If I have it unlocked, the cell phone is free, I'm doing the installation with a Mac, I go to the grapheneos.org page and click on install, then I attach the installation via web usb and when I unlock the oem and then when I'm going to start I don't get It gives the option to press a when unlocking the bootloader because it should be in blue but it appears in gray, it won't let me press it, it won't let me start, I can't even press unlock the bootloader