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[GUIDE] Root, TWRP, CustomROM (for KOT49I.V50020D)

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By unroot_, Junior Member on 3rd October 2014, 03:25 AM
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Hey everyone,

today I got myself an LG G Pad 8.3 because I liked the hardware. Unfortunately, LG's software ist almost as bloated and ugly Samsung's [citation needed]. After a lot of searching through this forum and elsewhere i finally managed to get this tablet from KOT49I.V50020D (KK 4.4.2) to CM11. As all the other guides are for older versions/builds of the OS and never cover the whole process I'm trying to do a little tutorial here. It was a little harder than rooting my Nexus5, so I don't really recommend this for newbies.

Credits to the respective creators of the software, hacks and methods used in this Tutorial. I didn't do any coding or magic.

As always: No guarantee this will work for you!
I am not responsible for what you do with your tablet, phone or life.


The first thing I did was to root the G pad using IOroot (Credits to autoprime).
1.1. Enable Dev.-Options by clicking the build-number 7 times.
1.2. (while your G Pad is not connected to a PC) enable USB Debugging
1.3. Connect to your PC, You will need the LG Drivers
1.4 Unpack the Zip-File from the thread and open a commandline in the folder
1.5 Check communications using "adb devices"
1.6 "adb reboot recovery" to boot into recovery mode (obviously)
1.7 move to "apply update from adb" using the volume-rocker, select with the power button
1.8 (On your PC again) "adb sideload kk_root.zip"
1.9 The installer will do its thing, you should see "DAT ROOT" when finished
1.10 reboot your system (see 7.)

In the next step, you will install a custom recovery.
Or lets say, you will let a script install a custom recovery for you. (Credits to Drgravy, id10terror and samuraix21)
2.1. download the zip-file from id10terror's thread (his Step3). The download may be slow
2.2. unpack and right-click the *.bat-file -> Edit using an editor of your choice
2.3 change the letter at the end of the build-number according to samuraix21 (second post in his thread), then save
2.4 run the batch-file, the tablet will reboot after this step
2.5 put the newest version of TWRP on you G Pad's internal storage
2.6 repeat 1.5 and 1.6 to get into your new recovery
2.7 immediatly after the screen goes black, pull out the cable (for unknown reasons)
2.8 install -> select the recovery you just moved to the internal storage, swipe to confirm
2.9 wait until finished, go "home", reboot system

That was the hard part. Flashing CM or any customRom is fairly easy
3.1 Download the latest CM-Snapshot from here
3.2 Place that zip-file in the internal storage as you did with the TWRP-file. You can erase that one.
3.3 repeat 2.6 and 2.7
3.4 Wipe -> Swipe to confirm
3.5 Install the CustomROM as you did in 2.8. This might take a little longer.
3.6 see 2.9
3.7 The display might be very dark while booting. You can change later

If everything went right, your tablet now runs a rooted customROM =)
Sorry for this wall of text
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15th October 2014, 10:03 PM |#2  
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I rooted with Towelroot, simply install the app, click to root, install SuperSU from Play store, that's it. Nice n easy. Thanks for the guide.

Sent from my XT1039 using Tapatalk
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25th October 2014, 03:21 AM |#3  
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Just got my refurbished V500 (OTA updated twice to latest stock 4.4.2)... Done rooting & installing TWRP 2.8.0.0 using the same steps as OP stated ... Easy enough.
I had my win7 systems previously prepared for my G2, so not a single issue with drivers.
Decided to stay with Stock LG (same as my G2) ... customed ROMs can stay on my N7s.
(note: remember to allow root-access to ADB, on the tablet. Also allow SuperSU to update its binary thru TWRP).
Thanks.
31st October 2014, 09:05 PM |#4  
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After step 2.7 my g pad enters stock recovery with the following errors at the bottom:

E:missing bitmap stage_empty
(Code -1)
E:missing bitmap stage_fill
(Code -1)

I got root access, edited the .bat file to V50020d and supposedly flashed ABOOT and Recovery correctly.
Any help would be appreciated!
1st November 2014, 06:15 PM |#5  
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Quote:
Originally Posted by usernamemio

After step 2.7 my g pad enters stock recovery with the following errors at the bottom:

E:missing bitmap stage_empty
(Code -1)
E:missing bitmap stage_fill
(Code -1)

I got root access, edited the .bat file to V50020d and supposedly flashed ABOOT and Recovery correctly.
Any help would be appreciated!

