Delete This!

[Xsavi]

Delete This Please!

Go here instead: https://forum.xda-developers.com/lg-v40/how-to/guide-lgup-root-t3967858

 

[Michaeljror]

Can I Crossflash my LG V40 sprint to be used with an unlocked rom so it can be used in a different company with this method or just install android 9 but it will stay sim locked?

 

[twoxa]

Can I Crossflash my LG V40 sprint to be used with an unlocked rom so it can be used in a different company with this method or just install android 9 but it will stay sim locked?

No. Keep reading the forum.

 

[Xsavi]

If your device is sim locked by Sprint, the only way currently is to call Sprint and have them unlock it. No, this will not sim unlock your phone. I'm gonna put this in the OP.

 

[Heizi Blt]

Why not replace laf with the dd command?

 

[strk3r]

AFAIK V40 on android 9 can be flashed with lgup by default, without any LAF manipulations.
Only android 8 is problem, need to be flashed to 9 with octoplus

 

[Maxy52917]

Dump mode does not work.

 

[Droidman61]

Requirements:
Bootloader Unlocked V40 with V35 eng bootloader in slot B, or A if on Oreo
USB 2.0
Root (For wiping your LAF_a to access fastboot)
My laf Partition (Already Provided)
LGUP and Modded DLLs (Provided in attachment)​

Notes: When you're finished with this, you'll be able to use LGUP 1.14 with no issues. For some odd reason, my V40 has a laf protocol version of 08, instead of 16. So that means LGUP works. This works on all V40s with the exception of T-Mobile's V40.

Okay, lets's get started.

Download The FIles: Google Drive

Installing LGUP:​

1. Extract the zip file anywhere on your computer
2. Install LGUP and replace the files located in the "FilesToReplace" folder.
LGUP.exe goes in:

C:\Program Files (x86)\LG Electronics\LGUP

LGUP_common.dll goes in (If common folder isn't there, create it):

C:\Program Files (x86)\LG Electronics\LGUP\model\common

Flashing my LAF​

Okay, now, you'll need to be in the V35 engineering fastboot for this part.

1.Put your phone in fastboot mode (Power off, vol up, plug in). If you need to access fastboot mode (assuming you're rooted), dd /dev/zero your LAF_a partition (dd if=/dev/zero of=/dev/block/sde16). If on oreo, just power off and hold vol down.

2. Within the extracted ZIP, go into the LGUPCompatibleLAF folder and open a command prompt there (Type CMD in the address bar). We need to get into the V35 Engineering bootloader, run this command:

fastboot.exe set_active b

3. Reboot, and it should boot straight into the v35 eng for pie users. For oreo users, power off, hold vol down, plug in. Run these commands to flash my laf:

fastboot.exe flash laf_a laf.img

fastboot.exe flash laf_b laf.img

4. Now, we need to get back to our A slot, run:

fastboot.exe set_active a

5. Unplug and power off your device. Then, press and hold vol up and plug in your device. You should be in download mode and LGUP will work.

Some Advice:
Do NOT refurbish your device with LGUP. You WILL lose root and your unlocked bootloader. If you ever want to switch firmwares, just use Partition DL. If you use Partition DL, deselect: laf_a, laf_b, abl_b.
You may now flash the KDZ of your choice as long as it's compatible with your V40. Again, I highly recommend using Partition DL when flashing KDZs

Bootloader Unlocking
If you need your bootloader unlocked, or need to recover from a brick, head over to @vbenkovskyy on Telegram. He's an amazing dude and goes above and beyond when unlocking/flashing your device. His prices are amazing too and he'll work with ya (Be reasonable though). The reason I'm putting this in here is because he really helped me out on making these things possible (I bricked several times).

Again, head over to @vbenkovskyy on Telegram if you want your bootloader unlocked.​

This worked awesome, LGUP now works.:good:. Thank you. The only problem is not I can't get into FASTBOOT, only DOWNLOAD mode.

 

[imekul]

I followed this on my Sprint V40. After powering off and trying to enter download mode, I get "Your device has failed a routine safety check and will not boot."

Has anyone seen that before? After that, I get a green screen with black text that says "LGE Crash Handler : FIQ : NOC Error!"

Any ideas?

 

[Ainz_Ooal_Gown]

I followed this on my Sprint V40. After powering off and trying to enter download mode, I get "Your device has failed a routine safety check and will not boot."

