yashsingh1/xdaforums huggingface dataset:
[LG V30 Guides, News, & Discussion] ChazzMatt:
Going back to Canada H931 from US998 is notoriously difficult if you want to keep TWRP... You can't just flash from rooted US998 back to H933 via the Canada H933 TWRP-flashable zip. You have to go back via Partition DL, while keeping TWRP, plus do a couple of factory resets, then do YET ANOTHER Partition DL while keeping TWRP, etc.

[MENTION=4259007]christopherrrg[/MENTION] figured it out. See post #2 of this thread:

https://xdaforums.com/lg-v30/development/rom-fw-lg-joan-h933-canada-20g-twrp-t3868186

---------- Post added at 10:57 AM ---------- Previous post was at 10:26 AM ----------

FRANKENSTEIN TIPS

I've now added these two quotes to the Frankenstein Trouble shooting section and up higher wrote a couple of sentences to clarify about the USB debugging options. Yes, sometimes you have to revoke the permission and then re-enable it as [MENTION=3623561]cityneversleepz[/MENTION] mentioned.

___________

Also, it's amazing that you can do the exact same thing 3 or 4 times in a row with procedures like this, and the 4th time works. That's why whenever someone mentions the vapid definition of insanity (doing the same thing over and over and expecting different results), I realize that person has never worked deeply involved with computers or smartphones. :silly:

And NO, Einstein never said that. He was too smart to say that.

With procedures like this, which are proven, if it doesn't work the first time, do it again. ;) And look at the Trouble Shooting Tips.
[LG V30 Guides, News, & Discussion] crumbling9999:
On the F800L at least, I can't get it to recognize as a US996 after flashing the KDZ, even after booting, and entering the reboot loop it'd still be a F800L in LGUP, so no refurbish. Gonna try with the LS997 when I get it back. When I originally messed around with it, I briefly considered extracting the GPT table from the KDZ, and loading it with gpt while inside TWRP, but decided against it since I didn't have the tools to recover from a potential 9008 brick.

Edit: Tried it with the LS997. Got recognized as a US996 after rebooting, did the refurbish trick, but it still restart loop, presumably due to the /persdata issue
[LG V30 Guides, News, & Discussion] runningnak3d:
Are you trying to flash back Oreo or Nougat? You need to use Nougat.

-- Brian
[LG V30 Guides, News, & Discussion] RandomPooka:
Ok, a quick search of the thread tells me that the us998 can have the bootloader unlocked, and have twrp flashed. This means I'd be able to restore a data backup, install Magisk, etc.

My concern is whether the ls998 can be bootloader unlocked, or not to twrp in some way to allow me to MAKE the backup in the first place.

Next question is whether a Sprint backup (data partition only) can be safely restored to a us998
[LG V30 Guides, News, & Discussion] ChazzMatt:
All V30/V30+/V30S can be Bootloader unlocked, TWRP installed and rooted.

See the WTF INSTRUCTIONS thread. This thread is not about bootloader unlock and root. That one is.

https://xdaforums.com/showpost.php?p=76584629&postcount=193

Those are the instructions you will follow for LS998. You'll be brought back to this thread to temporarily convert to US998, then go finish the TWRP stuff, etc. That thread will answer all your questions.

Sent via open market LG US998 V30/V30+
[LG V30 Guides, News, & Discussion] RandomPooka:
That's excellent news. The last LG phone I personally owned was really bootloader unlocked. G3 lol... My kids had G4s and I remember those being a steaming pile of crap for development and unlocking. Sprint and Verizon both are notorious for locked down hardware. I just wanted to make sure that I would be able to attempt to backup and restore my data.

