How to downgrade from A12 to A11?

[Pheebau]

Hi,
Android 12 installed automatically overnight and I can no longer place or receive calls on 4G/5G. It seems like I am not the only one with this issue in the US.
I did search and couldn't find a thread on how to downgrade.
Would someone be kind enough to help me with this? Where can I download A11 for the US and how to downgrade?
Many thanks in advance

[ASUS_Bot]

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