Database Info

Roms for LG Optimus T P509

Are roms for the optimus one compatible with the optimus t? I am interested in upgrading from stock to gingerbread or ice cream sandwich but I can't seem to find a straight answer anywhere online, including XDA...
Thanks in advance
Tiberius
Sent from my SGH-T959 using XDA

Yes. Roms for Optimus one are compatible with Optimus T. You will lose WiFi calling though. There may be a few problems with the new baseband though, as mentioned here:
Turducken said:
Any P500 rom that uses the old baseband will work flawlessly on the P509. In fact the only thing I miss about the official rom is the missed message notification on the lockscreen. CM7 is superior is every other way IMO. Once the bugs are ironed out with Oxygen, AOSP and andys Phoenix I think we'll have one of the best selections of Gingerbread roms available on any phone.
Official LG GB utilizes the new baseband. The P500 baseband does not include the 1700 spectrum. This represents half of TMOs 3g network (according to Wiki).
I've flashed the P500 baseband and had no major problems. However, weird things like the launcher only showing 3 buttons instead of 5. When my phone booted it up it took an extra few seconds before I had network reception. Battery life was slightly worse compared to Official froyo. I errored on the side of caution and went back to the old baseband. Also, the idea of only having access to half the available 3g towers was a huge turn off.
LG released the update for the Optimus One and considering Gingerbread is just a refresh of Froyo, I did expect an update. Since the Optimus V, P505, P506 and all other U.S. versions of the Optimus One haven't received the update, there's little hope and little room to complain. That doesn't change the fact that I feel I've been cheated.
My only concern is if LG releases the sources for the new baseband, will the great 01 devs start to phase out support for the old baseband?
Click to expand...
Click to collapse

optimus-t roms
I have the same phone and have tried many of the roms you can find here.
An excellent one to try is:
[UNOFFICIAL][ROM][stable:6.5.8,testing:6.6.1] CyanogenMod 7.1.0 (Android 2.3.7) by Mik_os no wifi calling as mentioned, but super stable w mostly everything working.
another good candidate is:
[ROM][10JAN] CyanogenMod 7.2.0-RC0-OptimusOne-KANG [.32][.35][BothBasebands] by adfad666
also [DEV-ONLY][ROM] CyanogenMod 7.2.0-RC0 Nightlies are coming along, I have run several builds, and they are very good, you need oldBBfix.zip for them to work with the old baseband (which is true with many roms if you get no data after flashing)
I'm currently running Lupohirp's very nice [Unofficial][ICS 4.0.4]CyanogenMod 9[LGP500] this rom is still being developed to fix a few issues, mostly camera, and various bugs, and with a little time and work from the devs will be the ultimate rom for our phones, in my opinion.
Have you rooted your phone already?

No the phone has not been rooted yet, it is an insurance replacement and the methods for rooting three previous phone don't seem to work
Sent from my SGH-T959 using XDA

root & custom recovery
I followed this guide which worked as it should have:
http://forums.androidcentral.com/t-...t-recovery-rom-without-touching-computer.html
you will have to register to see the links, in my case it was worth it.
The custom recovery by drellisdee is the one that works right with an optimus t,
there are good guides here on xda too of course, just sharing what worked for me.

I'm looking for a stable rom with camera working and no major issues. btw im on old baseband

Got JellyBean for P509
hey man I don't know if you know this but there is a jellybean ROM from Rasheed on there. Let me try to link to you:
http://forum.xda-developers.com/showthread.php?t=1811325

Anything with Wifi Calling?
Any roms for Gingerbread or later with Wifi Calling?

I am using GingerSnap on my T-Mobile P509. Very nice so far.
Tiberius47 said:
Are roms for the optimus one compatible with the optimus t? I am interested in upgrading from stock to gingerbread or ice cream sandwich but I can't seem to find a straight answer anywhere online, including XDA...
Thanks in advance
Tiberius
Sent from my SGH-T959 using XDA
Click to expand...
Click to collapse

[Q] Lg Optimus t jb 4.1.2

Okay so this is my first post here, so let me know if this is posted in the right or wrong section. First of all I have an lg optimus t that is unlocked and that I use on AT&T at the moment. I am running a nightly cm7 rom with old baseband fix and everything runs perfectly fine. Just uesterday I tried to install rashed97's cm10 for p500 and everything worked except my network. Maybe you guys could suggest a rom that would work or know of a fix. Any help would be greatyl appreciated. By the way try to keep the answer simple as im sorta new to this stuff. Could someone answer quickly, I kinda wanted to get it up and running before I go back to school.

