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After update 78 I can not change the refresh rate of the screen

Star II
Please tell us some basic information before asking for help:
Model Name:
Firmware Version:
Rooted or not:
Frequency of Occurrence:
APP Name & APP Version (If your issue relates to the app):
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.
Please help me

Community Legend III
@dolevnadav1992 Sorry for the late reply,
Are you still having problems with this?
If so, please check Power Master and check that you're not running a battery mode that limits you to 60 Hz.
It can also be that a simple reboot will solve your problem.