There is a new FOTA update for ZenFone Max Pro ZB602KL, do update it and as it would improve the device performance.
Go to Settings > System Update
Improvements:
– Enable IN Airtel/Idea/Vodafone & ID smarfren & TH DTAC/AIS/True 3rd & RU Megafon/MTS VoLTE & RU MTS VoWifi
– Optimize fingerprint unlock speed.
-Improve Camera performance.
Model Name: ZenFone Max Pro M1 (ZB602KL)
About the product : https://www.asus.com/my/Phone/ZenFone-Max-Pro-M1/