Then again, Google has come a long way with their data backup and restore when transferring to a new device or new rom
[LG V30 Guides, News, & Discussion] RandomPooka:
Just wanted to throw a thank you out there to everyone involved in figuring this out. I just converted my son's Sprint LS998 to US998 so I could activate it on our new T-Mobile account (Ditching Sprint for numerous reasons)

His device was leased, and had cracks all over the thing despite having full functionality. So, I know it would have cost me the same to return the leased device as it did to just buy it outright and Frankstein it to a US998. Was able to avoid losing my butt on that phone only to have a device that wouldn't work on my current carrier.
[LG V30 Guides, News, & Discussion] hammeru:
LG V30 US998 ( Converted from H931)

I recently had to do the same thing with a V30 from ATT after switching to T-Mobile. T-Mobile was unable to get wi-fi calling to work on their network even though the 931 was unlocked. So I went to XDA and Chazz Matt taught me how to turn it into a US998.

Many thanks!

My latest experiment is an LG G6 and I am having a good time with pie on it.

The people here are nothing short of amazing.

Have a good weekend...
[LG V30 Guides, News, & Discussion] crumbling9999:
Nougat, tried it with the US99610f KDZ. It was running a stock US996 ROM when I first got it, can't remember which build specifically, but it wasn't a DirtyCow-vulnerable version. I brought it and a F800L at the same time, so I downgraded both with the same F800L KDZ, which led to the bootloop problem. It'd run fine on VS995, LS997 and F800L ROM/KDZ, but US996-based ROM would exhibit the same problem. I even tried to dirty flash it on top of a fresh install to bypass the startup wizard, it'd reboot after the same amount of time, from the same error in logcat.
[LG V30 Guides, News, & Discussion] Cobra11Murderer:
Curious can you convert a ls998 to tmo version? Just for the bands and such?.
[LG V30 Guides, News, & Discussion] crumbling9999:
No. But you can convert it to US998, which has all T-Mobile bands outside of B71. If you want B71, you need to get a H872.
[LG V30 Guides, News, & Discussion] ChazzMatt:
No, and I make it very clear in the instructions. Even the title.

Right, and even the dev who rooted the T-mobile H932 is currently using a rooted US998 on T-mobile. He says the LTE band 71 isn't that important to him right now.
[LG V30 Guides, News, & Discussion] Cobra11Murderer:
Gotcha so if you want band 71 get a h932. I guess it's not that important where I'm at either as long as the wifi calling works. I know I talked to yeah about getting one before I finally am gonna make the jump. My Nexus 6 has been acting very strange.. and although I'm a tech guy ive about had it. Barely getting 3 hours of sot with new bat it's just done.

On the us998 I would guess wifi calling, volte and such work with tmo sim? Just making sure before buying this phone.
[LG V30 Guides, News, & Discussion] RandomPooka:
Can confirm that an ls998 converted to us998 will be able to enable wifi calling when using a tmobile sim. I did both of my kids ls998 devices this weekend, and both of them have it as an enabled option in the settings
[LG V30 Guides, News, & Discussion] ChazzMatt:
Close out LGUP.

Reboot the computer.

Go into the phone, turn on Dev Options if not already on. Revoke any ADB permissions, turn off ADB debugging, turn on again.

Go into Download mode manually, connect to computer.

Then re-open Dev Patched LGUP.

If it still won't let you flash 20b, then reflash US998 10d in Refurbish mode.

Then try again.
[LG V30 Guides, News, & Discussion] carbon271:
Still, nothing same issue if I tried doing refurbish mode and I can't go thru settings I'm stuck in Google Frp mode I just received the phone I bought it from eBay and have this issue the seller hasn't responded so I'm trying an alternate way to bypass it.
[LG V30 Guides, News, & Discussion] ChazzMatt:
I think [MENTION=2696368]TPMJB[/MENTION] had FRP issues with one V30 phone? Maybe he can help. Sorry if I'm confusing him with someone else.
[LG V30 Guides, News, & Discussion] carbon271:
I would definitely love the help if he figured it out is the only phone I got.
[LG V30 Guides, News, & Discussion] ChazzMatt:
Well, I just bought a mint Sprint V30+ 128GB with clean ESN for $350 on eBay. Going to turn it into an "AS998" for either my brother or my sister.

