[Dell Venue] wirebook:
Full Disclaimer: All credit for this goes to [MENTION=6928935]enzymeyllw[/MENTION], whose guide I followed. It looks like that guide has gone offline (and has been cloned on a few dozen shameless websites), so I thought I'd rewrite it for the sake of anyone else needing help. All of the files can be found around this site, and I'll do my best to update this later with links. But for now, I'll post the instructions. Additional thanks goes to [MENTION=4026388]xBIGREDDx[/MENTION] and [MENTION=6460009]anggusss[/MENTION]. Hard to imagine my device has been bricked for the last 9 months... (Also, kinda funny how I just posted this and it has already been ripped off on >3 other websites.)

What you'll need:

Phone Flash Tool: https://01.org/android-ia/downloads/intel-platform-flash-tool-lite

Open-Source Firmware Files: http://opensource.dell.com/releases...s_rd_opensource-blankphone-userdebug-1397.zip

Tethered Root for Windows (Thanks to [MENTION=4821597]social-design-concepts[/MENTION] for this): http://xdaforums.com/android/development/intel-android-devices-root-temp-cwm-t2975096

-or-

Tethered Root for Linux / Mac (Thanks to [MENTION=2472806]vampirefo[/MENTION] for this): http://xdaforums.com/dell-venue/general/linux-tethered-cwm-recovery-version-t2963104

System and Boot Images (Thanks to [MENTION=4026388]xBIGREDDx[/MENTION] for these):

- System.img: https://mega.co.nz/#!w9AjBCSI!YdQenTLDVVk0M9xx1LJT1OnKq5VhESgiyULA1FVIA8A

- Boot.img: https://mega.co.nz/#!Fk4FUSza!1gY1RjvnEI_HS0zk17WTHiywXFWc1VOCH-P2V5fVFPI

1. Phone Flash Tool

- Install USB drivers (if on Windows)

- Install Phone Flash Tool Lite

- Run PFT, open "Dell_Venue_8_7840_Lollipop_5.0.2_qs_rd_opensource-blankphone-userdebug-1397.zip"

- Select "flash-DD0_BB.xml" and flash it

- Tablet will restart in bootloader, flashing isn't done yet, so wait

- Sometimes it can be hard to get the progress bar past 4% before things fail. Just keep trying if this happens, it'll randomly work.

2. Tethered Recovery ("IntelAndroid-FBRL-07-24-2015.7z")

- Unpack the system image (from "system.zip") to a convenient directory

- With tablet still in Bootloader mode, open app, select CWM mode, then T4

- Phone will restart in CWM once everything loads

3. Flash system

- Go to the mounts / format area, format "/system" and then unmount it

- Insert Micro SD card and mount it

- Format "/external_sd"

- On computer, type "adb push <path-to-system.img> /external_sd/", wait for it to finish

- When finished, type "adb shell" to enter the device shell (make sure the prompt is "~ #" to make sure you are root (or type "whoami" at the prompt to confirm root)

- (If not root, restart to bootloader and trigger the tethered recovery again. You should be root this time.)

- Type in "dd if=/external_sd/system.img of=/dev/block/by-name/system" and wait for it to finish

- When finished, type "exit" on your computer to close the shell

- Reboot the device (to bootloader)

4. Flash boot

- Back on the computer, type in "fastboot devices" to confirm the tablet is connected

- Type "fastboot flash boot <path-to-boot.img" in order to flash the boot

5. Reboot

- On the device, tell it to boot normally

- Wait. It's a first-boot so it's gonna be a bit slow as the cache is built and whatnot

6. Enjoy!

7. (Optional) Root using the Update-SU.zip using the tethered mode again.

I noticed that it won't take any updates so this leaves you vulnerable to the Stagefright bug. It also sometimes boots to the bootloader and waits to you to select normal boot. Sorry. (Anyone know how to help?)