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I'm using these instructions to refresh Windows 8 (RTM) on my Samsung Series 7 tablet. When I got to the "Insert media" screen, I inserted a flashdrive containing only the files en_windows_8_x64_dvd_915440.iso (the Windows 8 installer) and Key.txt.

The first time I tried this, the tablet came back with the error message "The media inserted is not valid / Make sure to insert your Windows installation or recovery media."

Then I rebooted and tried again. Now I don't even get an error message--it's as if I didn't insert the flashdrive at all. The flashdrive is brand new and my PC recognizes it, so I doubt that's the issue.

Any idea how to fix this?

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What is the source of the .iso file exactly? –  Ramhound Nov 27 '12 at 17:51
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2 Answers

up vote 2 down vote accepted

Use the Windows 7 USB/DVD Download Tool (never mind the name, it works for Windows 8) and create a bootable disk using the ISO file. Merely putting the iso file on the disk won't work. It needs to be made bootable with the requisite boot sectors and everything

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^what he said. The thing is, just copy-pasting the .iso file wont't make your tablet recognize it. You might have to make it a bootable flash drive. –  Gutsygibbon Nov 27 '12 at 18:30
    
Thanks! After I did that the tablet recognized it, though the refresh failed. I'm just straight reinstalling Windows 8 now. –  user460847 Nov 27 '12 at 19:19
    
Good to know :) @Gutsygibbon Did i sound too complex? If yes, I'll make my answer simpler –  pratnala Nov 28 '12 at 17:23
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haha no. Just making sure he got it :D –  Gutsygibbon Nov 28 '12 at 20:28
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This worked for me:

http://www.techfeb.com/reset-refresh-windows-8-pc-without-any-installation-media/

make sure to follow the steps carefully.

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Welcome to SuperUser! We try to avoid answers that simply link to another site as it would become useless to future users should that site be unavailable. Would you consider improving your answer by including the main steps and instead referencing back to your link? –  Graham Wager Dec 16 '12 at 16:46
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