Now that we know this works, booyah.

LG V30™ | ACG

AS998 ACG

http://www.lg.com/us/cell-phones/lg-AS998-ACG-lg-v30

And Frequency Check is full of bull. These bands have ALL AT&T LTE bands, not "2 out of 4". That site is outdated. OK, doesn't have new LTE band 30, but has 2, 4, 5, 12 (which was 17).
[LG V30 Guides, News, & Discussion] jcsww:
Those should eventually get an update adding T-Mobile bands as well now that the merger is happening.
[LG V30 Guides, News, & Discussion] ChazzMatt:
Uhh, theoretically but don't hold your breath. Merger won't happen for at least another year (May/June 2019). At that point, V30 will be close to two years old.

The "new" T-Mobile will be more interested in offering "incentives"' for people to trade in their CDMA phones to purchase new hardware than upgrading older phones with new bands. ;)

Plus most Sprint phones already have almost all the T-mobile bands. Band 71 is not necessary to have T-mobile service. Almost all T-mobile phones don't have band 71 and those T-mobile phones work on T-mobile quite well. ;) People shouldn't be obsessed about Band 71 when 99% of all T-mobile phones don't even have that band.

Sent via open market LG US998 V30/V30+
[LG V30 Guides, News, & Discussion] jcsww:
I keep forgetting it's LG. :P I remember way back when Google added band 12 for T-Mobile as a usable band to the 6P, which was a very nice surprise. I hope T-Mobile pushes LG into merging the radios to basically create a T-Mobile/Sprint radio with all of those bands. It might not sell a few extra phones for LG but it would be a good olive branch for current V30 and G6 smartphone owners.
[LG V30 Guides, News, & Discussion] ChazzMatt:
I added this to my comment above but worth a separate post.

Plus most Sprint phones already have almost all the T-mobile bands. Band 71 is not necessary to have T-mobile service. Almost all T-mobile phones don't have band 71 and those T-mobile phones work on T-mobile quite well. ;) People shouldn't be obsessed about Band 71 when 99% of all T-mobile phones don't even have that band.

Here's the Sprint LS998 LTE bands:

2/3/4/5/7/8/12/13/17/20/25/26/41

http://www.lg.com/us/cell-phones/lg-LS998U-lg-v30-plus

Here's the T-mobile H932

2/3/4/5/7/12(17)/20/38/39/40/41/66/71

Not all those are actual T-mobile bands, some of those are for "roaming" on other networks.

But you see there's a lot of overlap.

By the way, LTE 12 includes 17. LTE 17 is a subset of 12, which is why T-mobile only lists 12 (even though they use AT&T LTE band 17 for roaming) and why AT&T now only lists LTE band 12 on their phones when technically AT&T uses 17. AT&T doesn't even list LTE band 17 since January 2017 on any of their phones -- since they now include LTE band 12 on their phones. So, very strange that Sprint still does list LTE band 17 when they don't even use that band. It's like saying "Georgia" and "Atlanta", when Atlanta is IN Georgia.
[LG V30 Guides, News, & Discussion] jcsww:
Yeah. Band 71 wasn't really my aim although I do tend to think of LTE first. It's more of the rural legacy bands I was thinking of in the end. Sprint has a few towers in souther WV where T-Mobile and AT&T don't. It would be nice to actually get access to those. I am not sure what they are running though but I think they were once a part of the old US Cellular network or one of the other little companies that doesn't exist anymore.
[LG V30 Guides, News, & Discussion] philcurious:
I did it, now using it on T-Mobile. Had a brick scare for a bit but eventually a factory reset prompt came on during some button combination and then it works again.
[LG V30 Guides, News, & Discussion] ChazzMatt:
Tell us more, please. Were you on Sprint Oreo?

Because one guy tried it and was able to flash AS998 KDZ (basically the "regional carrier" version of the US998, same thing), but not able to flash US998 KDZ.

