Please tell us some basic information before asking for help:
Model Name: ROG Phone 3
Firmware Version: any
Rooted or not: any
Frequency of Occurrence: any
APP Name & APP Version (If your issue relates to the app): powermaster
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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Turn on x-mode while charging. period.