade Hand Control Firmware How to Upgrade Motor Control Firmware