AS998 is already on Oreo, but US998 is still Nougat (which is annoying as I own three). His phone was on Sprint Oreo.

Sent via open market LG US998 V30/V30+
[LG V30 Guides, News, & Discussion] datrmon:
Hello everybody,

I noticed my phone doesn't have high impedance mode.

It also makes a weird sound when I try to record or call using a plugged-in earpiece.

has anyone experienced this after crossflashing or is this a phone defect.
[LG V30 Guides, News, & Discussion] R800x_user:
In order to trigger high impedance mode you need to have headphones 30-50ohms or at least it's what I've seen floating around. I'm no expert on audio but the audio with the hi-fi settings to me is good enough.
[LG V30 Guides, News, & Discussion] suckme69:
i got mine booted to as version i was on ls and wouldntb stop rebooting so tried the us version well it worked just was buggy and then i flashed to vs and something wen wrong it wouldnt boot to recover system or to download mode and not showing imei so ig ill have to ship in under my warrenty if they accept it i also found this http://opensource.lge.com/osSch/list?types=ALL&search=ls998u
[LG V30 Guides, News, & Discussion] ChazzMatt:
Never mind. I thought that webpage has Oreo US998 listed.
[LG V30 Guides, News, & Discussion] Addiso:
It has the H932 Oreo listed. We don't even have Oreo yet.
[LG V30 Guides, News, & Discussion] rambu_1:
Hi...so after the crossflash from LS998 to AS998 is the network and APN setting accesible? Do you still have 128GB? Thanks!
[LG V30 Guides, News, & Discussion] ChazzMatt:
Phone hasn't arrived yet. One of Sprint guys said after flashing his no longer said V30+ in "About Phone" but still has the correct internal storage, I believe. I think because AS998 doesn't have V30+ variant. Of course it still says "V30+" on the back of the phone ;)

Sent via open market LG US998 V30/V30+
[LG V30 Guides, News, & Discussion] jcsww:
Sadly, no. I used to make fun of my H933's lack of updates but that got Oreo a few weeks ago.
[LG V30 Guides, News, & Discussion] papoose515:
another successful flash has been down!!! feeling great right now

---------- Post added at 08:07 AM ---------- Previous post was at 07:44 AM ----------

im getting low signal tho. can i flash to us998 if im on as99820b
[LG V30 Guides, News, & Discussion] Addiso:
Actually LG Bridge does have the h932 Oreo update.
[LG V30 Guides, News, & Discussion] jcsww:
I might have to pull that then. My V30+ has yet to receive it via OTA.
[LG V30 Guides, News, & Discussion] papoose515:
well i done ****ed up my v30.. i was successful on the first attempt with the as998 flash but then i tried to flash to the us998 and bricked my phone!!!
[LG V30 Guides, News, & Discussion] ChazzMatt:
I searched Google and found FRP bypass for LG V30. I think it's frowned on here to discuss in depth. But you can find it also. Good luck.

Sent via open market LG US998 V30/V30+
[LG V30 Guides, News, & Discussion] carbon271:
I have tried it is something to do with a bug and the voice assistant but I can never find the video so I'm never able to get it to work is why I've been looking for alternatives with no avail.
[LG V30 Guides, News, & Discussion] carbon271:
Well after a couple of hours I was able to have the original owner unlock the FRP lock while killing some time I was able to get the phone to show up as US998 I just needed the FRP lock gone and it was time to do everything after all that it's successfully rooted wanted to ask can I just flash any AOSP Rom now or is their something I need to do to be able to flash a Custom Rom Just want to Flash a Couple of the Aosp Roms to see what I Like best BTW Rooted on Oreo 20b at the moment.
[LG V30 Guides, News, & Discussion] ChazzMatt:
You need to update to newer rooted stock firmware. 20B is a year old.

