Hollyland Solidcom C1 Pro User Manual page 13

Product Usage
Condition Two
For previously purchased Solidcom C1 and Solidcom C1 Pro headsets, the hub
and headsets need to be manually paired before use. The pairing procedures
are as follows.
Power on the hub and headset, and then use a USB-A to USB-C cable to
connect them.
A pop-up window appears, indicating a firmware version mismatch. Choose
Yes to upgrade the headset.
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