Hello, thank you for your answers
I did not program the USB boot mode on the USB key! I copied the OS before configuring the USB boot mode on the SD card, I think that comes from the the problem! I copy the SD card to the USB and then I put the SD card to configure it in USB mode, I restarted the Raspberry PI and then I deleted the added line to use the SD card elsewhere, after that I connected the USB and turned on.
On the OS that resides on the USB, you have to change cmdline.txt and also /etc/fstab so that they stop making reference to mmcblk0p2 and instead replace that with the device name of the USB stick. ........
I did not understand or put these changes! on the SD card before the copied?
Have you tried installing a fresh download of the current Raspbian Operating System image directly onto the usb key?.......
(If your usb memory key were incompatible I think it is more likely that the RPi would fail to boot at all.)
I also think that this is another problem than the USB, but otherwise, I have already done a lot of configuration on the Raspberry PI, so I would like to work with this OS already configured!
For the version of the OS I have already accidentally updated my RaspberryPI see this post (viewtopic.php?f=91&t=214889&p=1322644#p1322644