Sent via open market LG US998 V30/V30+
[LG V30 Guides, News, & Discussion] carbon271:
Any advice on how to go about that? any Links? Sorry for the Noob question I'm just trying to avoid from doing something stupid LOL I always end up messing with something I'm just trying to be cautious.
[LG V30 Guides, News, & Discussion] ChazzMatt:
https://xdaforums.com/lg-v30/development/us998-lg-v30-us998-us99820a040330-kdz-t3786337

You want to end up with 20h.

Dirty flash US998 20E, F, G then H all back to back in TWRP-FLASHABLE ZIP. Then reflash Magisk and reboot.

Make a TWRP backup.

Sent via open market LG US998 V30/V30+
[LG V30 Guides, News, & Discussion] TPMJB:
FRP? What's that? I had an issue where I lost download mode on the H932, but only after I already had TWRP installed.

Edit: Ohhhhhhh yeah I actually did have that issue. It's fairly convoluted to work around. If you search on youtube for "google lock lg v30" there's a guide on how to do it. It's a rather grey area or I'd post it here.

Edit2: Chazz I rooted everything last November. You mean I should update my stock? Everything seems to work fine, though. I actually never installed a stock rom other than the one used for Bootloader unlock and root.
[LG V30 Guides, News, & Discussion] ChazzMatt:
Yes, newer stock rooted has major improvements and DTS surround sound.
[LG V30 Guides, News, & Discussion] dancarriv:
Hi.

I bought a V30+ LS998 from ebay. The post said it was US998, but the tag said LS998. It appears to have been converted to US998. It was Nougat 998.

Long story short, I had unlocked the bootloader and tried a couple of custom roms, always getting signal issues. So i relocked the bootloader and went back to Nougat, and then Oreo (998). Since I'm in Canada, I thought about crossflashing a 933 build through LGUP. I did Oreo 998 to Oreo 933. After this the phone would not boot It would only get to the LG logo after the LG V30+ Thinq screen.

I went back to LGUP, downgraded to 998 Nougat. The phone booted fine and I was able to got through the whole set up process. Since this is my phone to experiment, I tried flashing Nougat 933 on partition DL. The phone would not boot, and it would bootloop after the v30+ logo. Finally, to try to fix this, I flashed nougat 998 on partition DL. Since then, after flashing, the phone only gets to the bootloader screen, nothing more. I tried following the Frankenstein method step by step again, but no success getting past the bootloader screen. On download mode, the phone is recognized as US998 Nougat, and then US998 Oreo after I flashed Oreo. I am stuck on the bootloader screen and don't know what else to do to get it working again. Any suggestions?
[LG V30 Guides, News, & Discussion] ChazzMatt:
Try flashing via Refurbish mode. Almost never do you want to go Oreo to Oreo on stock KDZ. Try downgading to Nougat, then going to Oreo.

You are also doing Master Reset in between, right?

Sent via open market LG US998 V30/V30+
[LG V30 Guides, News, & Discussion] dancarriv:
Yes, I did this with the button combination. I'll post again once I'm done.

Thanks!
[LG V30 Guides, News, & Discussion] dancarriv:
I tried now via refurbish, still stuck on bootloader screen loop.

The process took about 30 minutes. LGUP used to show COM8, and it was fast. Now it was showing COM22 and it was slow.

Any other suggestions?
[LG V30 Guides, News, & Discussion] ChazzMatt:
Last time I updated my wife's phone, took forever. But I didn't dare unplug the phone.

Com ports can change, maybe because it's now recognized as a different device?

No I don't have any other suggestions. I'm sorry.
[LG V30 Guides, News, & Discussion] dancarriv:
I'll keep trying. I'll post once, and if, I fix it.
[LG V30 Guides, News, & Discussion] dancarriv:
Would you know, please, what is the original LS998 ROM for this phone? I'm going to try to flash to its original, native firmware, then Frankenstein-it, to see if that works.

