macOS Big Sur : cannot create USB bootable drive
I'm running macOS Big Sur 11.1 on a MacBook Pro 2019 with 64GB RAM and 1TB SSD and want to create an USB bootable installer with a terminal command as communicated on Apple support website.
I'm using a 64GB USB key that I'm formatting with Disk Utilities as Mac OS Extended.
Everything seems to run fine and the Install app is correctly copied to the USB key (12,24GB). However, at the end of the process, the command should make this USB key bootable in order to be able to start on it. At this stage, I get an error : "Making disk bootable... Couldn't extract BaseSystem to path:
/Volumes/Install macOS Big Sur/BaseSystem The bless of the installer disk failed."
Has anyone encountered the same issue and get it solved ?
Thanks to the community in advance :-)
MacBook Pro 16″, macOS 11.1