Develop Bugs

Install t-mobile rom onto h812 possible?

I have a lg g4 h812 and its unlock and on T-mobile now. Since it looks like the h811 and h812 have same hardware could I flash h811 firmware onto my h812?

you could always try to flash the first revision of the 811 firmware that is below 10H, i've tried on mine and got me into HardBrick. Got repaired for free.

xavierlangevin1 said:
you could always try to flash the first revision of the 811 firmware that is below 10H, i've tried on mine and got me into HardBrick. Got repaired for free.
Click to expand...
Click to collapse
What version did you flash that caused the hardbrick?

From my understanding you should never cross flash models. Some g4 varients could be differ. But rule of thumb never do it unless confirmed to work

I've successfully flash a 815 & 818 into my 812, but we have to reflash the modem file of the 812 original firmware to be able to obtain network (wifi work but quite laggy).
The 81110H is the firmware that i've tried to install (Phone wont reboot after upgrade and show off like 9008 device) . i don't know if we could modify a kdz for being able to inject directly the modem of the 812 into 815 rom...

Yes you can
I've made this tutorial but you have to change some thinks to use in your variant
PS: you will get some problems with your modem (dont work)
If you found how to get working
Please share
http://forum.xda-developers.com/att-g4/general/how-to-install-cyanogenmod-h810-t3388019

Wjbr1993 said:
Yes you can
I've made this tutorial but you have to change some thinks to use in your variant
PS: you will get some problems with your modem (dont work)
If you found how to get working
Please share
http://forum.xda-developers.com/att-g4/general/how-to-install-cyanogenmod-h810-t3388019
Click to expand...
Click to collapse
Which variant your using ? i wanna test to install the system.img partition into anyother variant that cannot be officially unlocked and try it. *i've get access to g4 812 bootloader with flashing a 815 firmware but can't unlock it...

xavierlangevin1 said:
Which variant your using ? i wanna test to install the system.img partition into anyother variant that cannot be officially unlocked and try it. *i've get access to g4 812 bootloader with flashing a 815 firmware but can't unlock it...
Click to expand...
Click to collapse
Im using a H810 (AT&T) variant
I install a H811 kdz on it
It works perfect but i cant get signal
And yes i can unlock the bootloader with this kdz (H811)

So you tried it ? to unlock ?

Wjbr1993 said:
Yes you can
I've made this tutorial but you have to change some thinks to use in your variant
PS: you will get some problems with your modem (dont work)
If you found how to get working
Please share
http://forum.xda-developers.com/att-g4/general/how-to-install-cyanogenmod-h810-t3388019
Click to expand...
Click to collapse
Can someone could try this with a 815, or any other model than 810 ?
---------- Post added at 06:36 PM ---------- Previous post was at 06:08 PM ----------
iljalways said:
I have a lg g4 h812 and its unlock and on T-mobile now. Since it looks like the h811 and h812 have same hardware could I flash h811 firmware onto my h812?
Click to expand...
Click to collapse
You could try the method of this guy but i can't tell if you will get a hardbrick...

xavierlangevin1 said:
Can someone could try this with a 815, or any other model than 810 ?
---------- Post added at 06:36 PM ---------- Previous post was at 06:08 PM ----------
You could try the method of this guy but i can't tell if you will get a hardbrick...
Click to expand...
Click to collapse
Here it is
I based my tutorial in another one
http://forum.xda-developers.com/g4/general/lg-g4-f500l-restore-signal-flash-815-t3214574

i've seen it before but flashing the 811 kdz give me a hardbrick. If i flash 810 then 811 that could work but cannot try it right now.

xavierlangevin1 said:
i've seen it before but flashing the 811 kdz give me a hardbrick. If i flash 810 then 811 that could work but cannot try it right now.
Click to expand...
Click to collapse
DONT flash a 810 kdz
Just use some steps from my tutorial but using files for your variant

