[Non F500]Downgrade nougat back to MM

fegitoli

fegitoli

Senior Member
Jul 25, 2017
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Toronto
Aug 30, 2017 at 7:03 PM
@da.vandenham
So what happens if I flash your KDZ, then the KDZ for my device, and the modem doesn't work? Will I be stuck without a functional modem until I get my phone repaired?
As mentioned previously, my variant is the H812, which has no way of getting a custom recovery or root.
 
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da.vandenham

Senior Member
Aug 12, 2016
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Aug 30, 2017 at 8:58 PM
fegitoli said:
@da.vandenham
So what happens if I flash your KDZ, then the KDZ for my device, and the modem doesn't work? Will I be stuck without a functional modem until I get my phone repaired?
As mentioned previously, my variant is the H812, which has no way of getting a custom recovery or root.
Click to expand...
LGUP flashes the modem so it cannot be a flashing error. Possibly a hardware fault. I guess repair is the only way but I am not sure.
 
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fegitoli

fegitoli

Senior Member
Jul 25, 2017
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Toronto
Sep 4, 2017 at 12:47 AM
@da.vandenham Please PM me!
I flashed your KDZ but when I flash stock for my device it says that the KDZ is invalid.
Attempting to boot into the firmware is just a black screen. No bootlogo, nothing.
It appears to boot into the setup screen but the screen is still black. I know it is on because I can still adjust the volume.
EDIT: I attempted to replace 'H812' with 'H815' in a hex editor and the KDZ is still invalid.
I am not putting the blame on you, I would just like your help.
 
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znobox

Member
Feb 27, 2008
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Lille
Sep 6, 2017 at 10:42 AM
Hi,
I also have the modem bug when downgrade my H815T to MM.

I fixed it after using "Network Signal Guru" found playstore.

open -> go to menu ->
1) Lock band-> GSM / WCDMA / LTE "Edit/Choice/Lock band by your operator "
2) Lock RAT -> AUTO
reboot

^^
 
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OrKaMen

Member
Jun 1, 2017
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Sep 18, 2017 at 4:09 PM
I tryed to Flash the modded file over my f500k30c but it stops at 9% with error 0x2000 flashing fail .
I tryed to edit the H815 to F500K but it shows the error at 4% kdz file is invaild. I cant use sim cards in germany.
I had no root , no Recovery and an korean bootloader.

Sorr for my bad english
 
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da.vandenham

Senior Member
Aug 12, 2016
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Sep 19, 2017 at 10:32 AM
OrKaMen said:
I tryed to Flash the modded file over my f500k30c but it stops at 9% with error 0x2000 flashing fail .
I tryed to edit the H815 to F500K but it shows the error at 4% kdz file is invaild. I cant use sim cards in germany.
I had no root , no Recovery and an korean bootloader.

Sorr for my bad english
Click to expand...
Try replacing your LGUP dll with this one:
https://mega.nz/#!b51GGDLL!n42yqpAIaEbgbx8WkoB8DtDAERx3N8tsHhPkC_XDs5M

It's located in this directory:
C:\Program Files (x86)\LG Electronics\LGUP\model\8994
Or this one if you have a 32-bit windows pc:
C:\Program Files\LG Electronics\LGUP\model\8994

And then flash my KDZ again
 
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otaviohpf

Member
Sep 27, 2017
9
0
0
Oct 3, 2017 at 11:53 AM
znobox said:
Hi,
I also have the modem bug when downgrade my H815T to MM.

I fixed it after using "Network Signal Guru" found playstore.

open -> go to menu ->
1) Lock band-> GSM / WCDMA / LTE "Edit/Choice/Lock band by your operator "
2) Lock RAT -> AUTO
reboot

^^
Click to expand...
Hi, for this method i need root ? I had the same problem when I downgrade my 818P.
For now my g4 is just a paperweight
 
S

sar71

New member
Jan 7, 2017
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Oct 8, 2017 at 10:49 PM
Good evening.

I have an H815 with v29a Nougat. When I try to flash your modified KDZ with LGUP it gets to 4 % and then says "KDZ invalid".
I have changed the LGUP_8994.dll as recommended in a previous post but it still won't work.

I would be grateful for any further suggestions. Many thanks.
 
F

[email protected]

New member
Oct 8, 2017
1
0
0
Oct 8, 2017 at 11:07 PM
sar71 said:
Good evening.

I have an H815 with v29a Nougat. When I try to flash your modified KDZ with LGUP it gets to 4 % and then says "KDZ invalid".
I have changed the LGUP_8994.dll as recommended in a previous post but it still won't work.

I would be grateful for any further suggestions. Many thanks.
Click to expand...
the same at me.....
 
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otaviohpf

Member
Sep 27, 2017
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0
Oct 8, 2017 at 11:29 PM
da.vandenham said:
I have extracted this modem frm the firmware you described: https://mega.nz/#!L8VwQRJY!ESrUJlFyM_kRTNEZQaUqBiLcecQ1NgBvsbBjDz77EyU

The easiest way to flash it manually is (you need root for it):
Copy the modem IMG-file to your internal storage (don't rename it!)
Open up an ADB command line on your computer
Execute the "adb shell" command (without quotes)
Elevate the shell using the "su" command (again, no quotes)
And then run these commands:
dd if=/dev/zero of=/dev/block/platform/bootdevice/by-name/modem
dd if=/sdcard/modem_h818p_20h_gcc.img of=/dev/block/platform/bootdevice/by-name/modem
Lastly, reboot you phone and it should work.
Click to expand...
Hi dare, do you can extract modem for H818P10d ? I dont know how can I do it. Thanks
 
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da.vandenham

Senior Member
Aug 12, 2016
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Oct 9, 2017 at 4:54 AM
sar71 said:
Good evening.

I have an H815 with v29a Nougat. When I try to flash your modified KDZ with LGUP it gets to 4 % and then says "KDZ invalid".
I have changed the LGUP_8994.dll as recommended in a previous post but it still won't work.

I would be grateful for any further suggestions. Many thanks.
Click to expand...
[email protected] said:
the same at me.....
Click to expand...
This method only works for the modded Korean firmwares. Downgrading v29a can be done by flashing almost every H815 kdz in LGUP. (Only for h815 models of course)
 
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SiSoyYoFacu

Member
Nov 16, 2015
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3
0
Oct 13, 2017 at 6:37 PM
i do really need help

Let me tell everything. I unlocked the Bootloader, and flash twrp. i tried few ROMs and, finally flash v29a. The big problem is that now i'm trying to get twrp again so i can another ROM (freedom or imperium) again.The really big problem is that i cant get DEBUG mode to work. It's like mi pc don't recognize my phone, or something like that. The further i was able to get it's that LG UP and LG Bridge recognize my phone, but neither of them seems to be really communicating with the phone. The only thing I want is to get ADB so I'll be able to flash TWRP trougth ADB.
HEEELP

PS: When my PC "recognize" my phone is when the debug mode it's turned off, as soon as I turn on again it dont recognize it anymore

PS2: I also tried fastboot mode, with no success
 
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