matt8998 said:
Okay so this is my first post here, so let me know if this is posted in the right or wrong section. First of all I have an lg optimus t that is unlocked and that I use on AT&T at the moment. I am running a nightly cm7 rom with old baseband fix and everything runs perfectly fine. Just uesterday I tried to install rashed97's cm10 for p500 and everything worked except my network. Maybe you guys could suggest a rom that would work or know of a fix. Any help would be greatyl appreciated. By the way try to keep the answer simple as im sorta new to this stuff. Could someone answer quickly, I kinda wanted to get it up and running before I go back to school.
Click to expand...
Click to collapse
You need to be on the new baseband to be able to have network capabilities if you flash an ICS or JB rom on to the p500. there is a thread somewhere that tells you how to do so.

a_loo said:
You need to be on the new baseband to be able to have network capabilities if you flash an ICS or JB rom on to the p500. there is a thread somewhere that tells you how to do so.
Click to expand...
Click to collapse
That's the thing it's a p500 rom and I'm not sure how to do so and if the new baseband will allow me to the access the network in my unique case. And isn't there a patch like a old baseband fix that will work I tried flashing the one I had but It didn't work.

Found it:
http://forum.xda-developers.com/showthread.php?t=1149530
Follow it carefully though, it's a hassle when you brick your phone.
After you get the new baseband on your phone, you should have network capabilities...if not, try reflashing rashed's rom after wiping everything.

a_loo said:
Found it:
http://forum.xda-developers.com/showthread.php?t=1149530
Follow it carefully though, it's a hassle when you brick your phone.
After you get the new baseband on your phone, you should have network capabilities...if not, try reflashing rashed's rom after wiping everything.
Click to expand...
Click to collapse
No don't... Just needs old baseband patch.
OldBB patch attached to this post. Flash via CWM after flashing ROM.
I wish y'all would stop pushing the use of KDZ. It's buggy software and the instructions leave a few things out. Things that will brick the device in question. There is always another way.

shinobisoft said:
No don't... Just need old baseband patch
Click to expand...
Click to collapse
Now I installed the p500 version not p509, so could you help me find a patch that works becuase I have looked and don't know how to navigate the forums just yet. I tried using my old one from cm7 and it got me stuck in a boot loop. Oops you did thanks but will that different p500 and p509 Roms make a difference. And will this work on a jb rom.

matt8998 said:
Now I installed the p500 version not p509, so could you help me find a patch that works becuase I have looked and don't know how to navigate the forums just yet. I tried using my old one from cm7 and it got me stuck in a boot loop.
Click to expand...
Click to collapse
I have a P509 too. I do the same thing for every ROM.
Since I am the maintainer of the FAQ's for the Optimus One devices, I will attach the Old baseband patch to the FAQ also

shinobisoft said:
I have a P509 too. I do the same thing for every ROM.
Since I am the maintainer of the FAQ's for the Optimus One devices, I will attach the Old baseband patch to the FAQ also
Click to expand...
Click to collapse
Im gonna try this one last time, hopefully it works. So will a p500 rom work with the p509 and the baseband patch.

shinobisoft said:
No don't... Just needs old baseband patch.
OldBB patch attached to this post. Flash via CWM after flashing ROM.
I wish y'all would stop pushing the use of KDZ. It's buggy software and the instructions leave a few things out. Things that will brick the device in question. There is always another way.
Click to expand...
Click to collapse
Sorry! It's just the way I did it, but I do realize there are better ways going about it. My bad.

matt8998 said:
Im gonna try this one last time, hopefully it works. So will a p500 rom work with the p509 and the baseband patch.
Click to expand...
Click to collapse
Yes. You'll be fine.

shinobisoft said:
Yes. You'll be fine.
Click to expand...
Click to collapse
It worked. Thanks you saved me a lot of trouble and searching through different forums.

matt8998 said:
It worked. Thanks you saved me a lot of trouble and searching through different forums.
Click to expand...
Click to collapse
Glad to help.

