US998 to LS998 *Sprint LTE + Root*

[JWnSC]

If you mess up your device I'm not responsible, it works for me, and for others. I will help as much as i can, but it is on YOU, the user to follow the prerequisites and read carefully. This zip was created in collaboration with @TxanMoe and myself

This zip can be used to return to the stock rom(for the most part, you'll still have fastboot,root,twrp) as long as you can get into TWRP recovery on the device. It also flashes the modem bands needed for working Sprint LTE(bands 25,26,41, ect.."all the Sprint bands")

Prerequisites:

1. Activate with Sprint first if you intend to use the converted US998 on Sprint!

2. You already crossflashed to US998 if not follow the guide here "Frankenstein method" [https://forum.xda-developers.com/lg...sflashing-t3780969/post76510671#post76510671]

3. You followed the bootloader unlock, root, TWRP "WTF" thread here https://forum.xda-developers.com/lg-v30/how-to/wtf-lg-v30-t3790500



(US998 to LS998) Downloads: (Sprint LS998 system,boot,modem)* MAKE SURE TO FLASH MAGISK, NO-VERITY OPT ENCRYPT, AND RCD DISABLER BEFORE LEAVING RECOVERY!!*

Sprint 20b
https://drive.google.com/file/d/1aQojUcchnEruHwnecfaVGToxZbmj-UX3/view?usp=drivesdk

Sprint 21a(may security patch)
https://drive.google.com/file/d/1JCalyu7mt8DW6wMWbgGViqj0oi9eUSr7/view?usp=drivesdk


*Instructions*:

a. Make a backup in TWRP of system,boot,and data before proceeding!

b. Reboot to TWRP and wipe data (factory data reset)

c. Install the SPRINTLS998.zip (20b or 21a)from TWRP (Do NOT leave recovery yet)

d. Flash Magisk, no verity encrypt, and RCD disabler(you should already have these files if you followed the WTF thread)

e. Reboot

d. Once booted up you need to connect to WiFi. go to settings, update profile and prl. Reboot

For anyone who flashes back to Sprint but needs to edit the APNs still, you can type this in command prompt(from PC)

adb shell
su
am start -n com.lge.hiddenmenu/com.lge.hiddenmenu.ModemProtocol.ModemProtocolMain

Then go to PDP Setting
Then go to APN setting

be sure to thank his post here
https://forum.xda-developers.com/showpost.php?p=76633700&postcount=45

@JWnSC thanks to the help of some of you great people in this thread I have had the chance to do this conversion twice now. Both times it worked great but I did have to update the APN settings before getting mobile data to work for me. I know you were kind enough to include screenshots of the right APN settings but I just wanted to share that both times I used the ##SCRTN## dialer code to force OTA provisioning and it worked, so I thought you may want to add that option to your first post. Might be a good option for someone that's in hurry to get connected.

Only negative I can think of is that you would not have tethering unless you were subscribed or you manually added the "Dun" provision to the APN later.


Just wanted to share in case you thought it was worth adding to your original post. If not, no biggie. Thanks

Special thanks:
@TxanMoe for finding the bootloader exploit and helping me along the way
@ChazzMatt for his in depth Guides and help in this forum
@SGCMarkus for TWRP recovery for this device and all the roms he provides
@quantemplation
@JonnyTrulove
and to any others I may have missed..

 

[JWnSC]

Here is a zip for warranty exchange ect...*NOT Recommended* (you will lose root, TWRP)

https://drive.google.com/file/d/19FHVNn6TS5ybdNIziL1nyKPWcIc_RN0t/view?usp=drivesdk

From TWRP(wipe data) install the FACTORYSPRINT.zip reboot device, update prl and profile, reboot, do a system update
It works. I tested it

 

[SilverZero]

I'll give this a real-world run-through tomorrow when my new LS998 arrives.

 

[JWnSC]

I'll give this a real-world run-through tomorrow when my new LS998 arrives.

I tested it myself to make sure it works. Working on creating a full back to stock zip for warranty exchange ect.. Will post that after I test and know all is well.

 

[jamesd1085]

I tested it myself to make sure it works. Working on creating a full back to stock zip for warranty exchange ect.. Will post that after I test and know all is well.

Yeah...it sucks we need this...sprint not allowing access to kdz is a load of bs...it is much appreciated that we have you helping to support us sprint users...i am looking back at my past lg phones now to see if i can find the process of creating a working kdz...one of the people i think in the g2 or g3 forums actually created a kdz using the untouched signed lg files and it was fully flashable to get back to 100% stock...i don't know if too much has changed since then to do this again...but it would be nice to have for some...me...i won't be doing anything that removes my bootloader unlock and root...but those with warranty may want to have that ability...thanks to all that have contributed to making this a great device...i missed root on a level people outside these forums may never understand

 

[cre4per]

Could you tell me if i could switch out your LS998 bins for h933 ones? also on my dump from lgup can i just change _com6 to .bin ?

 

[JWnSC]

Could you tell me if i could switch out your LS998 bins for h933 ones? also on my dump from lgup can i just change _com6 to .bin ?

Right. change "_COM#" to ".bin" should be fine as long as the rsa keys match for the devices you are flashing. Don't flash nougat to Oreo or vice versa

 

[cre4per]

Right. change "_ whatever com #" to ".bin" should be fine as long as the rsa keys match for the devices you are flashing. Don't flash nougat to Oreo or vice versa

perfect will give it a try, hoping this will let me get volte back on mydevice

 

[guapinoy]

Here is a zip for warranty exchange ect...*NOT Recommended* (you will lose root, TWRP)

https://drive.google.com/file/d/19FHVNn6TS5ybdNIziL1nyKPWcIc_RN0t/view?usp=drivesdk

From TWRP install the FACTORYSPRINT.zip reboot device, update prl and profile, reboot, do a system update
It works. I tested it

Could you lock the bootloader after this? Or will it show an error?

