Security prevents usb startup drive?

[cSalmon]

Using a MacBook Air 13” 2018 I’ve created a Mojave usb startup thumb drive to do a clean install however whenever I restart with option held down I get a message stating security prevents usb startup disk hold down command r on restart

I’ve gone through this loop where it does an internet recovery spinning globe and it takes time and then I’m right back where I was

I’ve turned off my encrypted disk, what other security do I need to turn off in order to do a usb drive clean install?

Any help is very appreciated as I’ve been trying this for a good part of the afternoon

Thanks

 

[CoastalOR]

The problem is probably the setting of your T2 security chip.
https://support.apple.com/en-us/HT208862
https://support.apple.com/en-us/HT208198
https://support.apple.com/en-gb/HT208330
https://www.apple.com/mac/docs/Apple_T2_Security_Chip_Overview.pdf

 

[jpn]

Using a MacBook Air 13” 2018 I’ve created a Mojave usb startup thumb drive to do a clean install however whenever I restart with option held down I get a message stating security prevents usb startup disk hold down command r on restart

I’ve gone through this loop where it does an internet recovery spinning globe and it takes time and then I’m right back where I was

I’ve turned off my encrypted disk, what other security do I need to turn off in order to do a usb drive clean install?

Any help is very appreciated as I’ve been trying this for a good part of the afternoon

Thanks

have you ever turned on Firmware password on yr T2 device?

 

[cSalmon]

Thanks for the responses I hadn’t on the air I had on the MacBook Pro that’s why I was stumped anyways I finally got everything aligned right to do the clean install

Thanks again for the help