Has anyone seen that before? After that, I get a green screen with black text that says "LGE Crash Handler : FIQ : NOC Error!"

Any ideas?

did the screen say Sahara?

 

[imekul]

Yeah, it said Sahara at the very bottom.

 

[Ainz_Ooal_Gown]

Yeah, it said Sahara at the very bottom.

I've gotten that a few times lol basically a few things aren't matching and it won't boot correctly, so therefore Sahara

 

[imekul]

Glad I'm not the only one!

Any idea how I can get out of it?

 

[Ainz_Ooal_Gown]

Glad I'm not the only one!

Any idea how I can get out of it?

You can try a few things
1st. fastboot mode and if it's v35 you can flash almost everything from Slot_b
2nd. try to enter download mode and see what happens if you enter Fastboot mode instead then you have the V40 Fastboot in that Slot.
3rd. wait for my Guide.

 

[imekul]

You can try a few things
1st. fastboot mode and if it's v35 you can flash almost everything from Slot_b
2nd. try to enter download mode and see what happens if you enter Fastboot mode instead then you have the V40 Fastboot in that Slot.
3rd. wait for my Guide.

For #1, do you mean use the fastboot.exe set_active b command and then try flashing with LG UP?

For #2, when I go to download mode it only stays at download for a few seconds before going to that screen with the green text and "Sahara" at the bottom. How do I enter fastboot from download mode?

I appreciate the suggestions!

 

[Ainz_Ooal_Gown]

For #1, do you mean use the fastboot.exe set_active b command and then try flashing with LG UP?

For #2, when I go to download mode it only stays at download for a few seconds before going to that screen with the green text and "Sahara" at the bottom. How do I enter fastboot from download mode?

I appreciate the suggestions!

If you have V35 Fastboot (Volume down and power when plugged in) then chances are you may have access to Download Mode, but V40 Fastboot Access so Pie actually boots up takes the place of download mode.

 

[imekul]

If you have V35 Fastboot (Volume down and power when plugged in) then chances are you may have access to Download Mode, but V40 Download Mode so that Pie actually boot up takes the place of download mode.

I do get the V35 fastboot when I do Vol Down + plug in cable. It says ACTIVE A/B Slot - _a.

Should I do the fastboot.exe set_active b command and then try rebooting into download mode and flashing from LG UP? I was a little confused what the next step would be if I could get the V40 into the V35 fastboot.

 

[thezachman]

I do get the V35 fastboot when I do Vol Down + plug in cable. It says ACTIVE A/B Slot - _a.

Should I do the fastboot.exe set_active b command and then try rebooting into download mode and flashing from LG UP? I was a little confused what the next step would be if I could get the V40 into the V35 fastboot.

Yes that's exactly what you should do. I have a Sprint V40 and was bootlooping to the V40 fastboot. I followed this post . I uninstalled and deleted all LGUP and ADB programs and files, from previous attempts just to get a clean start. The three links in the post have everything you need except for firmware. Download the US unlocked PIE kdz. A link to the file can be found in the footer/signature of the OP. You're intuition is on point though, so just follow the directions and I'm sure you'll be fine.

 

[Ainz_Ooal_Gown]

Yes that's exactly what you should do. I have a Sprint V40 and was bootlooping to the V40 fastboot. I followed this post . I uninstalled and deleted all LGUP and ADB programs and files, from previous attempts just to get a clean start. The three links in the post have everything you need except for firmware. Download the US unlocked PIE kdz. A link to the file can be found in the footer/signature of the OP. You're intuition is on point though, so just follow the directions and I'm sure you'll be fine.

Why thanks for clearing that up and pointing them in the right direction, cheers

 

[conmonks]

Just info to maybe clear confusion for some who is in a whirlwind (like me)

I've been bouncing between forums for a good few hours. I'm confused on what this one is forum is for (international v40s?) as I was able to Use LGUP on my Sprint V40 that was running 8.1 and flashed it to US unlocked kdz 9.0 (Pie?) without having my bootloader unlocked and not rooted (well i was never able to get into bootloader/fastboot to OEM unlock it).

but i do have a question, from what i gathered between all the sources i read... I need to contact someone to obtain the 35v engineering bootloader and flash to my device, so i have a bootloader that i can boot into for fastboot?

Im just trying to get TWRP but i have no bootloader or does not load with adb, volume down + power when plug in cable methods.