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Trying to update it to windows 10 using boot camp

After the install finishes it flashes and doesn’t stop until I turn it off then back on then it says no bootable device please insert and press any key when usb drive with windows 7 on it is in please help

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Did you try pressing the "option key" while trying to boot from your usb?

https://www.macworld.co.uk/how-to/mac/wh...

BTW, just so there is no confusion, the usb needs to be bootable and not just have a Windows 7 ISO (or whatever format) file copied to it. If the usb is not bootable, the computer won't boot even if you can try booting from the option key; you will receive the same error message as before.

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Is the USB bootable? (Not just iso/dmg just dumped on)?

Maybe also check the version, in case the Macbook is 32 bit and your installer is 64.

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