To change the APN on your Boost Mobile LG Stylo 2 LS775, first make sure you have all
drivers and binaries to communicate with the device properly installed.
Hook up the phone to a usb port on your pc.
Install LG drivers from:
http://lgusbdriver.com/windows/lg-usb-driver-v4-1-1-0
Install minimal adb and fastboot:
https://www.androidfilehost.com/?fid=385035244224386526
Copy the four files adb.exe, AdbWinApi.dll, AdbWinUsbApi.dll, fastboot.exe from:
C:\Program Files (x86)\Minimal ADB and Fastboot OR
C:\Program Files\Minimal ADB and Fastboot TO
C:\Windows\System32 and C:\Windows\SysWOW64
Open the settings app (gray gear with background icon) in the home launcher.
Tap general then scroll to about phone and tap it.
Tap on software info, then tap the build number section 7 times.
Tap the back arrow two times then tap developer options.
Scroll down to USB debugging and tap it so it says on.
Download the file MAINROOT.zip:
https://www.sendspace.com/file/qxf0m0
Extract and copy the MAINROOT folder from the MAINROOT.zip to your desktop.
Open Powershell or Command Prompt as administrator and change directory (cd)
to the MAINROOT folder.
EX: cd C:\Users\Owner\Desktop\MAINROOT (Instead of Owner it'd be your username)
Type in step1.bat in command prompt or ./step1.bat in powershell and hit enter.
You should now be in an adb shell prompt, type in run-as con and hit enter.
You now have shell system access and you can tweak the android system with these permissions but tweaking the barebones of the linux kernel will be impossible without a full root. Selinux is the culprit.
Enter below command in the adb shell prompt:
am start -n com.lge.SprintHiddenMenu/.iot.IotHiddenMenuMain
Tap LTE setting then tap APN setting.
Tap the APN you wish to change then you will be presented with settings you can tap to change.
After you've made your changes, tap the three dot menu button at the top right corner and tap save.
You can also tap the three dot menu button in the top right corner at the APN list to create a new APN
or reset APNs to default.