on the subject of modem bin flashing - LG V30 Questions & Answers

Alright, so long story short I'm running JW's sprint21a software version after following the guides on Frankensteining and rooting the V30. Ever since August 16th I've been getting update messages to update to the newest version from sprint. Sadly, this update isn't available as a zip anywhere to flash via TWRP like I did when I converted from US998 after rooting to LS998 to restore LTE and the sprint bands.
I've been reading a bit and asking question in a few other threads and it would seem the latest US998 version is 20d and coincided with the new LS update as well. I'm wondering if it'd be feasible to flash 20d via TWRP so I can have the newest security update, then flash the sprint modems by themselves from JW's 21a file or not. I'm just wondering how feasible this would be. I'm not entirely sure if flashing a modem from a different (and older) version of the software would work with the newer and different one or not.
If it is feasible, my next question is how I would go about flashing just the modem files. I cracked JW's zip file open and I can see theres a modem.bin file in there. I'm wondering if I could wipe everything else in the zip out and leave that, then flash 20d via TWRP, then the modified zip with only the modem, followed by root,no-verity, and rctd...
Will this idea work, or am I missing something vital either in the procedure or is the idea itself not possible? Any thoughts or feedback would be greatly appreciated!

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Sure you can

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Go here
https://forum.xda-developers.com/lg-v30/how-to/making-modem-bin-flashables-twrp-t3794435
Post #5 grab modem.bin rename to .img(from .bin) flash as image in TWRP
First flash rom,magisk or what ever else you like then boot once you set up go back to TWRP flash modem reboot and ad apns reboot and profit
See

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ricohz said:
Go here
https://forum.xda-developers.com/lg-v30/how-to/making-modem-bin-flashables-twrp-t3794435
Post #5 grab modem.bin rename to .img(from .bin) flash as image in TWRP
First flash rom,magisk or what ever else you like then boot once you set up go back to TWRP flash modem reboot and ad apns reboot and profit
See
Click to expand...
Click to collapse
How do you have that nice black theme? WANT!
Sent from my LG-LS998 using Tapatalk

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ricohz said:
Go here
https://forum.xda-developers.com/lg-v30/how-to/making-modem-bin-flashables-twrp-t3794435
Post #5 grab modem.bin rename to .img(from .bin) flash as image in TWRP
First flash rom,magisk or what ever else you like then boot once you set up go back to TWRP flash modem reboot and ad apns reboot and profit
See
Click to expand...
Click to collapse
ahh ricohz you're my hero!! I'm goign to download these and give it a shot in the next couple of days when I have some time off from work to really toy around with it. Thank you so much!

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JesseAaronSafir said:
How do you have that nice black theme? WANT!
Link fixed
Sent from my LG-LS998 using Tapatalk
Click to expand...
Click to collapse
https://play.google.com/store/apps/details?id=com.lge.theme.pixterial
One I have
https://play.google.com/store/apps/details?id=com.lge.wsdeveloper.g7black
Free one that's almost the same
@txag2011
No problem

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ricohz said:
https://play.google.com/store/apps/details?id=com.lge.theme.pixteria
One I have
https://play.google.com/store/apps/details?id=com.lge.wsdeveloper.g7black
Free one that's almost the same
@txag2011
No problem
Click to expand...
Click to collapse
I don't find that "pixteria" one in the play store. The link seems broken. I do see the 2nd one, which is free and I installed it.
These don't have anything to do with substratum, right? I've played around with substratum some but have run into a situation where everything goes black and you can't navigate the screen anymore so I have to revert with TWRP. I think it has to do with themeing SystemUI but I'm not sure. I know that substratum has an addon that you can use if you don't have root but it requires hooking up to a computer. As I have root, I was thinking I should be able to use substratum without that addon and without hooking up to a computer. Anyway, I haven't had great luck with it so far.
It looks like this "G7 Black Theme for LG V30 & G6 Oreo" from WSTeams uses the native theming engine of LG V30 instead. I see that it themed the keyboard as well. NICE!! THANKS FOR THIS!!

