yashsingh1/xdaforums huggingface dataset:
[LG V40 Guides, News, & Discussion] AsItLies:
the sahara error is, unfortunately, commonly experienced. There are numerous suggestions to fix it, seems though the most common fixes are to 1) be sure to use a usb 2.0 port 2) try different cables, ideally u want a data cable not a charging cable 3) be sure the driver you are using is signed, an unsigned one will install with a message it's not signed, it's easy to ignore. 4) some have used a different computer and gotten it to work.

Qualcomms qfil software is old software, it does work but it can be difficult to get the right combination of things correct.

cheers
[LG V40 Guides, News, & Discussion] Malkierian:
What about the Firehose error I get first? It's instantaneous when I try to open the partition manager the first time.
[LG V40 Guides, News, & Discussion] AsItLies:
I think if you fix the sahara error that will also get taken care of.
[LG V40 Guides, News, & Discussion] degarb:
quote: "

Booting into EDL:

Note: This can be done while booted!

1. Plug in your Phone to your PC

2. Press and hold Power and Volume Down

3. As soon as your screen blanks, rapidly start pressing volume up.

4. If you've successfully booted into EDL, your screen will be completely blank and the device manager will show (Under COM Ports): Qualcomm HS-USB QDLoader 9008"

This doesn't work on my LG 40, it just takes a screen shot and reboots the phone back into android.
[LG V40 Guides, News, & Discussion] Malkierian:
The phone has to be off before these steps are taken. I don't know why it said that they can be done while booted.
[LG V40 Guides, News, & Discussion] AsItLies:
In both cases, the phone off, the phone on, the phone on any screen, even if it's bootlooping...

the device can be put in edl mode.

With the phone on, and you press and HOLD the vol minus and pwr, yes, it does take a screen shot, but if u continue to hold u will get a 'count down' msg, counting down from 5 secs. Once the countdown is over and the screen blanks, u continue to hold vol minus and Pwr but also start spamming the vol plus key as quickly as u can.

When not on the phone booted screen, you press and hold vol minus and pwr and kind of 'time it' (because u won't get a 5 sec countdown screen), before spamming the vol plus key.

Getting the timing right, of when to start rapidly pressing the vol plus key is difficult, it takes practice. It can work the very first time, or it can take 5 tries.

the thing to understand about qualcomms edl mode, it's built in, it can't be disabled and it can't be 'not working'. It always works, you just have to keep trying until u get the key combo right.

cheers
[LG V40 Guides, News, & Discussion] kanaan360:
So I got a software update to the same build I was already running I'm assuming it would have rewrote my corrupt? bootloader partition. How would I check if that is the case and before I try again how can I check what slot I'm currently running in
[LG V40 Guides, News, & Discussion] AsItLies:
You got a software update to the same build? Then that was probably a security update, they are usually small, only a 100 or so meg.

You're wondering if it re-wrote your corrupt bootloader partition? So, how did the phone boot (to get the update), if u have a corrupt bootloader partition?

what made u think u had a corrupt bootloader in the first place? Isn't that the same way you would 'check it'?

the only ways I know to check current slot is with twrp or fastboot.

cheers
[LG V40 Guides, News, & Discussion] kanaan360:
I flashed the engineering bootloader, rebooted without OEM unlocking and got a red triangle. Auto reboot into the system afterwards and no red triangles going forward but even if I use qfil to reflash the engineering bootloader I can't seem to get anywhere near fastboot mode, either going into lgupdown, recovery or the system

I thought my abl would be corrupted or otherwise inaccessible potentially
[LG V40 Guides, News, & Discussion] AsItLies:
Well, here's something important to know and realize it's a given; If the phone boots, then the abl isn't corrupted. ABL stands for Android Boot Loader. Phone don't boot if that don't work.

What probably happened, is u flashed the engineering abl, and didn't do the remaining steps, which the last one would have been to flash your original abl back.

The point of the eng abl is one thing: to unlock the bootloader. It doesn't boot the phone unless the rom you have is Oreo. Yer probably not on Oreo. So the phone probably tried the other slot, and that's prob why u got the same update as before.

It also sounds like u don't know what yer doing. I'd recommend re-reading the guide, slowly. numerous times.

If a step doesn't make sense, ask questions about that step. One step at a time.
[LG V40 Guides, News, & Discussion] kanaan360:
Fair enough, I'm not used to LG or Verizon. Frankly surprised any progress has ever been made on this phone model given how heavy Verizon is with that lock hammer.

