SOLVED!

Steps:

i) Follow the instructions in the links bellow to use the bypass tool (python script). You will need to press the up an down buttons so that Windows can detect the device. After running the bypass python script I obtained this and the device was shut down.

ii) I did NOT turn on the device. Then I use the ROM file (fastboot) provided here

https://xiaomistockrom.com/xiaomi-redmi-9a

and the Mediatek SP Flash tool with this instructions to flash to the device

https://xiaomistockrom.com/xiaomi-redmi-9a

@siriusf SOLVED!

Steps:

i) Follow the instructions in the links bellow to use the bypass tool (python script). You will need to press the up an down buttons so that Windows can detect the device. After running the bypass python script I obtained this and the device was shut down.

ii) I did NOT turn on the device. Then I use the ROM file (fastboot) provided here

https://xiaomistockrom.com/xiaomi-redmi-9a

and the Mediatek SP Flash tool with this instructions to flash to the device

https://xiaomistockrom.com/xiaomi-redmi-9a

My Xiaomi Redmi 9A phone is stuck in a boot loop and not recognized by the computer anymore.

I have been trying to solve the issue and I think is related with MediaTek's authentication that some how the mediatek SoC became locked in the UBports installation. I bought the phone brand new and I carefully follow the OEM unlock steps following Xiaomi instructions. I created a Xiaomi account and used the Xiaomi Mi Unlock tool. I waited the week required to unlock the phone by Xiaomi and then sucessfully unlocked the device. But I think that somehow the chipset became locked and the device enter in a bootloop only able to see the Redmi logo. No matter which combination of keys I try I cannot make the phone enter in Fastboot or being recognized by the PC. But then I tried to follow this steps

https://www.xda-developers.com/bypass-mediatek-sp-flash-tool-authentication-requirement/?newsletter_popup=1

https://www.99mediasector.com/trick-to-bypass-mtk-sp-flash-tool-authentication-protection-disable-daa-and-sla-auth-file/

and playing with the keys I was able to make the computer recognize the phone, with a USB driver filter but at the moment that the Mediatek tool is going to upload a ROM the phone is not longer accessible.

Any ideas?

@MrT10001 Thank you for your response, I wil try that.

@siriusf ubports-installer_0.9.10-beta_win_x64 on Windows 11

Hello.

I buyed a brand new Xiaomi Redmi 9A smartphone with the intention of installing Ubuntu Touch on it. I succesfully unlocked the phone using the Xiaomi application intended for it and enabble developer mode. UBports detected the exact model of the phone and started flashing the firmware. At some moment it restarted or rebooting the phone and it was stuck on the Redmi Logo restarting over and over again for several hours. At some moment I decide to remove the phone from the computer and I have not been able to get the phone of the endless rebooting cycle. I tried the volume down + power button combination several times without success and then I tried to install the Android SDK tools for window, plugged the phone in and tried 'adb devices' the phone as not recognized. What can I do?