I have a redmi note 9 and I've been trying to unlock the bootloader through either adb or the mi tool and it won't work because fastboot is not detected.
I've tried to install every driver i tried a lot of troubleshooting, but it does not work I cannot flash anything.
If you have got any sugestion I would be glad know.

jorge paiva said:

I have a redmi note 9 and I've been trying to unlock the bootloader through either adb or the mi tool and it won't work because fastboot is not detected.
I've tried to install every driver i tried a lot of troubleshooting, but it does not work I cannot flash anything.
If you have got any sugestion I would be glad know.

same problem, hope there is a solution

lo stesso problema, speriamo ci sia una soluzione

ti scrivo in inglese altrimenti qualcuno qua s'arrabbia ...

you should go into 'device manager' (gestione dispositivi), and right-button with mouse over the Android-yellow-triangle-icon, then property, there you will see a line that looks like \VID_0BB4&PID_0C01 , well, this is the exact device id, I guess if you own a redmi note 9 it will be a mediatek and should looks like that, then you must search for the exact driver that has included your id-device, I think you can find something here https://xiaomitools.com/all-mtk-usb-drivers-all-versions-2/ but I suggest you to download some files and then looking inside for the file 'android_winusb.inf', open it with notepad and search in the lines if your id-device is included, then, you are good to go, go to android-yellow-triangle-icon and give update driver, go manually and give the file 'android_winusb.inf', then the icon should change and named adb-interface or bootloader-interface.
Try to give command adb devices and then you will get a pop-up in the cell-phone, accept, then give back the adb devices and the result should be 123455667xxxxxx device, if device is the result you can now use adb or fastboot mode

Thanks for the reply, I have a few questions:
1) where do I find my ID (on smartphone or where )
2) where I put my ID
3) I attach the "android_winusb.in" file opened with block note.
I think you are Italian , if yes you can send me a message in Italian
if you can help me thank you

I apologize but it seems to be needed ...
installa adb e fastboot, riavvia, attacca il cell (acceso) al pc, vai su gestione dispositivi, in alto trovi l'icona con scritta android e triangolo giallo, vai sopra e tasto dx, proprieta' driver, non ricordo se al penultimo o ultimo tab sui dettagli del driver dovresti trovare la dicitura \VID_0BB4&PID_0C01\ o simile, quello e' l'ID del cellulare (vendor ID e product code ID) che al momento windows riconosce attaccato al sistema, ora questo codice deve essere presente all'interno del driver adb fastboot che vuoi che sia installato nel pc, il problema di adb e fastboot e' che non esiste un driver generico che funziona su tutti i dispositivi, ma ne esistono decine e decine in base al modello e alla casa produttrice del cellulare, quindi, compito tuo e' trovare quello che e' compatibile con il tuo cellulare, questo succede ovviamente in windows, mentre in linux queste caxxxate non esistono e quando installi adb e fastboot qualunque dispositivo vai ad installare funziona indipendentemente.
Vai a vedere se \VID_0BB4&PID_0C01\ corrisponde anche al tuo, se ok, te lo invio io il file driver di adb fastboot

Thanks, I'll check and try now