Help Unable to launch the "load factory fastboot"

[TheMatrix502]

I have a Huawei mediapad M5 tablet, when I launch the “Load Factory Fastboot” on Chimera it shows me this message below:

Load Factory Fastboot
14/01/2022
18:26

Load Factory Fastboot
14/01/2022
18:25

Load Factory Fastboot
14/01/2022
18:22

Loading factory fastboot
Uploading Fastboot...
Selected version: kirin960_extracted_v99
Uploading data...
Uploading data...
Uploading data...
Rebooting the device to Fastboot mode...
Waiting for Fastboot device to appear...
Fastboot device not found
Finished at local time: [01.15.22 08:42:07]
WorkID: 166030963

The device disconnects but does not turn on again until after a few minutes and the mode is not activated.

What should I do?