Need help in downgrading from Android 11 to Android 9

Hi. I'm currently in the latest firmware. I'd like to downgrade to the original firmware version that came with the phone. (Without any updates afterwards) us if possible? If so, can you help me with the process?
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@CH_ASUS @ARP @gustav20258
Hi mr.strange,
That won't be possible. You can probably visit the nearest service for the same.
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