[Q] Thank You drastic00 + A 4G Question

Hello everyone,
After lurking for a week or two and finally building up the courage to modify my phone (Rogers LG Optimus 3D P925g) I have created an account and would like to join the community.
Unfortunately I cannot post on drastic00's Tutorial yet until I have 10 posts, so I'd like to personally thank him here. His guide was great, there were a few things I'd clarify on it from a Noob's perspective and if he's curious of my feedback, I'd be happy to share. (Guide: http://forum.xda-developers.com/showthread.php?t=2195753)
Now for my question:
My phone is now running XBSA ICS 3D ROM v7 with AC!D and I guess is on the V28b baseband from the guide.
Before I upgraded I was on android 2.3.5 but was also on the 4G network with Rogers.
With my new OS/ROM I'm now only on 3G and H network and do not know how to set it back to 4G. From everything I've learned I think this has to do with my Baseband/RIL to get back on 4G.
I read and went through this guide and there's another Windsor/Rogers guy, but none of his Baseband changes seemed to get a 4G network. Perhaps that post is too outdated for 4G?
Anyways, could anyone help me attempt to get back onto my old 4G network? Pointing me in the right direction would be great, I tried the forum search for topics on 4G or Rogers and it seemed a bit limited.
P.S. Please let me know if I broke any "Noob rules" because, well.... I am one, but would like to change that Have a wonderful day/night all!

Bump
I'd have better luck getting help in the Development guide. So until then I guess I need 10 posts.
At least I'll make use of these 10 posts and maybe help another complete noob by sharing my efforts:
Learning more about what 4G really is I found that it's actually HSPA+. Or just a better 3G that's been advertised wrong. Oh how annoyingly confusing... That means my old stock GB 2.3.5 showing "4G" must have actually just been HSPA+ since this p925g doesn't have LTE capabilities.
So on my preferred network I only have GSM option and no HSPA like I think I'm supposed to have.
My Mobile Network Type idles at UMTS:3 then bumps up to HSPA: 11 when I download. This can be seen in the About Phone under Status.
I shall try Backing up the current state and flashing different Basebands found in this post: http://forum.xda-developers.com/showthread.php?t=1974734
Again, any help or direction is greatly appreciated. Thank you.

Hi and welcome to the forum.
Since you've got the P925, and not the P920, you could try to search the forum for this phone instead. There is a complete section for P925.
For example, there is now an official ICS V30B ROM for P925, which is more recent than the ICS V28B ROM for P920. This ROM was already released for AT&T but according to many reports here, it works on other networks and even on P920 phone, and it has full 4G support.
Just search the forum, there are many threads and reports about this new ROM. For example:
The original thread with rom .kdz files: http://forum.xda-developers.com/showthread.php?t=2197191
Another thread with rom .bin files: http://forum.xda-developers.com/showthread.php?t=2198069
Members who report good 4G: Here, here, check the 4G icon here and for Canada here.
Just follow the guides for installing a .kdz ROM or the alternative guides for installing a .bin ROM and eventually you'll get 4G with the V30B ROM.

botson71 said:
Hi and welcome to the forum.
Since you've got the P925, and not the P920, you could try to search the forum for this phone instead. There is a complete section for P925.
For example, there is now an official ICS V30B ROM for P925, which is more recent than the ICS V28B ROM for P920. This ROM was already released for AT&T but according to many reports here, it works on other networks and even on P920 phone, and it has full 4G support.
Just search the forum, there are many threads and reports about this new ROM. For example:
The original thread with rom .kdz files: http://forum.xda-developers.com/showthread.php?t=2197191
Another thread with rom .bin files: http://forum.xda-developers.com/showthread.php?t=2198069
Members who report good 4G: Here, here, check the 4G icon here and for Canada here.
Just follow the guides for installing a .kdz ROM or the alternative guides for installing a .bin ROM and eventually you'll get 4G with the V30B
ROM.
Click to expand...
Click to collapse
bit OTT on the here parts

mut3d said:
bit OTT on the here parts
Click to expand...
Click to collapse
Would you like to elaborate on that?
The new member has the P925, lives in Canada, installed the v28b for P920 and doesn't have 4G now. With the v30b you could get 4G on P925 and P920 as well, as shown on the "here parts".
If you have any other information, perhaps you could post it here in order to help our new member.

