How can I delete/remove the update for Android 12?

[Ihrz]

Please tell us some basic information before asking for help:
Model Name: ROG Phone 5
Firmware Version: No firmware found / Android 11
Rooted or not: Not
Frequency of Occurrence: Just now
APP Name & APP Version (If your issue relates to the app): N/A
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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I recently got my phone back, after 2 months and 19 days from the service center. The issue? Motherboard replacement due to No WiFi function after updating it to Android 12.
I'd like to ask how can I delete the update for Android 12? I would not risk updating it again, too much of a hassle and disappointments, to be honest.
Please see attached photo, for your reference. Please help me delete/remove the one I encircled.

Thank you.

[ASUS_Bot]

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