I'm here to learn though

I'm on Verizon's Android 10 build and I figured my bootloader wasn't actually corrupt, but it does seem to be inaccessible by the user currently. And if it doesn't boot on non Oreo roms why'd it boot the first time? And further how should I downgrade to Oreo so I can proceed?
[LG V40 Guides, News, & Discussion] kanaan360:
And you're right, I didn't do the remaining steps. Fastboot wasn't working for whatever reason to flash the FRP. i tried everything shy of finding a physically different computer
[LG V40 Guides, News, & Discussion] Malkierian:
OK, so I figured out I'd missed the little bit about selecting UFS in the bottom-right of QFIL, did that and it connected just fine. I went to abl_a and abl_b, backed them up, then uploaded the engineering bootloader. Backed up laf_a and laf_b, then erased them. Restarted out of EDL and held volume down, phone just booted normally. What did I do wrong?

EDIT: Now I can't get into EDL mode, either, to try to reflash the booloader. If I try to just hold volume up after rebooting (holding Power and VolDown), I get a message saying "Your device has failed a routine safety check and will not boot."
[LG V40 Guides, News, & Discussion] AsItLies:
So first, the only reason you would want to erase the laf partitions is that it will give you a 'watered down' version of fastboot (instead of lgup).

So, if you don't want or need a 'watered down' version of fastboot, then there's no reason to do that (erase the lafs). And, to get to this 'watered down' version of fastboot, you'd do the same key combination you'd normally use to go to LGUP, not the ones you'd use for fastboot.

The only thing I can think if you are using the correct key combo to get to fastboot, are u leaving the usb cable plugged in? That has to be plugged in for it to work.

Finally, edl mode is difficult to get to, it's tricky and the timing usually takes a few tries to get right. But, you can never NOT get to edl mode, it can't be disabled and it can't be erased. It's built in. If you are not able to get to it, try try try again. That's really one of the beauties of this device, you can ALWAYS get to edl mode, no matters what the state of the device is (bootlooping, etc). It ALWAYS works, u just have to keep trying.
[LG V40 Guides, News, & Discussion] AsItLies:
You're misunderstanding the point that the eng abl is Oreo. The point is that it won't boot (normally) if the rom isn't Oreo. But you don't need the eng abl to boot the phone, u just need it to use fastboot to unlock the boot loader. After you've unlocked the bootloader, as the directions say, you're suppose to flash your original abl back, so the phone can then boot normally.

While some have been able to boot their a9 or a10 rom with the Oreo eng abl, they've had other problems once booted, so it's not recommended. Only use it to unlock the bootloader, then be done with it.

Proceed with your new understanding, then, if u run into a problem, stop. And post here with where u are stuck, the group will try to help.
[LG V40 Guides, News, & Discussion] Malkierian:
How is my phone booting normally if I have the engineering bootloader on there but run a v10 ROM?
[LG V40 Guides, News, & Discussion] AsItLies:
It just means that you're one of the lucky ones, that it manages to boot with that abl. But, others have done that and run into problems, and that's why it's recommended to not do that.

But the point isn't really that it may or may not boot, the point is to use the eng abl, unlock the bootloader, than flash the original back.

that's all the eng abl is for, unlock the bl, u don't need it after that.
[LG V40 Guides, News, & Discussion] Malkierian:
Yes, I am leaving it plugged in. If I have the LAFs erased and the bootloaders on there, can I still get the normal fastboot with the combination required? Can I get to fastboot if I'm not restarting from EDL? EDIT: Also, plugging the phone in while it's off just takes it to the offline charging screen, nothing about fastboot. Whether I hold volume down and power and just release power when I hear the disconnect noise, or release both and press volume down again, it just boots normally.
[LG V40 Guides, News, & Discussion] AsItLies:
yes, u can bet to normal fastboot with combo.

yes, u can get to fastboot without starting from edl.

yes, just plugging phone in when off will go to charging. why would it go to fastboot?

"Whether I hold volume down and power and just release power when I hear the disconnect noise, or release both and press volume down again, it just boots normally" when are u doing this? From what screen? From EDL?

If that's the case, u really really need to stop over complicating things by doing anything other than what the instructions say. If they say to just release pwr and keep holding vol down, then do that. If that doesn't work, then ask for help.

If you tell a million things you've tried and all kinds of discombobulated combos, it becomes difficult to follow and leads to uncertainty u even did what u were suppose to do.