 

[JWnSC]

Could you lock the bootloader after this? Or will it show an error?

Bootloader would still be unlocked but the message after every boot would disappear and you won't be able to enter fastboot. (After you do the system update)

I thought after installing the latest update it would lock the bootloader...it didn't, but it did remove the text after every boot saying to lock bootloader and you won't be able to enter fastboot after. Activating developer options will show the boot is still unlocked. It does change the software info to LS99821a instead of US99820a

To lock the bootloader, you could probably flash the other Sprint zip(without flashing magisk ect..) and just sprint recovery or the factory zip. Reboot to bootloader from twrp and lock it that way. Then do the Sprint system update *I have to do more testing tho I don't recommend doing this until it's tested*

 

[Omatter4]

I have followed WTF thread for my Spring LS998. I have also flashed the modem.bin. I have working LTE on US99820a. I went to try and update PRL and Profile but clicking the buttons does nothing at all. Is this common? Also, i noticed that text messaging are received intermittently. They come in, in bunches, but only immediately after I send out a text. has this happened to anyone else?

I'm assuming if i flash the SPRINTLS998.zip, it will correct this issue, but I don't want to if there is no need and there is a fix. I want to try out DotOS, but don't want to carry my texting and MMS issues over from my current U99820a setup.

 

[JWnSC]

I have followed WTF thread for my Spring LS998. I have also flashed the modem.bin. I have working LTE on US99820a. I went to try and update PRL and Profile but clicking the buttons does nothing at all. Is this common? Also, i noticed that text messaging are received intermittently. They come in, in bunches, but only immediately after I send out a text. has this happened to anyone else?

I'm assuming if i flash the SPRINTLS998.zip, it will correct this issue, but I don't want to if there is no need and there is a fix. I want to try out DotOS, but don't want to carry my texting and MMS issues over from my current U99820a setup.

You can't update profile/ prl on US998 firmware(or at least I couldn't). Backup your setup and try DotOS if you already have working lte. This thread is mainly for users to get lte back. I'm not running the stock Sprint firmware. I switched to stock firmware first to get lte working and switched back to us998 rom.

If you wipe data and flash the SprintLS998.zip you won't have any issues. It already contains the Sprint modem, system, and boot. No need to flash the modem from the other thread.

 

[Lurien]

Will flashing the sprint zip only have bands 25,26 &41?? I'm in an area with band 13 also.. Thanks.

 

[ChazzMatt]

Will flashing the sprint zip only have bands 25,26 &41?? I'm in an area with band 13 also.. Thanks.

???

If you flash the Sprint modem you'll have all the Sprint bands.

It's just the US998 does not have LTE bands 26 & 41. So you have to flash the Sprint modem to get them. If the LS998 normally has LTE band 13, then you'll have that.

 

[jamesd1085]

Have any of our few sprint users taken latest update and tried to bootloader unlock and root their devices?...just wondering if they actually managed to patch it yet...

 

[JWnSC]

Have any of our few sprint users taken latest update and tried to bootloader unlock and root their devices?...just wondering if they actually managed to patch it yet...

I tested the latest update, it installed. I dumped the modem, system and boot from it. I can make a zip from it later. My bootloader was still unlocked tho. I plan to lock it and test..been putting it off, don't want to get stuck on stock haha. I need my phone this week. I'll test this weekend. After the latest update it removed the bootloader warning and I couldn't enter fastboot but the bootloader still showed unlocked under developer options.

 

[jamesd1085]

I tested the latest update, it installed. I dumped the modem, system and boot from it. I can make a zip from it later. My bootloader was still unlocked tho. I plan to lock it and test..been putting it off, don't want to get stuck on stock haha. I need my phone this week. I'll test this weekend. After the latest update it removed the bootloader warning and I couldn't enter fastboot but the bootloader still showed unlocked under developer options.

How did you install? Because twrp is there it failed on mine

 

[JWnSC]

How did you install? Because twrp is there it failed on mine

I flashed the factory back to stock.zip and went to settings, system update.

Not worth it imo...I was testing the factorysprint.zip to make sure it worked. I can make a flashable zip later(to only include system, modem,boot)..I don't think much changed. Looks like it was just an update to disable fastboot and access to recovery

 

[SilverZero]

I have followed WTF thread for my Spring LS998. I have also flashed the modem.bin. I have working LTE on US99820a. I went to try and update PRL and Profile but clicking the buttons does nothing at all. Is this common? Also, i noticed that text messaging are received intermittently. They come in, in bunches, but only immediately after I send out a text. has this happened to anyone else?

I'm assuming if i flash the SPRINTLS998.zip, it will correct this issue, but I don't want to if there is no need and there is a fix. I want to try out DotOS, but don't want to carry my texting and MMS issues over from my current U99820a setup.

The first time I tried the profile and PRL updates they took a while to actually launch. Not sure if yours would if you just waited a bit longer (like a minute). I would try that and then the Sprint zip (that's actually more likely to fix your issue).

 

[jamesd1085]

The first time I tried the profile and PRL updates they took a while to actually launch. Not sure if yours would if you just waited a bit longer (like a minute). I would try that and then the Sprint zip (that's actually more likely to fix your issue).

I had to connect to wifi when i updated profile...it kept telling me to contact carrier when i tried to update through data connection