Unable to Downgrade

Please tell us some basic information before asking for help:
- Model Name: ZB632KL Zenfone max m2
- Firmware Version: 17.2018.2002.29
- Rooted or not: not
- Frequency of Occurrence: na
- 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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Recently I have updated my Zenfone Max M2 to Android 10 beta. I want to downgrade to Android 9. I have downloaded WW-16.2018.2007.68.zip and tried to Update it from recovery. It shows some error messages with status 1. Please help me.
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Comments
Hi there, kindly click on the following link and download the Version Android 10 to Android P stated on the link and follow the instructions given there to downgrade to Android 9. Kindly take a full backup of the device before you downgrade. Click here: https://www.asus.com/in/Phone/Zenfone-Max-M2-ZB632KL/HelpDesk_BIOS/