[Chiron] Problem flashing custom recovery on 10.3 Stable

[Evil_Papagalli]

Hello guys,

I have a Mi Mix 2 with Xiaomi.EU 10.3 stable installed.
When I try to boot TWRP (or any custom recovery) via fastboot commands, I get the messages below:

C:\WINDOWS\system32>cd C:\ADB\platform-tools

C:\ADB\platform-tools>adb devices
List of devices attached
5e7d92b6 device


C:\ADB\platform-tools>adb reboot bootloader

C:\ADB\platform-tools>fastboot devices
5e7d92b6 fastboot

C:\ADB\platform-tools>fastboot boot twrp.img
Sending 'boot.img' (26892 KB) FAILED (Write to device failed in SendBuffer() (Unknown error))
fastboot: error: Command failed

As you can see, I'm able to run any ADB commands, but for fastboot, altough it says it's connected, I'm not able to run anything.

Already downloaded the latest ADB drivers, TWRP, OrangeFox Recovery, and I'm using Xiaomi's original USB cable.

Is there anything I can do so solve this? Or I'm going to be stuck in 10.3 forever?