Downgrade Android 10 to Android Oreo

[VEL_ASSA]

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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[Yachendra]

AsusYouzr

https://zentalk.asus.com/en/discussion/comment/154402#Comment_154402

I don't have computer access now..can i downgrade without computer... Like flash from memory card in stock recovery mode ??

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No.....................

[VEL_ASSA]

But , recovery bootloader goes to black screen or dark.
How to fix this?
Device not certified in play product. How to fix it?

[VEL_ASSA]

Which built no.
support native video calling?

[SUNIL_PARJAPATI]

Please tell me downgrade pie 087 to OREO build 338 with help of computer simple method please