Thank you very much!
botson71 said:
Hi and welcome to the forum.
Since you've got the P925, and not the P920, you could try to search the forum for this phone instead. There is a complete section for P925.
For example, there is now an official ICS V30B ROM for P925, which is more recent than the ICS V28B ROM for P920. This ROM was already released for AT&T but according to many reports here, it works on other networks and even on P920 phone, and it has full 4G support.
Just search the forum, there are many threads and reports about this new ROM. For example:
The original thread with rom .kdz files: http://forum.xda-developers.com/showthread.php?t=2197191
Another thread with rom .bin files: http://forum.xda-developers.com/showthread.php?t=2198069
Members who report good 4G: Here, here, check the 4G icon here and for Canada here.
Just follow the guides for installing a .kdz ROM or the alternative guides for installing a .bin ROM and eventually you'll get 4G with the V30B ROM.
Click to expand...
Click to collapse
I spent about 6 hours or so researching this V30b ROM since there's no "Total Noob guide" for it haha.
I'm going to go for it, I'll try Xbsall's custom ROM that the Canadian user Goldenmeadow has had luck on it.
If I brick it, I've done enough research to be confident that I can fix it.
Also, boston71, your help was clear, kind and very informative. I actually thought the P925g was just the Canadian version of the P920 with french support. I appreciate your help a lot and wish I could hit Thanks more. I'm curious to know how you easily searched the forum for those single posts? Is there some sort of advanced search trick I'm missing? I get too many results that are just threads and not single posts, then I have to Ctrl + F on each thread page...
Cheers mate!

CaulkOnMyWaffles said:
I spent about 6 hours or so researching this V30b ROM since there's no "Total Noob guide" for it haha.
I'm going to go for it, I'll try Xbsall's custom ROM that the Canadian user Goldenmeadow has had luck on it.
If I brick it, I've done enough research to be confident that I can fix it.
Also, boston71, your help was clear, kind and very informative. I actually thought the P925g was just the Canadian version of the P920 with french support. I appreciate your help a lot and wish I could hit Thanks more. I'm curious to know how you easily searched the forum for those single posts? Is there some sort of advanced search trick I'm missing? I get too many results that are just threads and not single posts, then I have to Ctrl + F on each thread page...
Cheers mate!
Click to expand...
Click to collapse
Thanks for your nice words.
I would suggest not to install a custom ROM but first the v30b stock ROM after downloading its .kdz or .bin files which I linked on my previous post.
You've already succeeded flashing a .bin ROM following the guide from your first post, so you are familiar with that.
You could also try flashing the .kdz ROM following the guide at the sticky thread here (only the Step 1 is needed). The advantages of this method are that is simpler and faster than the first one, and most importantly, is safer than the first one (for example many people are losing their IMEI when flashing .bin files).
I don't know about the Canadian P925g version, perhaps some Canadian member could help. I don't even own the P925 American version, only the European P920 one. But since you introduced yourself so nicely and no one answered your posts for half a day, I decided to answer with the (little) I know about the v30b.
No, I didn't use any trick for searching the forum. But since the V30B is very new rom, there are very few threads and posts about it. I just went to the threads and searched with Ctrl + F about the "4G"

botson71 said:
Thanks for your nice words.
I would suggest not to install a custom ROM but first the v30b stock ROM after downloading its .kdz or .bin files which I linked on my previous post.
You've already succeeded flashing a .bin ROM following the guide from your first post, so you are familiar with that.
You could also try flashing the .kdz ROM following the guide at the sticky thread here (only the Step 1 is needed). The advantages of this method are that is simpler and faster than the first one, and most importantly, is safer than the first one (for example many people are losing their IMEI when flashing .bin files).
I don't know about the Canadian P925g version, perhaps some Canadian member could help. I don't even own the P925 American version, only the European P920 one. But since you introduced yourself so nicely and no one answered your posts for half a day, I decided to answer with the (little) I know about the v30b.
No, I didn't use any trick for searching the forum. But since the V30B is very new rom, there are very few threads and posts about it. I just went to the threads and searched with Ctrl + F about the "4G"
Click to expand...
Click to collapse
Good job boston
Keep up helping
Thanks
Sent from my LG-P920

