Hi @ilko_t, I use your WinSetupFromUSB 1.3.. this month I want to add UEFI supprt to my USB. I changed it to FAT32. I have win7aıo and win8 aıo. win7 is 4,7 GB and win 8.1 is 5,3 GB. I install the latest windows 8.1 update 1 adk to my computer. I convert my windows 7 install.wim to esd with this command: set workfold=%cd%Set dism=%workfold%\amd64\Dism%dism%\dism /export-image /sourceimagefile:%workfold%\install.wim /sourceindex:1 /destinationimagefile:c:\install.esd /compress:recovery%dism%\dism /export-image /sourceimagefile:%workfold%\install.wim /sourceindex:2 /destinationimagefile:c:\install.esd /compress:recovery%dism%\dism /export-image /sourceimagefile:%workfold%\install.wim /sourceindex:3 /destinationimagefile:c:\install.esd /compress:recovery%dism%\dism /export-image /sourceimagefile:%workfold%\install.wim /sourceindex:4 /destinationimagefile:c:\install.esd /compress:recovery%dism%\dism /export-image /sourceimagefile:%workfold%\install.wim /sourceindex:5 /destinationimagefile:c:\install.esd /compress:recovery%dism%\dism /export-image /sourceimagefile:%workfold%\install.wim /sourceindex:6 /destinationimagefile:c:\install.esd /compress:recovery%dism%\dism /export-image /sourceimagefile:%workfold%\install.wim /sourceindex:7 /destinationimagefile:c:\install.esd /compress:recovery%dism%\dism /export-image /sourceimagefile:%workfold%\install.wim /sourceindex:8 /destinationimagefile:c:\install.esd /compress:recovery%dism%\dism /export-image /sourceimagefile:%workfold%\install.wim /sourceindex:9 /destinationimagefile:c:\install.esd /compress:recoverynow it's size 3,06 gb and it fits good with FAT32. I changed it's name install.esd to install.wim, but windows 7 didn't read from install.wim now. after that, I put my "windows 7 install.wim, $OEM$ folder and autounattended.xml" to windows 8 set up dvd. and it worked very well on virtual machine. and after that with WinSetupFromUSB, I decied to add this to my USB, and first it acted like it's a windows 8 dvd and created and copied to WINSETUP\W81 and on windows boot manager screen it shows windows 81. anyway, I changed "WINSETUP\W81" to "WINSETUP\W7_SP1". after that, I download Visual BCD Editor from http://www.boyans.net/ .. I load the bcd file from "myusb\boot" folder and here is what I changed that. all is the; aplication device from "W81" to "W7_SP1", description from "Windows 8.1" to "Windows 7 SP1" and OSDevice to W7_SP1 but when I try to boot, it couldn't find the usb device. here is the error;: here is the Visual BCD Editor screen: