Y_ASUSDowngrade is not only esy process.
Sorry, we've checked with relevant teams about the sound quality. In the meantime, if this is affecting your normal use greatly, you may choose to downgrade. You can find the file and instructions in the description "Version MaxProM1_downgrade_to_9": https://www.asus.com/supportonly/ZenFone%20Max%20Pro(M1)(ZB601KL)/HelpDesk_BIOS/
Thanks for your understanding.