Revised Guide to WIMBooting your Dell Venue 8 Pro and freeing up space Version 1.8 - new ISO 1.2 to account for newer DV8P partition setup. Applying WIMBoot to a DV8P can get you about 12 GB extra disk space. I WIMBooted my 5 month old DV8P with all kinds of software on it. Originally, there was only 6.1 GB free. Now there is 18.3 GB free. This procedure is based upon ideas from EddCase, MS TechNet, and others. The scripts were based on MS TechNet information. My goal was to create a procedure that should work with most DV8P tablets. This procedure has been tested many times by several users. === Disclaimer - I do not claim that this works at all. Use at your own risk === === Prerequisites ==== A fully charged Dell Venue 8 Pro with WINRETOOLS partition and all partitions backed up. A working backup is your safety net. The PBR image is needed if you want to re-install Windows for this procedure. See the bottom of post for instructions on how to backup using Macrium Reflect. 16 GB USB flash drive (revised upwards for bigger Windows) USB keyboard OTG cable USB hub optional ==== Brief Overview === Download files. Build WinPE USB drive with the downloaded ISO. Update Windows 8.1 to 8.1.1 and clean it up. Boot to the WinPE USB drive which does all the work - takes two hours or less. === Section One ====== Download files Download WinPE_DV8Pv1.2.zip. https://onedrive.live.com/redir?res...391&authkey=!AB3t3EFM_ttP_qA&ithint=file,.zip Download Windows8.1-KB2919442-x86.msu. Download Update for Windows 8.1 (KB2919442) from Official Microsoft Download Center Download Windows8.1-KB2919355-x86.msu. Download Windows 8.1 Update (KB2919355) from Official Microsoft Download Center Extract the contents of WinPE_DV8Pv1.2.zip => rufus.exe, WinPE_DV8P.iso. === Section Two ====== Build WinPE USB drive Plug in the USB drive. Find rufus.exe using Windows Explorer and double click on it. Select the USB device, File system = NTFS. Click on the CD icon to find and select the extracted WinPE_DV8P.iso. Set Label = WinPE 5.1 Click Start. Confirm. Click Close. Copy the *.msu files to the WinPE USB drive (required). Optionally, copy the *.msu files and CleanImage.cmd from the WinPE drive to your microSD D:\ drive so that the DV8P can stay AC powered at a later stage. If you are not using the standard DV8P partition setup and the WINRETOOLS partition does not exist, you will need to copy your 8.1 WinRE.wim to the WinPE USB drive root. Test the WinPE USB drive by booting to it. To boot to the USB drive, press and hold the Windows start button, press the power button briefly. When the Dell logo appears, release the start button. Press the volume up button to go to the boot selector. Press volume up to select the WinPE drive. Then press volume down to boot from the selected drive. This is a reliable way to boot to other drives with the DV8P. Reboot to Windows by closing the command window by pressing on the X close button. The first USB boot runs a test script. Subsequent boots run the full WIMBoot script. === Section Three ===== Set up Windows for WIMBoot Plug in the power cable. In this section, you will set up a version of Windows similar to your original DV8P installation. If instead, you choose to use your current version of Windows, update it to 8.1 update 1, CleanImage.cmd, sysprep\sysprep /oobe /shutdown. and jump to Section Four. Reinstall Windows via Change PC settings > Update and Recovery > Recovery > Remove Everything and Reinstall Windows. This will wipe out your Windows and your personal files and data. When you get to the first Windows screen: Region and language, plug in a USB keyboard. Press SHIFT CTL F3 to go to Sysprep mode. Windows will reboot. You can plug in the power cable again. Press the Metro desktop button Ignore the sysprep window Turn Encryption off, because if you do not, the script to convert to WimBoot may fail. Right Swipe > Settings > Change PC Settings > PC Devices > PC Info > Turn off encryption Here you can install Dell fixes and updates and other software. If it needs a reboot, do so. Plug in the WinPE USB drive. Find the *.msu files using Windows Explorer. Do the following in the specified order: Double click Windows8.1-KB2919442-x86.msu Double click Windows8.1-KB2919355-x86.msu Accept the restart option After the restart, press the Metro desktop button. Using Windows Explorer, find CleanImage.cmd on your WinPE USB drive. Select CleanImage.cmd and right click it. Select Run as administrator. In the Sysprep window, select OOBE and shutdown and click OK. Windows will shutdown. === Section Four ==== WIMBoot your DV8P Plug in the WinPE USB and boot to it. If you accidentally restart Windows, do the sysprep step again. The WinPE USB Boot drive will start the WIMBoot process. Then it will repartition your DV8P drive. Then it will install Windows WIMBooted. Try not to disturb the command window by touching inside the window. The output may hang. When it is all done, power down the DV8P by pressing the power button for over ten seconds. Then power it up. Set up your new Windows if necessary. If you are not using a new stock Windows, set up a temp local account, sign out and sign back in as your previous MS account. Delete the temp local account. Search for prompt Select Command Prompt and Run as administrator. Run: reagentc /enable === All Done === You can save the WinPE USB drive as a disaster recovery backup. Do not modify or move the DV8P Images partition. The file pointers on C:\ depends on it. If you boot from the WinPE USB drive again, it will install Windows WIMBooted overwriting everything. Have fun with this procedure. I learned a lot about WIMBoot, WinPE, and scripting trying to make this as automated as possible. ================================================= How to backup DV8P using Macrium Reflect (Free edition) 1) Install the free version of Macrium Reflect. 2) Plug in a 1 GB or larger USB drive. Use a much larger drive if you want to save your image to the USB drive. 3) Run Macrium Reflect, select Other Tasks > Create Rescue Media > Select the defaults and build your WinPE 32 bit based USB rescue media. 4) Then while in Macrium Reflect, select Image all local drives on this computer. Choose the DV8P drive. Select the destination folder and click Next and then Finish. You have now backed up your DV8P. You should test your rescue media by booting to it. To use the Reflect USB drive to restore an image, boot to the USB drive. When Reflect is ready, you can unplug the USB drive and plug in a USB mouse. If want to add touchscreen support to the Reflect USB drive to skip the need for a mouse, find C:\Drivers on your DV8P and copy it to the Reflect USB rescue media \Drivers folder. You can also find the driver files in the system32\driverstore\filerepository\pmicxxxxxxx folder. Copy the four pmic files to the USB \Drivers folder. There may be more than one pmicxxxxx folder. Choose any one.