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I have a mid-2010 27" iMac with macOS 10.12.5 and an external DVD - USB SuperDrive (the internal DVD drive is broken).

I can't install Windows 7 from DVD with Bootcamp. After downloading support software to USB flash drive via BootCamp Assistant, I get an error on restart:

No bootable device -- Insert boot disk and press any key.

What can I do?

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You need to convert it to an ISO. Apple's official guide

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After days and days of searches and failed attempts I managed to install windows7 with the technique described by this boy: https://www.youtube.com/watch?v=3pSFUMdzWaA&ab_channel=YassineIBNELHASSAN

  • First of all, welcome to Ask Different! :) Secondly, thank you for sharing the solution you found to your question. This makes the site very useful for many users! However, can I suggest you also add to your answer a summary of what you did? This will help users in case the YouTube video you link to is removed in future. – Monomeeth Jun 3 '17 at 0:06

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