[GUIDE] [NO ROOT REQUIRED] [EPIC UPDATE] How to add VoLTE support for other carriers to the G8 (and other Qualcomm powered LG devices too!)

[Cryomichel]

Field test menu is unavailable in korean models, no matter which android version.

So it's a no go then... I have rally big phone isseus, some calls are not even coming to the phone....

Root is not needed to cross flash LG ROM. It's needed for custom ROMs.
I have cross flashed my V50 and I'm not getting updates with OTA. It tells me the phone is up to date.

IF an update should appaear I could use the same method to apply it if I understand ?

Quad DAC works if you flash original LG software.

Even if you flash from another region ? I thought the DAC was specific to the Korean one

I wouldn't try to flash a ROM from another model. You'd better try to cross flash some US version if there is no european ROM for G8.

I understand, but the US ROMs are all carrier-specific and would not be compatible with the French networks no ?
Also, do you know if camera perfs woudl suffer from the update.

 

[C D]

Thanks ! Some questions
Was this menu available in Android 11 on korean phones ?
Do you know if I need to root the pone to do so ? Is there a BIG chance to brick the phone ?
Will I keep getting updates if one pops up (very low probability) ?
Will I keep the Quad DAC feature if I change the firmware ?
Do you know if I could directly put an european firmware ? In Europe it's another phone, the G8S not the G8...

Like the other commenter already said, you shouldn't try installing firmware from a different phone as it's not compatible and could even brick your phone if LGUP even allows the flashing process to go.

I think you have 2 options to try to get VoLTE to work for your Korean G8 in Europe:

1: Cross-flash with the USA Open G8 firmware (cross-flashing guide here) and then use this thread's guide to extract and load the modem profiles from any European/Global KDZ firmware file from a G8S, G8X, or V50 since there is no European G8. Read the cross-flashing guide carefully and be sure to back up all the important partitions before proceeding.

2: Root your phone, extract the "op" partition from any European/Global KDZ firmware file from a G8S, G8X, or V50, and then manually copy some telephony files from it (mainly cust.prop and config folder) to /product/op (that's a system folder which is why the phone needs to be rooted) with file permissions set to 644 (owner can read/write, group/others can read only). I have done this for my Sprint V50 to enable VoLTE for other U.S. carriers by taking the files from a USA Open G8 firmware file before a proper cross-flashing guide existed.

Assuming that the USA G8 firmware is compatible with your Korean model, option 1 should be easier for you since you don't have to deal with the rooting process. The only thing I'm not sure of is the fact that the Korean G8 has that 3rd telephoto camera that all other G8 models don't have. But all G8 phones have the Hi-Fi quad DAC. As always, read around carefully before attempting any of this.

 

[brainhac]

Field test menu is unavailable in korean models, no matter which android version.
Root is not needed to cross flash LG ROM. It's needed for custom ROMs.
I have cross flashed my V50 and I'm not getting updates with OTA. It tells me the phone is up to date.
Quad DAC works if you flash original LG software.
I wouldn't try to flash a ROM from another model. You'd better try to cross flash some US version if there is no european ROM for G8.

Thanks ! Some questions
Was this menu available in Android 11 on korean phones ?
Do you know if I need to root the pone to do so ? Is there a BIG chance to brick the phone ?
Will I keep getting updates if one pops up (very low probability) ?
Will I keep the Quad DAC feature if I change the firmware ?
Do you know if I could directly put an european firmware ? In Europe it's another phone, the G8S not the G8...

In US version you will get Field Test menu I have G8x and i can access it

 

[Cryomichel]

Like the other commenter already said, you shouldn't try installing firmware from a different phone as it's not compatible and could even brick your phone if LGUP even allows the flashing process to go.

I think you have 2 options to try to get VoLTE to work for your Korean G8 in Europe:

1: Cross-flash with the USA Open G8 firmware (cross-flashing guide here) and then use this thread's guide to extract and load the modem profiles from any European/Global KDZ firmware file from a G8S, G8X, or V50 since there is no European G8. Read the cross-flashing guide carefully and be sure to back up all the important partitions before proceeding.

2: Root your phone, extract the "op" partition from any European/Global KDZ firmware file from a G8S, G8X, or V50, and then manually copy some telephony files from it (mainly cust.prop and config folder) to /product/op (that's a system folder which is why the phone needs to be rooted) with file permissions set to 644 (owner can read/write, group/others can read only). I have done this for my Sprint V50 to enable VoLTE for other U.S. carriers by taking the files from a USA Open G8 firmware file before a proper cross-flashing guide existed.

Assuming that the USA G8 firmware is compatible with your Korean model, option 1 should be easier for you since you don't have to deal with the rooting process. The only thing I'm not sure of is the fact that the Korean G8 has that 3rd telephoto camera that all other G8 models don't have. But all G8 phones have the Hi-Fi quad DAC. As always, read around carefully before attempting any of this.

Thanks a lot !

I contacted my carrier, we will see of they can remotely fix some stuff. The huy in the store told me they will probably send me a new SIM Card after calling me.

If nothing works, I will try option 1 after getting some feedback from people owing a Korean one.

Did you tried crossflashing yourself ? Are there some bloatwares or differences from the Korean software ? Will I be able to use LG Backup tool ?

