Manually tried to update 087 build but it says this update is for 15.2016.1906.340, give me solution

Please tell us some basic information before asking for help:
- Model Name:ASUS_X00TD
- Firmware Version:QKQ1.WW_Phone-17.2017.2006.429-20200614
- Rooted or not: bootloader relocked recently
- 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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Version 15.2016.1902.340 is Android 8.1.
Version 16.2017.2009,087 is Android 9
Android 8 ==> upgrad to Android 9 is O.K.
Android 9 ==> update to newer version's Android 9 is O.K. too.
But, your Phone's version 17.2017.2006.429 is Android 10.
Android 10 ==> Cannot be updated with Android 9's firmware.
You are currently on 429 which is Android 10 beta build.
So you cant upgrade it with 087 which is a Android 9 pie stable build.
To get Android 9 pie 087 stable build, you have to manually downgrade to Android 9 first.
Go to asus firmware page, there is a downgrade firmware for Android 10 which will install Android 9 pie 060 build .
After that you will get FOTA updates to latest pie 087 build.