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[Ultimate] Fastboot boot [name].img -> FAILED (remote: 'Unrecognized command boot')

Rising Star I
Please tell us some basic information before asking for help:
Model Name: ROG 5 Ultimate
Firmware Version: WW-18.0840.2107.151
Rooted or not: yes
Frequency of Occurrence: every time
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
Is someone of you able to boot a recovery with the ultimate version?
I'm trying to boot TWRP but I always get the error
Sending 'boot.img' (98304 KB) OKAY [ 0.343s]
Booting FAILED (remote: 'Unrecognized command boot')
fastboot: error: Command failed
Is there anything I can do about it?
Things I've tried:
* 3 different PCs
* 4 different USB cables
* all USB Ports
* different ADB/Fastboot versions
I searched all over the place but every solution so far fails - however I was not able to find an issue related to the Asus ROG Ultimate so maybe there is something special here?

Community Legend I

Thank you I'll try that.

Didn't even know you can access fastboot.. Never tried that to be honest because the first thing I do is always to unlock the bootloader.

My last argument would then be "I said I'm rooted - root without unlocked bootloader shouldn't be possible" 😜

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I know you did 😛

Rising Star I
Thanks again... I asked there and got a solution. I feel so endless incredibly dump. I had to install the drivers twice. Once normally for the phone and one time again while it's in the bootloader. Never had to do that before with other phones so I didn't know it's "a different device" while in bootloader state.