Troubleshooting bricked LGF320S and upgrading to Android 7.1.1 Nougat

General Tips

  1. Turn off the phone. Wait for 5 secs.
  2. Hold Volume Up and Power button at the same time
  3. Keep holding until black screen with 복구모드 appears on screen. Immediately let go of both buttons.
  4. Wait for 3–5 seconds for recovery mode menu to appear.
  1. Turn off the phone. Wait for 5 secs.
  2. Hold Volume Up and Power button at the same time.
  3. Let go of both buttons when LG splash screen comes up.
  4. Immediately hold Volume Up and Volume Down button at the same time for 3–5 seconds until Factory reset menu comes up.
  1. Turn off the phone. Wait for 5 secs.
  2. While holding the volume up button, connect the phone to PC via USB cable.

Enter 3845#320# into phone

Make sure Developer mode (tap Build number/version 7 times) + USB Debugging is always on!

Check the firmware downloads match the phone model (LGF320S).

Make sure phone is fully charged before beginning this process.

Bricked?

If you can’t enter recovery mode, see tiny “secure booting error” during booting process, or see many partition drives when you plug the phone into PC (on Windows, check device manager — Other ports — if it has qualcomm xx, it’s probably been bricked because when PC can’t access the phone, it goes to firmware by default), the phone is bricked. Here’s how to unbrick:

  1. Download SRKTool (https://forum.xda-developers.com/lg-g2/development/tools-srk-tool-useful-toos-lg-root-twrp-t3079076)
  2. Unzip the SRKTool file
  3. Double click srktool21.exe (Watch the youtube link in reference from this point)
  4. Be careful when selecting disk number!
  5. Reboot afterwards, it should have been factory reset + partition cleaned, so the phone will connect normally to PC.

Reference:

https://www.youtube.com/watch?v=ERZvlJIC9dE

https://forum.xda-developers.com/lg-g2/development/tools-srk-tool-useful-toos-lg-root-twrp-t3079076

Upgrading to Android Nougat 7.1.1

  1. Install LG One-Click Root Program
  2. Download AutoRec apk file, bootloader, MOKEE ROM and Lambda kernel (of appropriate phone model). No need to unzip them.
  3. Connect phone to PC, move all those files into /Downloads folder (any folder is ok as well).
  1. Open LG One-Click Root Program
  2. Plug in phone to PC, make sure USB debugging is on and click OK if the phone asks for permission to share keys etc.
  3. The phone will reboot at around 45%, make sure the phone USB debugging allows the PC to connect. The phone will reboot again at 90%.
  4. If it’s stuck at 90% while the phone screen shows firmware update (펌웨어 업데이트), wait for about 3–5 minutes then unplug. If it’s unplugged too early there may be a chance of bricking the phone.

If the phone gets bricked in any stage of rooting or upgrading process, follow the “Bricked?” section of General Tips section.

  1. Go to File Manager / File explorer (download any file exploration app from Google Apps if there isn’t default one) and find AutoRec apk in /Downloads.
  2. Adjust security settings to allow for installation from 3rd parties .
  1. The phone will boot into recovery mode and start TWRP.
  2. Install bootloader. Install > Load bootloader zip file (something like F320L_KK_bootloader_plus_LP_bootstack.zip) > Swipe to flash. *Don’t check “check for md5” or other security settings*
  3. Fullwipe ▶ Wipe — Advanced Wipe — Dalvik cache, System, Data, Cache
  1. Install MOKEE ROM. Install > Load MOKEE ROM zip file > Swipe to flash. *Don’t check “check for md5” or other security settings*
  2. Install Lambda Kernel. Install > Load Lambda Kernel zip file > Swipe to flash. *Don’t check “check for md5” or other security settings*.
  3. Turn on the phone….wait for about 5–7 minutes. It will show MOKEE logo, then seemingly reboot into LG logo, then MOKEE logo with 3 loading dots. It takes long on this loading screen.
  4. Fill in initial settings for the phone.

Reference (translated from Korean article) http://blog.naver.com/hoegyung/220950508728

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r&d blog on architecture, software engineering and inspirations

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