 

[Cryomichel]

In US version you will get Field Test menu I have G8x and i can access it

So you mean you crossflashed a European G8X with a US firmware ?

 

[brainhac]

So you mean you crossflashed a European G8X with a US firmware ?

Nop I have US version only and trying to crossflash to indian

 

[C D]

Thanks a lot !

I contacted my carrier, we will see of they can remotely fix some stuff. The huy in the store told me they will probably send me a new SIM Card after calling me.

If nothing works, I will try option 1 after getting some feedback from people owing a Korean one.

Did you tried crossflashing yourself ? Are there some bloatwares or differences from the Korean software ? Will I be able to use LG Backup tool ?

This all likely has to do with how your phone's telephony system files are configured, so I'm not sure if a carrier can do anything about that on their end.

I haven't tried this cross-flashing procedure yet, but coincidentally, at some point I will because I recently grabbed a barely-used (0 full battery charge cycles) USA G8 (BPT region) for cheap, and it needs to be switched to the USA Open firmware to get VoLTE on U.S. carriers (the procedure in this thread's guide can be done, but still couldn't get VoLTE to go on this particular G8 model). The firmware only has some LG and Google apps but no carrier bloatware.
Not sure if the LG Backup tool can restore backed up data on a different firmware version of the phone. I guess you'll have to try to find out.

 

[Cryomichel]

trying to crossflash to indian

"Trying" what did you achieved for now ?

 

[Cryomichel]

This all likely has to do with how your phone's telephony system files are configured, so I'm not sure if a carrier can do anything about that on their end.

I haven't tried this cross-flashing procedure yet, but coincidentally, at some point I will because I recently grabbed a barely-used (0 full battery charge cycles) USA G8 (BPT region) for cheap, and it needs to be switched to the USA Open firmware to get VoLTE on U.S. carriers (the procedure in this thread's guide can be done, but still couldn't get VoLTE to go on this particular G8 model). The firmware only has some LG and Google apps but no carrier bloatware.
Not sure if the LG Backup tool can restore backed up data on a different firmware version of the phone. I guess you'll have to try to find out.

Thanks a lot. please keep me updated on your trials.
I will see if I get time to crossflaH. I better keep a good confition phone with bad calls (only few people use phone nowadays) rather than a crossflashed, surely bugged (different hardware) and not even sure if it will work croshflashed phone....

 

[brainhac]

"Trying" what did you achieved for now ?

yesterday night i did from US to Indian stock rom and it's working fine.
Network thing i can not conform bcoz mobile network is gone
while enabling volte from hinned menu after restart
Mobile Radio Power is off. I can turn it on but after few sec it automatic goes off.
not able to change network band it say failed.

 

[brainhac]

The Indian G8S doesn't contain any India-specific MBNs either, like you said, they are the Korean or NA versions only.
To get VoLTE to work on the G8 in india you need root to edit some of the files in the OP and OP/config folders, loading MBNs will not help. I have VoLTE & VoWiFi working perfectly on Jio and Airtel and VoLTE on Vodafone.

Can you please share wht to add and where to add ?
I have G8 and it's not showing network. what to try your method.

 

[Premdrums]

You need the MBN's for your V20, MBN's from other devices will not load. Either dump your modem_a or modem_b partition using QFIL, or extract the partitions from a H990DS KDZ file.

You can also try this:
1. Create a new folder on your internal storage called enable_ue
2. Dial "#546368#*phone model" ex: *#546368#*990 for your V20
3. Go into field test==>universal enabler, then click "Create New Config"
4. Then enable the 4 boxes
5. See if VoLTE is working

Can't see this option in Verizon V60 version. Used the hidden menu code ##7764726600 and accessed field test. Screenshot attached. Can you please help in this regard?

 

[dzbarauskas]

Can't see this option in Verizon V60 version. Used the hidden menu code ##7764726600 and accessed field test. Screenshot attached. Can you please help in this regard?

same, no hidden menu, not a single hidden menu or unhidden menu code works on verizon v60

 

[noidodroid]

In case this hasn't been mentioned. Here is some more information from a site I get LG info on time to time. Here's a few helpful links!

星河官改ROM LG G8 30b 安卓11 卡刷包 VoLTE Root TWRP 本地化 精简 - yanhua-tj - 博客园

之前说了要做G8 官11精简卡刷包，国庆假期拖延了几天，哈哈 所以星河它来了，终于磨洋工做出来了(其实早就做出来线刷包，懒得写卡刷脚本) 所念皆星河 本卡刷包的特性： 精简谷歌套件保留Chrome浏览器和Play商店 默认中文语言zh-CN 加入通话归属地、联系人归属地、日期农历等本地化 解锁三网V

www.cnblogs.com

LG G8 40b 星河官改 安卓12 本地化 VoLTE Root 精简 Twrp - yanhua-tj - 博客园

简介 LG G8 官方Android12 精简系统卡刷包，终于来了，嘿嘿 ==注意：本系统包免费，若是付费获取均为上当受骗！！！== ==若有需要，可联系作者QQ有偿刷机，快捷、高效。== 所念皆星河 本官方系统定制修改卡刷包的特性： [x] 默认中文语言zh-CN [x] 精简谷歌套件但保留Chr

www.cnblogs.com