my mom's zenfone max pro m1 suddenly showing no service

Please tell us some basic information before asking for help:
- Model Name:
- Firmware Version:
- Rooted or not:
- Frequency of Occurrence:
- APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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Hi, we request you to provide us your device's latest firmware version. You can follow the below instructions to do the same: Settings -- About -- Software Information.
android 9
OPM1.WW_Phone-16.2018.2011.78-20201127
android 9
OPM1.WW_Phone-16.2018.2011.78-20201127
Android 9 with OPM1.WW_Phone-16.2018.2011.78-20201127
Hi, as we can see your device is not updated to the latest version. If you have not received an auto-update message yet, you may click on the following link to download the latest update manually, request you to read the instructions before upgrading and take a full backup of the device before. Click here: https://www.asus.com/in/supportonly/ZenFone%20Max%20Pro(M1)(ZB602KL)/HelpDesk_BIOS/
downloaded update not showing for updation with both system update tab and manually process in which we placed the downloaded file in internal and restart the phone,please help me with the issue,i dont have another phone and mom is without phone