my account unlocking error android 9.xx redmi note 5 (whyred)

Hello, I am trying to remove MI account from a redmi note 5 (whyred) with octoplus dongle through the test point method, before finishing the process I get this legend Unfortunately, Android 9.x isn’t supported for right now !, my question is, can you go back to the previous version
of android without the phone breaking?. IF I CAN, WHERE CAN I DOWNLOAD TO FLASH TO ANDROID 8.1?
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