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CB86-PLUS charger under the condition that the current voltage display of CB86-PLUS is correct. The steps are as follows: 1. Before upgrading the firmware, plug the battery into the rightmost interface of port 1.
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2. Install the new firmware immediately, and then re-calibrate the voltage of CB86-PLUS charger according to the following tutorial. The power supply voltage during calibration is set to 12.003V and the battery voltage to 4.200V, which are the voltage value just recorded.
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