Dont remove usb cable before updating finished

This is particularly true with cheap low quality USB devices and cables.The easiest way to determine if the USB device itself is the problem versus the Mac USB port, is to try and use at least two different USB devices and switch their ports.When I boot-up those are the only options, despite having a USB stick plugged in then going into the BIOS and setting the UEFI USB stick as the primary boot device.The USB device is fine as I can see it in Windows/Linux and can read the files. This option can be found in most BIOSs called the Compatibility Support Module or CSM.While there may be several reasons (or no reason) for USB ports ceasing to function with no cause, the good news is that it’s typically a very easy fix.

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Mine was to press In some BIOSes you need to rearrange the order of booting HDD also.Sometimes resetting the NVRAM / PRAM on a Mac can help resolve the USB port failure as well, since NVRAM holds various data about keyboards, mouse, trackpad, and other USB components.Here is how you can perform the NVRAM reset on a Mac to see if this resolves the USB failure: When the Mac boots back up again, USB should be working as usual.Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.Visit Stack Exchange I can't boot from USB even though the BIOS is set to boot from USB first.

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