Ok, finally I can help somebody and share the pain I went through
OP, you are absilutely right - 4G and H are the same!
Long time ago, when we got gingerbread update, my phone was showing 4G all the time. Then some member made nice fix and my phone was showing ACTUAL connection speed - 3G or H.
Now with ICS it's back to just 4G... And it doesn't matter if you are on stock or american version of xbsa.
But you put v28 which is european. And that version, I imagine, distinguishing between 3G and H.
Then. There is hidden menu. You dial 3845#*925#. In there it used to be section where you could force your phone into specified band. But now it's gone. Still there is MODEM SETTINGS -> ENGINEERING MODE. There you can see actual band you are on.
And now I share information that I was digging for looong time:
Rogers uses two frequencies in two formats:
GSM850
GSM1900
WCDMA850 - called WCDMA_V
WCDMA1900 - called WCDMA_II
In GSM you can get only Edge (2G). Usually 1900 in big cities and 850 in country.
WCDMA gives you 3G/H:
UMTS:3 is 3G
HSPA:9 is H
HSDPA:11 is upper H
(sorry, I don't remember exact abbreviations).
Here is little discussion you might find interesting:
http://forum.xda-developers.com/showthread.php?t=1380357
To save battery phone stays in 3G mode (UMTS) until you start transmit/receive data. Then it jumps to H.
But lazy (or crooked) guys at Rogers and AT&T decided to show 4G all the time (because it's Thrill 4G? ). And it's confusing...
It took me long time to figure out.
Glad you took courage to upgrade!
Congrats!
Sent from my LG-P925 using xda app-developers app

Thank you Goldenmeadow & Boston71
Thanks boston71! I'll try the V30b. I figure if I somehow brick my phone or really mess it up, I'll get it back to normal somehow. I don't see a thread about someone being bricked and then they actually use their phone as a brick since it's unsolvable
Goldenmeadow said:
Ok, finally I can help somebody and share the pain I went through
OP, you are absilutely right - 4G and H are the same!
Long time ago, when we got gingerbread update, my phone was showing 4G all the time. Then some member made nice fix and my phone was showing ACTUAL connection speed - 3G or H.
Now with ICS it's back to just 4G... And it doesn't matter if you are on stock or american version of xbsa.
But you put v28 which is european. And that version, I imagine, distinguishing between 3G and H.
Then. There is hidden menu. You dial 3845#*925#. In there it used to be section where you could force your phone into specified band. But now it's gone. Still there is MODEM SETTINGS -> ENGINEERING MODE. There you can see actual band you are on.
And now I share information that I was digging for looong time:
Rogers uses two frequencies in two formats:
GSM850
GSM1900
WCDMA850 - called WCDMA_V
WCDMA1900 - called WCDMA_II
In GSM you can get only Edge (2G). Usually 1900 in big cities and 850 in country.
WCDMA gives you 3G/H:
UMTS:3 is 3G
HSPA:9 is H
HSDPA:11 is upper H
(sorry, I don't remember exact abbreviations).
Here is little discussion you might find interesting:
http://forum.xda-developers.com/showthread.php?t=1380357
To save battery phone stays in 3G mode (UMTS) until you start transmit/receive data. Then it jumps to H.
But lazy (or crooked) guys at Rogers and AT&T decided to show 4G all the time (because it's Thrill 4G? ). And it's confusing...
It took me long time to figure out.
Glad you took courage to upgrade!
Congrats!
Sent from my LG-P925 using xda app-developers app
Click to expand...
Click to collapse
That was a very interesting thread, thank you for sharing it. I wish they'd make it all one standard for the levels of connection!
That Rogers information would explain why I only have the option to pick from GSM or WCDMA. But then it doesn't explain why my father's Galaxy S3 has a HSPA/LTE option.... Maybe it's just the phone or something, I'm not sure.
I'll try the V30b even if it seems I'd be okay with what I got. I am just really enjoying this stuff
Thank you so much for your help, greatly greatly appreciated!
Edit after a re-read: Lol, I want to hit more Thanks buttons since your post was just so much awesome information summarized in such a simple and understandable way. Go! Spread your knowledge! You're good at it!

I know its been said but the O3D is not a 4G phone, despite the Yank version name.
I have had a play today with basebands and 28b/30b ROMs. If you are on xbsav7 you are probably better off staying on it and just flashing the 30b baseband with LG Flashtool.
Switching to the correct baseband increased my data speed by about double. Install Speed Test to check for yourself.
Sent from my LG-P920 using xda app-developers app

CaulkOnMyWaffles said:
But then it doesn't explain why my father's Galaxy S3 has a HSPA/LTE option.... Maybe it's just the phone or something, I'm not sure.
I'll try the V30b even if it seems I'd be okay with what I got. I am just really enjoying this stuff
Thank you so much for your help, greatly greatly appreciated!
Edit after a re-read: Lol, I want to hit more Thanks buttons since your post was just so much awesome information summarized in such a simple and understandable way. Go! Spread your knowledge! You're good at it!
Click to expand...
Click to collapse
It explains everything Sammy G3 DOES have LTE mode (real 4G) that our 3D lacks... But don't forget, our LG is couple years older
And believe me, I found all this info not just for fun. My first phone was LG Optimus 2x - I got from friend who bought it in Europe. So I had 3G in Kitchener but only Edge (2G) in Woodstock... It was driving me crazy till I found about bands. So that phone had GSM850/1900 but only CDMA1900. That is why in "rural" town I didn't have 3G... So I got rid of that model and bought 3D on kijiji
And like LeighR said - try different basebands and do speed test. Before this one I used v20c. Actually I'm still testing this v30b baseband, may be I'll go back...