Wjbr1993 said:
DONT flash a 810 kdz
Just use some steps from my tutorial but using files for your variant
Click to expand...
Click to collapse
With the 812 we can't directly flash a 811, without causing a hardbrick. I was only wondering if i could flash a 810 successfully a 811 wont be a problem

xavierlangevin1 said:
With the 812 we can't directly flash a 811, without causing a hardbrick. I was only wondering if i could flash a 810 successfully a 811 wont be a problem
Click to expand...
Click to collapse
Aaah
Yes you can
But you have to flash first with lg flash tool 2014 (flash others kdz without problem)
And then with LG UP

xavierlangevin1 said:
I've successfully flash a 815 & 818 into my 812, but we have to reflash the modem file of the 812 original firmware to be able to obtain network (wifi work but quite laggy).
The 81110H is the firmware that i've tried to install (Phone wont reboot after upgrade and show off like 9008 device) . i don't know if we could modify a kdz for being able to inject directly the modem of the 812 into 815 rom...
Click to expand...
Click to collapse
Hello friend,
I am also thinking of flashing H815(international) rom onto my H812(Canadian) hardware. If you don't mind, could you please tell me how did the phone function with the H815 firmware?
Thank you very much. Your help is greatly appreciated.

BIG_BADASS said:
Hello friend,
I am also thinking of flashing H815(international) rom onto my H812(Canadian) hardware. If you don't mind, could you please tell me how did the phone function with the H815 firmware?
Thank you very much. Your help is greatly appreciated.
Click to expand...
Click to collapse
you cannot use it for daily usage, the mobile network doesn't work and the phone will randomly reboot sometimes.

xavierlangevin1 said:
you cannot use it for daily usage, the mobile network doesn't work and the phone will randomly reboot sometimes.
Click to expand...
Click to collapse
Ok thanks, I'm asking because I'm going on a long trip to UK and the Middle East for 6 or 7 months , and thought flashing the H815 firmware would make it compatible with those networks and therefore a free solution, rather than paying to have it unlocked.
Thanks

xavierlangevin1 said:
you cannot use it for daily usage, the mobile network doesn't work and the phone will randomly reboot sometimes.
Click to expand...
Click to collapse
So by default, H812 has a locked bootloader. But despite this, the flashing of H815 firmware still worked?

If you read carefully all posts in most of the cited "how-to's" ...
If you read carefully all posts in most of the cited "how-to's" that have been linked in the responses you've gotten to date ... you will note that many problems are encountered, ranging anywhere from hard bricks down. Simply not worth the risk, IMO as there is not a high enough probability that you can get back to what you had originally that was working in the first place.
S.

Unable to make VoLTE calls on international LG G4(H815)

Hi all.
I am using international variant of lg g4(the h815 version) on firware v20d-EUR-xx rooted with unlocked bootloader. Recently i started using relaince jio in india which uses 1800mhz i guess. So here's the problem. I am able to use the 4g data but unable to use volte feature. I looked for volte settings everywhere but they are nowhere to be found. On hidden menu when i reached the volte turn off/on feature it says not supported.
As far as i know international Lg g4 does have volte feature. So why is it not working in mine? What can i do to resolve it?
Any help would be great.

dbzgoku said:
Hi all.
I am using international variant of lg g4(the h815 version) on firware v20d-EUR-xx rooted with unlocked bootloader. Recently i started using relaince jio in india which uses 1800mhz i guess. So here's the problem. I am able to use the 4g data but unable to use volte feature. I looked for volte settings everywhere but they are nowhere to be found. On hidden menu when i reached the volte turn off/on feature it says not supported.
As far as i know international Lg g4 does have volte feature. So why is it not working in mine? What can i do to resolve it?
Any help would be great.
Click to expand...
Click to collapse
H815 international version doesn't support volte. But the good news is volte support can be enabled by flashing rom's.
Flash any LG kdz (For H815T or H815TR) using LG UP. One is here
Flashing instructions using LG UP can be found here
After flashing turn on volte from settings.

dinesh17m said:
H815 international version doesn't support volte. But the good news is volte support can be enabled by flashing rom's.
Flash any LG kdz (For H815T or H815TR) using LG UP. One is here
Flashing instructions using LG UP can be found here
After flashing turn on volte from settings.
Click to expand...
Click to collapse
thanks bro.
So i upgraded to latest v20h switzerland rom via lg up. But there is no change. The problem is still there.

dbzgoku said:
thanks bro.
So i upgraded to latest v20h switzerland rom via lg up. But there is no change. The problem is still there.
Click to expand...
Click to collapse
V20h doesn't have volte support. Please flash the one i have mentioned. Only TR/T version has volte support.

dinesh17m said:
V20h doesn't have volte support. Please flash the one i have mentioned. Only TR/T version has volte support.
Click to expand...
Click to collapse
ok so i downloaded the kdz from the thread. but when i try to flash it with the LG UP it gives me the following error-
error 0x2000: cant decide current device mode
yesterday when i flashed with v20h it went smoothly. but today it is not getting flashed at all.

