Solutions
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djdeeles's post in How to overclock Banana Pi with stable Armbian Linux version 4.19.62-sunxi was marked as the answerAlso you need to adjust voltage controller as below. I also attached my dtb file.
Goodluck. If you find something useful please let me know.
dcdc2 { regulator-name = "vdd-cpu"; regulator-always-on; regulator-min-microvolt = < 0xf4240 >; regulator-max-microvolt = < 0x16e360 >; phandle = < 0x03 >; }; dcdc3 { regulator-name = "vdd-int-dll"; regulator-always-on; regulator-min-microvolt = < 0xf4240 >; regulator-max-microvolt = < 0x16e360 >; phandle = < 0xae >; };
sun7i-a20-bananapi.dtb