If u are doing exactly as u should be doing, and u still can't get to fastboot, there are other things we can look at as possible issues. but first, it needs to be established u are doing exactly as u should.

cheers
[LG V40 Guides, News, & Discussion] Malkierian:
Part of my questions have been to clarify what I'm supposed to be doing. And I went to other posts in the thread to try to figure out if those other options solved my problem. So I told the options I tried that satisfied directions I thought could have meant multiple things and mentioned other troubleshooting things I tried so we could eliminate those as possibilities, as well as bringing up other conditions I have because of the state my phone is in after following those instructions. My bad for wanting to be more efficient and not unnecessarily clutter up the thread with repeat issues if at all possible.

Now, to address your questions.

At least half a dozen troubleshooting and/or fastboot guides out there say to power down the phone and plug it in while holding the volume down button to get to fastboot. I wasn't JUST plugging it in.

I've done this from EDL, from normal off, and from booted.
[LG V40 Guides, News, & Discussion] AsItLies:
Well for me, it's better to eliminate issues one at a time, to be sure those aren't the mistakes. Personally, I hate to spend a lot of time trying to figure out a problem, only to find the issue was a simple thing in the initial stages that was misunderstood.

It would be better for someone else to try to help, maybe someone more appropriate for your 'more efficient' style. Good luck.
[LG V40 Guides, News, & Discussion] Malkierian:
Look, I admit, I was pretty passive aggressive with my response, and I apologize for that, but you could have put it differently too, something like "let's slow down and take it one step at a time" or "let's start from the beginning just to make sure". We did have different styles, but my proactive approach isn't "over-complicating things", nor was I telling "a million things" that I had tried, just a few possibilities that were already addressed in the thread that I was mentioning I had tried. And a forum makes me want to do that because it's such a slow form of communication. Most of my previous experience has been the feeling of exasperation from other people because of my not being proactive. Not to mention, up to a certain point, I'm not just waiting for responses here in my attempts to troubleshoot this problem, so I figured letting you know about other things I'd tried would help you narrow down possibilities. I couldn't know you wouldn't see it that way.

Please, if you have any other ideas, I'm willing to try your way. Other sources have dried up now.
[LG V40 Guides, News, & Discussion] tmpj1524:
hello, firehose did not download. trying to root a verizon lg v40. how do i get it to download? i've got qpst, and qfil, and no luck

thank you
[LG V40 Guides, News, & Discussion] kris597:
Currently on an original sprint model crossflashed to to verzion 10.0. When i try to enter the bootloader, it just reboots normally. Do i need to downgrade back to sprint 9.0 and then go through the process again ?

Update: Got it to work , however, i did not backup my abl files and am now bricked. Before i go through the process of reflashing the kdz, does anyone have the abl files for verizon 10.0
[LG V40 Guides, News, & Discussion] AsItLies:
These are the abl, boot, laf for vzw 30c. Pretty easy to extract them from the kdz with kdz extractor.

cheers
[LG V40 Guides, News, & Discussion] kris597:
Unfortunately, these didn't work for me. I cross-flashed the us 9.0 version and I successfully unlocked the bootloader. However, when I try to go back into fastboot, I'm met with a message saying " Your device is unlocked " and it boots me back to the main OS. Anyone else having these issues ?

Edit: I had to reload the v35 images to get back into fastboot. However, i am now getting

downloading 'boot.img'... OKAY [ 2.124s]

booting... FAILED (remote: Failed to load/authenticate boot image: Load Error)
[LG V40 Guides, News, & Discussion] zfk110:
I got the same issue, after flashing abl_a with eng35 phone wont boot into fastboot it will boot into stock, I think we need to downgrade to pie unlock the bootloader, then upgrade back to 10 and then go from there.

Edit: I reflashed 30C Kdz which is 10 again and then I tired with ABl-b flashing with v35 now I can boot into fastboot.
[LG V40 Guides, News, & Discussion] timekeepercookie:
Hi, all, hope I can get some help. I'll try to be as descriptive as possible with my issues.

So I've got a LM-V405UA (Verizon, USA, factory reset, Android 10), and despite many, many attempts, I can't seem to get into 9008 mode. Or maybe my computer isn't recognizing it properly...? I will say--I don't have the "enable OEM mode" in my developer options.

