In addition to the HC 1.62 beta firmware, ¸é±ð²Ô¨¦ suggests that you try the Gemini L6.03 beta firmware. This may be necessary to support the gearbox reversal feature, but also has some improvements in PEC precision and PEC drift removal.
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6.03 firmware is located in the same folder:
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Regards,
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? ?-Paul
Paul Kanevsky