When listening to music through headphones, the sound acquires the effect of echo
Hi vovaokhvat ,
This behavior is under investigation. 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.
Could you tell us your ZenFone model and firmware version(Settings > About phone > Build number)? 🙂
What kind of sound has echo? Media/alarm/call/notification?