When I restart by holding power + down and then by tapping up, I'm able to get into Download Mode and the screen goes to the firmware update "Do not unplug the USB connection until the process is complete" screen. But that doesn't seem to line up with what I should be seeing (a blank screen?). In my device manager, the phone shows up as an "LGE AndroidNet USB Serial Port (COM7)." I have QPST installed from the thread. If I should share any other info, I'm happy to, but I can't think of anything beyond this. Any and all help would be appreciated.
[LG V40 Guides, News, & Discussion] AsItLies:
So without the 'enable oem unlock', follow the directions and be sure to flash the 'frp' indicated.

To get to edl mode is difficult at first. With the phone booted, press and hold both vol minus and pwr buttons. Continue to hold them and when u see the 'count down' screen, wait until it reaches 0 and the screen blanks, then quickly start pressing vol up on and off as quickly as u can (continue to hold the other 2 keys down).

If the phone goes blank and stays there, you're in edl mode. If it reboots, try again. Many people, even those with experience doing this, find it takes several tries.

cheers
[LG V40 Guides, News, & Discussion] netookska05:
I was getting the same sahara error. It comes from the phone not being in EDL mode correctly.

Just keep putting the phone into EDL mode. I'm a Verizon user G710VM and I went back to Oreo to unlock bootloader and rooted.

I cross flashed back to Pie and of course no fastboot. Hope this helps.
[LG V40 Guides, News, & Discussion] SuperMike393:
Yeah, I guess ill just keep trying then. If thats the case then Im assuming it just comes down to luck then. Kinda discerning that I dont know if getting into EDL mode correctly (it shows up in device manager correctly). Thanks for the help
[LG V40 Guides, News, & Discussion] geminihc:
i have a sprint locked v40, does this mean i can do this to bootloader unlock it , and then possibly flash another variant so taht it is NETWORK unlocked as well?

thanks!
[LG V40 Guides, News, & Discussion] KouaV1:
I have the USA Unlocked LG V40 5QA7 so will this work on mine? The part where it says ablpiestock, Do I put replace it with abloreostock? Sorry my LG V40 is still on Oreo because Pie was too slow and gaming was half fps so I downgraded and stayed with oreo
[LG V40 Guides, News, & Discussion] argon9898:
According to the title, I should be able to unlock my AT&T variant of LG V40 with no problem?
[LG V40 Guides, News, & Discussion] netookska05:
I am running QPST on Windows 7 pro. You might try uninstalling QPST and any Qualcomm drivers and then reinstall QPST or try another computer.
[LG V40 Guides, News, & Discussion] argon9898:
I'm having a bit of trouble with my AT&T variant. As I pressed volume up button, the phone instead went into download mode. I have tried countless times already, what can I do?
[LG V40 Guides, News, & Discussion] Infy_AsiX:
are you continuing to hold volume down and power while quickly pressing the volume up at that step?
[LG V40 Guides, News, & Discussion] argon9898:
I did, and I also tried removing both fingers and repeatedly pressing volume up, still no results. Am I supposed to press volume up once or repeatedly?
[LG V40 Guides, News, & Discussion] argon9898:
Okay, so for anyone who struggles to get into the EDL mode, follow my steps.

The key to activate EDL mode is to hold both POWER + VOL UP + VOL DOWN while the phone is still on. In about 8-10 seconds the screen will turn off, keep holding POWER + VOL DOWN while REPEATEDLY PRESS VOL UP. That should get you into EDL mode.

Try a few times and you'll succeed.

---------- Post added at 12:19 AM ---------- Previous post was at 12:18 AM ----------

After 3 hours of trying, I was able to flash the bootloader image into abl_a (log says 'Finish sending image', I don't know if that counts as successful), but I yet again, failed to restart into fastboot by holding power down only as it just restarted right into OS afterwards. Should I re-flash the bootloader or not? What should I do about not being able to restart into fastboot right after 9008 mode?
[LG V40 Guides, News, & Discussion] KouaV1:
Based on the post willmy US unlocked LG V40 5QA7 work? Tittle says any except t mobile. Can the op or someone confirm please? I dont want to risk bricking.
[LG V40 Guides, News, & Discussion] Yzakz:
I connect the phone to PC, press and hold PWR+VOL- and when the screen goes blank I press VOL+ while pressing PWR+VOL- and then the screen stays blank. But in Device Manager doesn't appear as "Qualcomm HS-USB QDLoader 9008", instead it appears as "QUSB_BULK_CID:0402_SN:E639940D". What am I doing wrong? How can I fix this??