dbzgoku said:
ok so i downloaded the kdz from the thread. but when i try to flash it with the LG UP it gives me the following error-
error 0x2000: cant decide current device mode
yesterday when i flashed with v20h it went smoothly. but today it is not getting flashed at all.
Click to expand...
Click to collapse
Tried booting it in fastboot and see if LG UP is able to flash rom.

dinesh17m said:
Tried booting it in fastboot and see if LG UP is able to flash rom.
Click to expand...
Click to collapse
booted into fastboot via adb. but LG UP doesn't recognise the phone while in fastboot.

USA H815, Help please

Hi! I bought a H815 version, foe a steal btw, "130$" Thinking that I could unlock the bootloader, but then doing more research only finding that the only way doing so is if I have a EU version.
So anyone know anyway I could trade or buy a EU or UK version for cheap so I could trade or it doesn't anyone know the status of the USA H815 bootloader status?
Also wtff why isn't the H815 version upgraded to marshmallow? This stock ROM is majorly broken .

tmobile one can be bootloader unlocked. h811.

I just did the same thing, got a h815 USA with locked bootloader.
Using LGUP I was able to flash version 20d MM and it is working fine.

You could try https://www.reddit.com/r/phoneswap/
I've got 20j MM running on my USA H815.
I updated with the .kdz file from here: http://forum.xda-developers.com/g4/general/kdz-firmware-v20j-united-kingdom-2016-t3518925
I used the installers and software from here: http://forum.xda-developers.com/g4/help/lgup-install-kdz-mm-lp-t3249803
Note that in the LGUP application, you need to click Update to select a .kdz file. You then need to exit and restart the program, then click refurbish to do a clean flash.

G4 shows wrong version

long time lurker here.I bought a g4 second hand.it was advertised as h815 unlocked.the imei checked out online and all stickers said 815 as well.but in hardware info it showed h815T(HK variant).thankfully i knew how to flash firmwares so i downloaded a KDZ and flashed it with lg ft 2014.for some reason (i dont remember why) i flashed 2-3 times with other kdzs and ended up in the current state.the phone now shows H818(dual sim variant) in hardware info and doesnt
detect my sim card(same sim works fine in my G2).I never downloaded the h818 kdz.
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phone shows wrong model in settings and doesnt detect sim card.flashing stock kdz doesnt fix this
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any help would be appreciated as i have been flashing various KDZs since the last 2 months but have had no luck yet.
ps.
i am able to root using system.img injection method if root is required

nizamelahi said:
long time lurker here.I bought a g4 second hand.it was advertised as h815 unlocked.the imei checked out online and all stickers said 815 as well.but in hardware info it showed h815T(HK variant).thankfully i knew how to flash firmwares so i downloaded a KDZ and flashed it with lg ft 2014.for some reason (i dont remember why) i flashed 2-3 times with other kdzs and ended up in the current state.the phone now shows H818(dual sim variant) in hardware info and doesnt
detect my sim card(same sim works fine in my G2).I never downloaded the h818 kdz.
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||((TLDR))||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
phone shows wrong model in settings and doesnt detect sim card.flashing stock kdz doesnt fix this
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any help would be appreciated as i have been flashing various KDZs since the last 2 months but have had no luck yet.
ps.
i am able to root using system.img injection method if root is required
Click to expand...
Click to collapse
i think is was misinterpreted. its a h815 but a h815t indeed and unlocked mean carrier as you know theres no way to unlock bootloader.. you need to flash the h815T KDZ. i hope that you didnt mess your imei.
inject only works in LP not on MM. also youll need to find out if you can downgrade to lollipop. as this phone have antirollback wich means once you are on a version you cannot go nack or youll hard brick phone.

raptorddd said:
i think is was misinterpreted. its a h815 but a h815t indeed and unlocked mean carrier as you know theres no way to unlock bootloader.. you need to flash the h815T KDZ. i hope that you didnt mess your imei.
inject only works in LP not on MM. also youll need to find out if you can downgrade to lollipop. as this phone have antirollback wich means once you are on a version you cannot go nack or youll hard brick phone.
Click to expand...
Click to collapse
thank you for the response.im on lollipop right now since ft 2014 doesnt flash MM and lgup and ft 2.0.1.6 stop flashing after checking phone info(they stop flashing as phone shows h818 but kdz is for h815).I flashed h815T kdz multiple times(twice just today)but phone still shows h818 in lgup and in settings.the phone cant be h818 as it only has 1 sim slot.
imei is ok right now.SIM issue happened to be a ****ty sim cut job by the customer service guy.only remaining issue is the wrong version showing up in phone settings. cant flash MM due to that.
also,is there anything good about upgrading to MM???

