Hi mate. I have the International version of g7 (710EM), but i think it can work on ur device. If not, u can always reflash the Stock .kdz
I use LGUP 1.14, the 1.15 not works on my pc by some reason.
https://drive.google.com/open?id=1OIRt5WMkm_0q5EisJ3277tFtfS8g_mJE LGUP 1.14
https://github.com/topjohnwu/Magisk/releases/download/manager-v7.5.1/MagiskManager-v7.5.1.apk Magisk Manager 7.5.1.apk
https://developer.android.com/studio/releases/platform-tools Platform Tools
https://drive.google.com/file/d/1FcIBNfL3_72cQwuxd2TyZSjnC-ItnNTt/view TWRP_universal.img
https://drive.google.com/open?id=1X2Eb39Whg8tuITrc9aks6FOt4iz6DAmX Kernel (*** IMPORTANT, IF U ARE ANDROID PIE, JUST OPEN THE KERNEL IN PC, EXTRACT THE ANYKERNEL FILE, AND EDIT IN NOTE EDITOR. U HAVE TO CHANGE THE "10" NUMBER TO "9" FOR BE ABLE TO WORK IN PIE. THEN U HAVE TO COPY THE MODIFIED FILE TO ZIP AGAIN AND REWRITE. NOW IT WILL WORK ON PIE ****)
I realize these steps:
1- Flash the Stock Kdz u want, I recommend the 20j on EM version, for sprint idk, but sendme anyways the link of u've selected. (U need the boot.img from kdz. Send me the link to ur specific selected kdz and ill give u the extracted original boot.img from ur kdz for u patch it on magisk manager, ive found no one for 20j on this forum, u have to do it manually or me if u dont know) Edit*** I've post u the ones i used at bottom of post if u dont want to patch urself.
2- Leave it startup for 5 min (for auto-reboots)
3-Setup ur user etc, no wifi for no app updates at start.
4-Download magisk manager 7.5.1.apk and install (open and patch the "original boot.img" ive sent u, or skip this if i provided u the patched boot.img)
5-Download spectrum[ROOT] from playstore
6-Enable Usb debug and plug to pc (wait for a request on screen and pick always, then accept)
7-Pwr-off and then hold vol.down and pwr until u are in fastboot.
8-On pc, create a folder on "C:" called "platform-tools" ("C:\platform-tools" where u will paste the zip of platform tools provided by google, make sure u dont extract the 1st folder too, only the files and folders on the root of the 1st folder on zip called "platform-tools"). Then paste in "C:\platform-tools" too the patched boot.img (boot_20j_patched.img or what u have) and the twrp_universal.img
9-Windows key and type cmd, right click and open as admin(dont close this window until u completed entire rooting). Type:
Code:
fastboot flash boot_a boot_20j_patched.img
Code:
fastboot flash boot_b boot_20j_patched.img
10-Reboot and enter the magisk app, apply the onscreen request at open.
11-Reboot one more time to OS
12-Go to fastboot again (steps 6-7)
13-Type on Cmd (the 1st window):
Code:
fastboot boot twrp-universal.img
13* U will have to do this step every time u have to go recovery, coz is boot command, not flash (do not try to flash, u will brick)
14-Wait until u are on Recovery (u need a sd card for flash anything, the recovery dont support internal memory due to LG Protection of /data /system etc... )
15-slide right and then plug to ur pc and send the kernel to sdcard via mtp (mtp its enabled by deafult)
16-go to install, pick down ur sd card and select the kernel zip, flash it and then reboot. (dont try to wipe anything, not working as i said)
17-Go to spectrum app and give admin permissions
18-Gaming profile not working, use performance instead for gaming or benchmark. Balanced for normal use, and Battery for save. There is an icon for slide bar that pick ur profile without open the app.
Now its ended up.
For more speed on phone, i recommend to debloat the smartphone using it
https://forum.xda-developers.com/tmobile-g6/how-to/lg-g6-h870ds-debloat-bloatware-removal-t3941274
Care uninstalling, if u deleted an app that u need, u will to redo all the process to make it come again, cant be flashed or installed. Write here if u want a list of safe removing (for me). For do this:
1- Open cmd with admin privilege on windows and plug ur g7 with usb_debug enabled
2-type
**U need to do the adb shell for make a recognizable command channel between Android-Windows, u cant paste the "pm uninstall" commads only.
3-Paste any command u want from 2nd post of link ive provided u.
example for uninstall a facebook service
Code:
pm uninstall -k --user 0 com.facebook.appmanager
PD: the original boot.img from ur kdz must be patched in the magisk manager before u rooted it. Ill send u the original boot.img from the kdz, u have to open the magisk manager and patch it (have to be copied to sd before patched), then copy the patched boot.img to "C:\Platform-tools" on pc. U can name it to "boot_20j_patched.img" without quotes for make the commads on step 9 work. Another name can be picked, but make sure u edit both commands on step 9 for make cmd find the file. Skip this if u use the "Edit***" way.
Edit***:
Ill post u that ive used if u want to pick it.
-This is the Kdz ive used:
https://lg-firmwares.com/downloads-file/22494/G710EM20j_00_OPEN_EU_OP_0323 for step 1
-And the patched boot.img for this kdz:
https://drive.google.com/open?id=1Y83WcVSKKtZ8TJuX37jb54FCYRxCAY59 for step 9