(x306x )Lost fastboot after ubports 24.04 installation.
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 After installing the from the rc 24.04 channel on my Lenovo M10 HD LTE I realised that the overall response of the OS was very sluggish. So I thought to revert to the proven 20.04 channel. Now comes the problem: The fastboot mode is not accessible any more. I followed and tried every link in the net. Unfortunately there is no downgrade option in the update menu. Any proven suggestions? 
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 @marlboro50 Using the installer doesn't work? 
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 @marlboro50 to boot into fastboot, start your device normally, login in, open the Terminal app and execute the command sudo reboot -f bootloader
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 @arubislander . You are a genious. Thank you. 