nizamelahi said:
thank you for the response.im on lollipop right now since ft 2014 doesnt flash MM and lgup and ft 2.0.1.6 stop flashing after checking phone info(they stop flashing as phone shows h818 but kdz is for h815).I flashed h815T kdz multiple times(twice just today)but phone still shows h818 in lgup and in settings.the phone cant be h818 as it only has 1 sim slot.
imei is ok right now.SIM issue happened to be a ****ty sim cut job by the customer service guy.only remaining issue is the wrong version showing up in phone settings. cant flash MM due to that.
also,is there anything good about upgrading to MM???
Click to expand...
Click to collapse
Actually MM isnt an upgrade. Lollipop is best(maybe nougat will be worth anything). I think you should flash uk v20g kdz with lg up(or LG firware flash 2014). I suggest using LG UP also you can give TOT method a try
check this thread:
https://forum.xda-developers.com/g4/general/guide-lg-g4-stock-firmware-to-stock-kdz-t3107848
reply to me if you will need any help

Minto107 said:
Actually MM isnt an upgrade. Lollipop is best(maybe nougat will be worth anything). I think you should flash uk v20g kdz with lg up(or LG firware flash 2014). I suggest using LG UP also you can give TOT method a try
check this thread:
https://forum.xda-developers.com/g4/general/guide-lg-g4-stock-firmware-to-stock-kdz-t3107848
reply to me if you will need any help
Click to expand...
Click to collapse
cant flash tot as lgup and ft 2.0.1.6 check phone version....
no MM for me then...lets just wait for nougat
the only issue left now is no network reception

nizamelahi said:
cant flash tot as lgup and ft 2.0.1.6 check phone version....
no MM for me then...lets just wait for nougat
the only issue left now is no network reception
Click to expand...
Click to collapse
Do they check in build.prop? If so just change build.prop value and you're good to go. I think that there is also possibility to fake your software version and then flash anything you want
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Help required H815T10H

Since my H815T is stuck and i am getting "antirollback version is smaller than tot" even on 815T10H open Australia
Meaning that i have to go for official kdz and my imei confirms that it is an OPTUS Australia phone.
Therefore i need a offical OPTUS Australia firmware.
http://devtester.ro/projects/lg-firmwares/country.php?country=Australia#
have official firmware but when i click download nothing just blank page leading me to
http://pkg03.lime.gdms.lge.com/dn/downloader.dev?fileKey=FW8FBVV1329FAYXCC5FD3M7/H815T10h_00.kdz
Please suggest how to make it work or where could i get official Optus firmware H815T10H.
Thanks in advance.

Are you sure you have a H815?? There shouldn't for any antirollback for the H815T
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well... another case to the list.
You must open your G4 and see in the motherboard what model it is. Probably you have a refurbish G4 (maybe LS991 model).

the_naxhoo said:
well... another case to the list.
You must open your G4 and see in the motherboard what model it is. Probably you have a refurbish G4 (maybe LS991 model).
Click to expand...
Click to collapse
Alright opened my mobile and it have EAZ66585501_H810_MAIN_1.0 written on it. What does it mean?
And thanks to you guys and your prompt reply that we still have hope for our devices.

fawadshah33 said:
Alright opened my mobile and it have EAZ66585501_H810_MAIN_1.0 written on it. What does it mean?
And thanks to you guys and your prompt reply that we still have hope for our devices.
Click to expand...
Click to collapse
That means you have an H810 and not an H815
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hyelton said:
That means you have an H810 and not an H815
Click to expand...
Click to collapse
Thanks for the tip. Now how can i flash H810 firmware. LGUP gives error "invalid tot" when H810 tot is flashed.

fawadshah33 said:
Thanks for the tip. Now how can i flash H810 firmware. LGUP gives error "invalid tot" when H810 tot is flashed.
Click to expand...
Click to collapse
Sorry I can't help with that. That's not simple if it's possible especially if your getting antirollback problems.
I'd suggest returning the phone since it's been tampered with
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