[GUIDE LG G2 D802] - How to fix force close when downgrade firmware without data on sdcard lost

I'm not responsible for any damage what-so-ever done to your phone, you accept this risk.

 
Hi all,
I'm proud to present guide how to fix force close when downgrade firmware without data on sdcard lost.

In case , I have flashed OptimusG3 V1.4 that is a higher firmware than LG G2 D80220c then I want to return to stock with KDZ flashing method (Use D80220c firmware).

While G2 boot normally and prepare enter to system I got many error.In this case the one way you have to use TOT flashing method.Your data in SDCARD  will be lost.

I have a little guide to help you return back to stock without data on SDCARD lost.

Testing on D802 Work.... For D802 Only .. 
You can apply with other variant. 
Changing recovery.img and laf.bin

1. Download LG_Root_LP_20150313.zip
 This is a new ROOT method from
http://forum.xda-developers.com/android/development/guide-root-method-lg-devices-t3049772
I got it from that link.I'm adding recovery.img that is a TWRP Recovery in to zip file.

2. Unzip LG_Root_LP_20150313.zip

3. Put G2 in Download Mode

 

4. Open command DOS in  LG_Root_LP_20150313 (Click Command Prompt.bat )

 

5. Checking what is port that connect between G2 and Computer  (Run ports.bat)

6. Use command > Send_Command.exe \\.\COM41

COM41 is a port that connecting between G2 and Computer which find from 5.

This Method is RISK!!.It will be destroy your DOWNLOAD MODE.
Please consider before use the next command...

7. Use command
dd if=/dev/zero of=/dev/block/platform/msm_sdcc.1/by-name/laf
FOR destroy DOWNLOAD MODE

8. Use command
LEAVE
For exit. then G2 will be reboot

9. Tring Enter DOWNLOAD MODE again .The Phone will be enter fastboot mode instead.

 

10. Don't worry. In command prompt.Use Command

fastboot.exe boot recovery.img

For Reboot to TWRP Recovery

11. In TWRP .Choose Wipe > Advanced Wipe > Check

- Dalvik Cache
- System
- Data
- Cache

Then Swipe to Wipe

 

12. In TWRP Choose Home Button then Choose Reboot > Power Off

13. Tring Enter DOWNLOAD MODE again .The Phone will be enter fastboot mode instead.
Use Command
fastboot.exe flash laf laf.bin
For fix DOWNLOAD MODE

14. Use Command
fastboot.exe reboot
For exit fastboot mode

15. After that Trying Enter to DOWNLOAD MODE .You can Flash KDZ firmware normally.
ENJOY......