I stopped at step 2.5 ... I used flashify app to reboot to recovery --> then updated TWRP to 2.8.0.0.
( At step 2.7, you already had TWRP 2.7.x.x)
2nd November 2014, 12:53 AM |#6  
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Quote:
Originally Posted by usernamemio

After step 2.7 my g pad enters stock recovery with the following errors at the bottom:

E:missing bitmap stage_empty
(Code -1)
E:missing bitmap stage_fill
(Code -1)

I got root access, edited the .bat file to V50020d and supposedly flashed ABOOT and Recovery correctly.
Any help would be appreciated!

Exact same happened to me.
2nd November 2014, 01:58 AM |#7  
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Quote:
Originally Posted by hyperxguy

I stopped at step 2.5 ... I used flashify app to reboot to recovery --> then updated TWRP to 2.8.0.0.
( At step 2.7, you already had TWRP 2.7.x.x)

Yeah, that's the problem.. After step 2.7 I'm supposed to have TWRP, but I dont. It will just enter Stock recovery with those errors on the bottom.
I also tried Flashify to flash TWRP 2.7.1.0, but as soon as I try to enter recovery it just stays at the LG boot screen with the following error: Secure booting Error, Cause: boot certification verify.
I guess I'm out of luck here.
4th November 2014, 01:17 AM |#8  
usernamemio's Avatar
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Quote:
Originally Posted by usernamemio

After step 2.7 my g pad enters stock recovery with the following errors at the bottom:

E:missing bitmap stage_empty
(Code -1)
E:missing bitmap stage_fill
(Code -1)

I got root access, edited the .bat file to V50020d and supposedly flashed ABOOT and Recovery correctly.
Any help would be appreciated!

Found a fix (technically). Thanks to @nlmensch for the idea.
Basically, I just downgraded to v50010b and installed TWRP from there.

Link for @quangnhut123 thread to make the downgrade:
http://forum.xda-developers.com/show....php?t=2797190

Link for the .kdz files (I used United Kingdom V10B):
http://lg-phone-firmware.com/index.php?id_mod=39

After the downgrade, make sure to get root access for 4.2.2 and TWRP for your downgraded firmware.
Hope this helps.
8th November 2014, 04:51 AM |#9  
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This all looks great, and I'm really thankful for the effort you've put in, but I'm stuck -- I don't know if I'm just being stupid! You said to download latest version of TWRP and put on SD card... but how? v500 isn't officially supported by TWRP, so where are people getting a copy? I looked but couldn't find it. Any help massively appreciated!!

Thanks

[EDIT: I was indeed being stupid. Worked out the relevant TWRP links were in Drgravy's threads. Many thanks )
15th November 2014, 10:36 PM |#10  
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I had the same problem with installing twrp as the others. To fix it I did a factory reset back to clean stock 4.4.2. After that the guide worked as intended and I was able to install twrp. (There must have been som app or update that interfered with twrp before. I don't know?)

To fix the dim screen when booting cm11 I installed mani.Kernel v19 in twrp after setting up cm.

Using cm I really like all the settings available, the standard navigation buttons and that the bug in stock rom that made youtube videos stutter is gone. Smooth playback. And batterylife seems better. Screen takes 75%.

Big thanks for the guide. I'm glad I followed it. And there's nothing wrong with it because I ran into the same problem with other guides.

Edit: I would recommend installing the Quick Boot app instead of rebooting to recovery using adb and yanking the USB-cable.
18th November 2014, 06:02 PM |#11  
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The TWRP part didn't work for me either. I ended up flashing a recovery image (TWRP) through flashify and it messed up my recovery and can no longer access it, luckily tablet is still working.
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