UBTECH Jimu Instructions Manual page 18

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The servo firmware versions should be consistent
If the servo firmware versions do not match, the app will perform a mandatory upgrade to the servo. During upgrading, battery power level has to be
maintained at over 50%. If battery power is lower than 50%, upgrading cannot be completed, and the wireless connection will be disconnected.
After your mobile device is successfully connected to the controller, you can view the battery power level of the model and the connection status
on the connected Model Details page.
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