How to downgrade asus max pro m1 pie 087 to oreo

Please tell us some basic information before asking for help:
- Model Name: asus zenfone Max pro m1
- Firmware Version: 087
- Rooted or not: not rooted
- Frequency of Occurrence: downgrade pie to oreo
- APP Name & APP Version (If your issue relates to the app): downgrade
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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How to downgrade asus zenfone Max pro m1 android pie to oreo through PC full method and all links plss plss
Comments
Hi, we suggest you to please visit the nearest ASUS service center for better assistance. Locate here : https://www.asus.com/in/support/Service-Center/India
You will need to unlock bootloader and Install Twrp recovery and then flash orea firmware through the recovery to downgrade. Do some googling or watch some videos on youtube regarding this.
No need to unlock bootloader.
@rahulraman066
Just flash any Oreo fastboot ROM.
If you can, follow below XDA forum link to do by your self or visit nearest store to get downgraded.