[NOOK Tablet 7" Guides, News, & Discussion] ipdev:
Root your "Barns & Noble Nook 7" BNTV450 using Magisk's Patch Boot Image File option.

BE CAREFUL!

There are always risks involved when you start messing around with a device.

If something goes wrong, you may end up with a non-working "bricked" device.

This is especially true when you start flashing partitions. (In this case boot.)

Disclaimer

I am not responsible for your non-working "bricked" devices.

I have a few of my own. ;)

Requirements

Barns & Noble Nook 7" BNTV450

A computer with working adb and fastboot

USB cable

WiFi connection

Magisk Manager (Link below)

Stock boot image (Link below)

Tested on:

BNTV450-v1.0.2-20161230 Security patch October 5, 2016

BNTV450-v2.0.4-20170927 Security patch August 5, 2017

BNTV450-v2.0.5-20170110 Security patch November 5, 2017 ota update

macOS 10.13.x

Windows 7 Pro

Steps

Unlock bootloader

Boot Magisk patched boot image

Pull stock boot and recovery images from device

Use Magisk to patch pulled stock image

Test and flash new patched boot image

Notes:

Google updates were needed to get everything working correctly.

PlayServices and WebView

Mac users. As with some other devices, I had to unplug and plugin the USB cable between some of the fastboot commands.

fastboot flash boot patched_boot.img and fastboot boot bntv4-recovery.img

Magisk:

There have been a lot of changes in Magisk since I originally used it to root.

Way too many to mention so, just the basics that apply to this device.

Newer versions of Magisk use the Download directory instead of creating and using the MagiskManager directory.

Some apps search for this directory and used it to determine if the device is rooted.

If you previously used Magisk to root and have a MagiskManager directory, you will want to delete it.

To update Magisk Manager.

Use the update option, it will download and install the newest version.

To update Magisk.

The safest way is to patch the boot image again. Test and flash.

The Direct Install option works but, may lead to a non-desirable outcome.

To uninstall Magisk.

Test boot your original boot image to make sure it works.

Check with Magisk Manager, it should say Magisk not installed.

If so, then flash your stock boot image back using fastboot.

If your stock boot image will not boot, then you are stuck with Magisk patched boot images.

Hardware Keys:

Power and Volume Up = Recovery Mode

Power and Volume Down = Factory Mode

It will show on the bottom Left (Sideways on the top left) Detecting boot mode. With bootloader unlocked it flashes this message very fast so you might not see it.

I still can not produce the same results continuously across mine. The newer ones, that came with v2.0.5 seem to work but, the older ones still it's a 50 % chance if I can get it to work. The bricked ones, do not seem to register the key combo on boot.

Files Needed

Magisk

xda Magisk forum. Link

Magisk and MagiskManager Official github downloads. Link

Boot Images

Magisk patched boot image downloads. Link

Stock recovery and boot image downloads. Link

Credits and Thank You:

[MENTION=4470081]topjohnwu[/MENTION] - The creator and brilliant mind behind Magisk.

Everyone who has helped me learn through the years.

:)

Last edited 23.Sep.2018