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ricohz said:
Go here
https://forum.xda-developers.com/lg-v30/how-to/making-modem-bin-flashables-twrp-t3794435
Post #5 grab modem.bin rename to .img(from .bin) flash as image in TWRP
First flash rom,magisk or what ever else you like then boot once you set up go back to TWRP flash modem reboot and ad apns reboot and profit
See
Click to expand...
Click to collapse
Hi, when I was trying to flash this modem.img it was asking me how I want to flash, recovery, boot, system and LAF/ DL, I chooses system and now it wont boot up, I didn't have option for Modem Im using this TWRP-3.2.3-6-IntSD.img so which is the best option for me to choose to install modem.img

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zfk110 said:
Hi, when I was trying to flash this modem.img it was asking me how I want to flash, recovery, boot, system and LAF/ DL, I chooses system and now it wont boot up, I didn't have option for Modem Im using this TWRP-3.2.3-6-IntSD.img so which is the best option for me to choose to install modem.img
Click to expand...
Click to collapse
@seadersn, he can grab an older version of your TWRP and flash that, can't he?

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ChazzMatt said:
@seadersn, he can grab an older version of your TWRP and flash that, can't he?
Click to expand...
Click to collapse
Yes that what I did I went to older TWRP and it had a option for Modem, now my phone's settings looks like attach zipped file

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zfk110 said:
Yes that what I did I went to older TWRP and it had a option for Modem, now my phone's settings looks like attach zipped file
Click to expand...
Click to collapse
What modem image did you flash? For another LG V30/V30+ variant?
Strange your software version now says US998 21A with May 2018 security patch. That SHOULD BE 20A. There's no such thing as US998 21A...
You ONLY flashed modem image using the older TWRP?
@seadersn?

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ChazzMatt said:
What modem image did you flash? For another LG V30/V30+ variant?
Strange your software version now says US998 21A with May 2018 security patch. That SHOULD BE 20A. There's no such thing as US998 21A...
You ONLY flashed modem image using the older TWRP?
@seadersn?
Click to expand...
Click to collapse
I Frankensteind my LS998 to US998 using your method then went back to LS998 using this
Sprint 21a(may security patch)
https://forum.xda-developers.com/lg-v30/how-to/us998-to-ls998-sprint-lte-root-t3802310
I haven't try to activated the phone with Sprint to see if its going to work, I thought let me try to get the correct modem flashed first
this is the modem.bin I used, I was told I have to change bin to img and then use twrp to flash it
https://forum.xda-developers.com/showpost.php?p=76603286&postcount=5

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ChazzMatt said:
What modem image did you flash? For another LG V30/V30+ variant?
Strange your software version now says US998 21A with May 2018 security patch. That SHOULD BE 20A. There's no such thing as US998 21A...
You ONLY flashed modem image using the older TWRP?
@seadersn?
Click to expand...
Click to collapse
maybe main firmware differs from used system image. something got mixed up, jep. but to be honest, i can't fully imagine what happened there, really it's modem.image flashing to system. fw version is stored in modem image too, but.. i don't know
ChazzMatt said:
@seadersn, he can grab an older version of your TWRP and flash that, can't he?
Click to expand...
Click to collapse
newest 6a has correct modem partition handling added back, better use this one.
zfk110 said:
Hi, when I was trying to flash this modem.img it was asking me how I want to flash, recovery, boot, system and LAF/ DL, I chooses system and now it wont boot up, I didn't have option for Modem Im using this TWRP-3.2.3-6-IntSD.img so which is the best option for me to choose to install modem.img
Click to expand...
Click to collapse
first install new recovery 3.2.3-6a, then reboot to recovery and wipe cache. a system.img fitting your current main firmware should fix this. format system and flash the system image. the appropriate (or wished) modem can then be flashed via image flashing function to modem partition.
sry, was busy the last few days will not get really better because of christmas, bdays, broken car lol... but every two to three days i'm looking in xda there'll be a little update to twrp too, because some op partitions are available now. there's just an op image flashing function added (and some gatekeeper files for lockscreen settings tests), could be possible that this comes this weekend.