I'm also going to try this:

https://xdaforums.com/android/general/unbrick-lg-model-download-recovery-t3060184
[LG V30 Guides, News, & Discussion] ChazzMatt:
There is no public stock LG KDZ firmware images for either Sprint LS998 or AT&T H931 and those carriers don't give updates to non-customers. They only update via OTA to users on their network. Carrier-locked phones. (Yes, the AT&T H931 can be carrier unlocked by code to work on other carriers --- but you still can't receive updated firmware. ) This is why people who buy those phones have to Frankenstein to a carrier-unlocked North American variant (US998, H933, AS998, VS996) which has publicly released KDZ available. We have TWRP-flashable Sprint firmware zips, hand built by excellent XDA devs, but you can only flash those via TWRP after bootloader unlock.

Of all those carrier unlocked variants (US998, AS998, H933, VS996), BEFORE WTF bootloader unlock (May 2018), it didn't matter which one you flashed -- except VS996 gives you annoying "no Verizon SIM card" notification when you reboot. But since WTF, US998 is considered superior because it also has fastboot flash commands, while all the others do not.

In fact, before Frankenstein (April 2018), only cell phone dealers with hardware Octopus boxes could flash from one variant to another. They may have leaked Sprint and AT&T KDZ, but we don't.

Dev Patched LGUP allows us to do (via software connected to our computers) what professionals can do with Octopus box. Or at least MOST of what they can do.

But speaking of dealers/pro repair people, I'm dealing with someone right now who bricked his phone, and had someone unbrick it for him for a fee -- and now he's stuck on AS998. They unbricked his phone and flashed it to AS998 Nougat (no fastboot flash commands and not even Oreo). :rolleyes: He can't seem to flash anything else successfully and has wiped out the AS998 Nougat he was on. He's stuck on bootloader screen and I can't help him. Whatever the repair person did seemed to change/damage whatever we use for Frankenstein.

I sort of understand the Nougat part. [MENTION=3167089]runningnak3d[/MENTION] says LG put another check into Oreo firmware which (most times) won't let you flash Oreo to Oreo different models -- and perhaps even Octopus box can't bypass that. So you have to flash to Nougat first (which doesn't have that check). THEN, you can flash Oreo of the variant you wish to upgrade. But AFTER the repair person unbricked the phone and flashed to AS998 Nougat, the repair person should have then updated the phone to Oreo. And why AS998? At this point in time, that's basically useless. For reasons unknown, there's no publicly available Oreo firmware for AS998 past 20b (a year ago). I've

helped people change from AS998 to US998

, but in this more recent case I can't help.
[LG V30 Guides, News, & Discussion] dancarriv:
So the problem was Oreo 998 to 933? But after I did that, I went to Nougat 998, and then Nougat 933, and that's when I got stuck.

Anyway, thanks a lot.
[LG V30 Guides, News, & Discussion] ChazzMatt:
Analyzing your original post again... Last night I was on my phone having to type, now I'm on my computer.

Yeah, with only one exception I'm aware of, you can't flash Oreo to Oreo on North America variants, due to check LG put into Oreo firmware.

An aside: I'm not sure why you re-locked the bootloader... :p Having TWRP and root and Magisk modules are fantastic. I still have never flashed any custom ROMs on my phone (and with other devices that's all I ever used). On this phone, having ROOTED stock firmware plus some mods are great.

Still, it's your phone and you use it as you please.

So, at that point in time you were fine.

The next section is what I can't explain:

Flashing H933 Nougat should have worked, via Partition DL. If that didn't work, your next step of flashing back to US998 Nougat via Partition DL also should have worked. (As I noted above, you had phone working fine on Nougat US998 before these last steps.)

I may have suggested this before, but the only thing I can think of is to flash US998 Nougat again but this time using Refurbish method. Then, try flashing US998 Oreo via Partition DL or Refurbish method. With H933 variant (which you flashed to, even though not successfully) you can't use "Upgrade" mode from US998 Nougat to US998 Oreo with Frankenstein. Something about the H933 stays as a ghost even in Frankenstein. So you have to use more force. (This is also why former H933 have to do more prep to flash AOSP/Lineage custom ROMs.)

Other than that, I have no other suggestions.