Audio low in Head Phone after pie update

I updated my asus max pro M1 to android pie on my two device and after update one handset is giving more sound in headset and other giving very low sound output. Difference is only in headset or external speakers.
ZenFone Max Pro (ZB601KL)
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Can you tell the build number of your device
Build number in image
Hi there, if your experience has changed from how it was out of the box then, we suggest you to please visit the nearest ASUS service center for better assistance. Locate here : https://www.asus.com/in/support/Service-Center/India