[LG Stylo 2 Plus Guides, News, & Discussion] OldAzzNoob:
Prerequisites:

ADB installed on your computer

Debugging and MTP enabled on your phone

A fast, reliable SD card (drop the money on the expensive one)

MS550 ADB drivers installed on you're computer

If you have problems with the device drivers installed , you will need to install LG Bridge app that contains the device driver here:

LG Bridge

Get a Simple ADB App Installer here: Google Drive

Or here: Rootjunky

Unzip the Simple ADB App Installer directly to your desktop. Look for the file called 1 Simple ADB app installer V2.bat and click it. This will install the ADB and fastboot files to your desktop.

On your phone, go to Settings and scroll to About Phone and select it.

On the next screen scroll to Software info and select it.

Now click on Build number 7 times and that will unlock the Developer Options menu in settings.

Click the back button twice to get to the main settings screen and select Developer options, then click OK on the popup.

Scroll down to USB debugging and turn it on. (Your phone can't plugged into the computer to do this)

Now scroll down further and find Select USB Configuration and select it. On the next screen select MTP (Media Transfer Protocol). Click Use Always and then Use Always again.

Now you're ready! Now would be a good time to backup everything on you're external SD card because this process will wipe EVERYTHING on it.

Plug you're phone into the computer (preferably with the data cable that came with the phone. I've had experiences where I couldn't transfer data using aftermarket cables). A window should pop up asking for permission for the phone to be connected to USB debugging. Go ahead and allow it.

On the desktop of you're PC, press "shift" and "right click" at the same time. Select the "Open Command Window Here" option.

In the command window type:

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adb devices

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**Then hit "enter". You should get something like this as a response:

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C:\Users\Michael\Desktop>adb devices

List of devices attached

* daemon not running. starting it now on port 5037 *

* daemon started successfully *

LGMS550f1a80a device

c:\Users\Michael\Desktop>

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**Now enter the following commands, hitting enter after each line, and in order:

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adb shell sm list-disks

adb shell sm list-volumes all

adb shell sm set-force-adoptable true

adb shell sm partition disk:179,64 private

adb shell sm set-force-adoptable false

adb shell sm list-volumes all

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The fourth command partitions your SD card, so it might be a couple minutes before it finishes.

** Please don't forget this part **

Disconnect your phone from the USB cable, go to Developer Options and disable USB debugging, then reboot it. It might take longer than usual to boot this time (mine didn't).

Once you're phone is fully booted, go into Settings, scroll down to Storage & USB, and tap on you're SD card. Tap the three dots in the upper-right corner and select Migrate data. This process might take a few minutes but, POOF... you're done.

[[Don't give me any credit for this. I just did a bunch of Googling and experimenting on my phone to see if it works. I CAN tell you this though... this process didn't work when I had my bootloader unlocked and TWRP and SuperSU flashed to my phone. (For rooting your MS550, go to the [Recovery] Twrp v3 For Lg Stylo 2 Plus thread)

Credit goes to ORaMI for the tutorial, Rootjunky for the ADB installer, and messi2050 for the link to LG Bridge for the drivers.]]