P.S: I doesn't appear under "Ports", it appears under "Other devices". Actually there is no "Ports" category under Device Manager list.
[LG V40 Guides, News, & Discussion] cogpie:
Just to add in that you will also need to have your cable plugged in, I never managed to get into EDL (9008) Mode without. It could be that it is possible but the timming is tighter due to not having to do any cable checking/comms as it boots up. So ensure it is plugged into your computer to up your chance, or indeed make it possible at all.

(For context, mentioned buried in my previous long post...)

(...shame we can't have 'wiki-like' original posts for these sorts of tutorial things to keep them updated than having to trawl the comments :))
[LG V40 Guides, News, & Discussion] Yzakz:
Well, I installed a Qualcomm driver, rebooted the PC and now my phone appears as Qualcomm HS-USB QDLoader 9008 (COM4), looks like everything is ok now.
[LG V40 Guides, News, & Discussion] argon9898:
Btw, I couldn't seem to boot to bootloader from 9008 mode, I released the power button as soon as the phone connects to my laptop but nothing happened, it just booted straight right into OS. What did I do wrong?
[LG V40 Guides, News, & Discussion] KouaV1:
help! My phone LG v40 5qa7 I cant flash the ablpiestock.img, adb says : no such file or directory. My software im still on Oreo so is that why?

Edit: Hello guys I am succesfull at bootloader unlocking LG V40 5QA7 US Unlocked model. you only need steps all the way to step 2! Still have fastboot access and download mode access. Please correcty me if im missing something but yes I have confirmed.

I was su[prised everything got deleted and fgot bootloader unlocking does that but at least I had everyone on my contacts written down in my small notebook before doing this.

DONE!
[LG V40 Guides, News, & Discussion] argon9898:
After so many tries, I have successfully managed to unlock my bootloader. How?

The problem was my phone was active at slot B, while the guide only mentioned flashing abl_a (which belongs to slot A) which I overlooked while doing it. I noticed there was also an abl_b (which belongs to slot B) so I went ahead and made a backup then flash it. Success!

So yeah, one little thing to take notice of: Try flashing both abl_a and abl_b (remember to make backups before you do)
[LG V40 Guides, News, & Discussion] KouaV1:
do we need both?

---------- Post added at 05:23 PM ---------- Previous post was at 05:22 PM ----------

so quick question how to install twrp for oreo? found one 1 xda but then my phone just reboots and wont temporary load the twrp img

https://xdaforums.com/lg-v40/development/twrp-lg-v40-judypn-t3970111
[LG V40 Guides, News, & Discussion] argon9898:
Yeah imo for good measure, since we don't know which slot is active. But most V40s are active on slot A, so there wouldn't be a problem flashing only abl_a, but when that didn't work perhaps my solution would work.
[LG V40 Guides, News, & Discussion] KouaV1:
seems that i already done it and qfil will just give me an error on sahara or whatever it is so i cant do abl_b :(. but how to you get TWRP flashed? the link i gave the twrp keeps failing when i flash it? do i need to be on pie?
[LG V40 Guides, News, & Discussion] timekeepercookie:
Thank you--the issue I was having was that I wasn't holding down the volume down + power buttons while also tapping the volume up button. With your help, I was able to get into 9008 mode, and then load and flash the V35 image to my device.

However, I'm now struggling to get my phone to properly fastboot. When leaving 9008 mode, I hold down the volume down key, but the phone seems to start as normal, and fastboot devices doesn't detect anything. Am I supposed to hold down any other keys aside from volume down after restarting the phone out of 9008 mode? And--if I fail to get into fastboot after flashing the image initially, do I need to re-flash it every time?

Thanks so much (to whoever offers any more advice).
[LG V40 Guides, News, & Discussion] AsItLies:
Which partition(s) did u flash the v35 abl to? abl a and b? See, if u don't know which is the **current** slot (which one is booting), then u have to flash it to both.

Also! and don't forget or miss this, ea of the current abl (a and b) need to be backed up first. This is because the phone (almost assuredly) won't boot with the engineering abl (it's Oreo). So, u flash it, use it, then flash the original abl's back (so the phone will boot).

Some, myself included, will use fastboot to find the current slot, then flash the v35 eng abl to the other slots abl. That way you can use twrp to switch slots, reboot bootloader, use fastboot for whatever, then use fastboot to set the other slot active and reboot.

a bit tedious but it works with least amount of hassle.