V20C
Goldenmeadow said:
It explains everything Sammy G3 DOES have LTE mode (real 4G) that our 3D lacks... But don't forget, our LG is couple years older
And believe me, I found all this info not just for fun. My first phone was LG Optimus 2x - I got from friend who bought it in Europe. So I had 3G in Kitchener but only Edge (2G) in Woodstock... It was driving me crazy till I found about bands. So that phone had GSM850/1900 but only CDMA1900. That is why in "rural" town I didn't have 3G... So I got rid of that model and bought 3D on kijiji
And like LeighR said - try different basebands and do speed test. Before this one I used v20c. Actually I'm still testing this v30b baseband, may be I'll go back...
Click to expand...
Click to collapse
I've been PMing a fellow Rogers + Windsor Ontario user. He's very kind and has told me V20C has worked wonders for him. That's what I'll try flashing tonight.
With V30B I'm just getting 2-3MB/s on speedtest with 3-4 bars signal.
He's telling me he gets 8-10MB/s. I guess I'll have to try 'er out.
LeighR said:
I know its been said but the O3D is not a 4G phone, despite the Yank version name.
I have had a play today with basebands and 28b/30b ROMs. If you are on xbsav7 you are probably better off staying on it and just flashing the 30b baseband with LG Flashtool.
Switching to the correct baseband increased my data speed by about double. Install Speed Test to check for yourself.
Sent from my LG-P920 using xda app-developers app
Click to expand...
Click to collapse
I was going to try the V28b Large partitions then his custom V30B rom then flash bandbase V20c. I figure if I brick my phone that it's a good lesson
I'm on stock V30b ICS from AT&T right now. There's way too much bloatware.
Thanks to both of ya!

Don't forget to apply fix for metallic voice after you flash v20c!
And yes, I think I noticed drop in speed too... Gonna try v20c this weekend.
Also thinking about switching to xbsa 7.2 only because it's nice to have his support - I've been on his ported ICS for couple months now and happy.
Sent from my LG-P925 using xda app-developers app

D850 w/ T-Mobile sim AOSP KERNEL PANIC LTE

I've been asking around a lot about this and really haven't gotten anywhere. Jist of it is that when using AT&T LG G3 with a T-Mobile sim running AOSP roms i get kernel panics while using LTE. It's fine and dandy with stock based roms. I don't like stock so please don't tell me to do that. Here is a last-kmsg I've pulled after my latest kernel panic. I mainly run Androiduser00110001 cm12. EVERY AOSP rom causes it but I've found when i run his 12.11 build they come far and few. Like once or twice a day. Compared to every time i start using data otherwise. I asked androiduser00110001 what was different about that build but still haven't heard back from him don't plan on it either he's a very busy dev. It's bearable now with this build. If i flash a newer one I'm screwed. I've tried. I've tried every AOSP rom for our device. Please don't tell me to get a T-Mobile variant or get att service please. Some people here have been very dickish about it. Not going to mention any names. I'm just looking to see if anyone can look into the logs i post here. One more thing, this does not happen with att sim. Thank you.

I can't offer you much help, but I can tell you that my D850 unlocked and being used on T-Mobile doesn't have this problem. One issue I encountered with one of the cm12 based roms was it would keep losing the APNs.
I can only suggest doing an Advanced wipe in twrp on everything except your external Sd card and starting from scratch.

[Q] "Not Registered" Error - Can't Update

Before I begin, I'd just like to say that I've reviewed numerous threads regarding this topic, both here and on other forums, and I have yet to find a single conclusive solution to my issue, which is why I'm posting.
I recently purchased an AT&T D800 G2 off the internet because I was informed AT&T uses the same frequencies as Canada's Telus. This is true, and the D800 runs on my Telus frequencies with 4G and 3G HSPA, but I found one annoying niggle (besides all the useless AT&T Bloatware that I can't remove), and that's the fact that I can't update my software.
Namely, it's the infamous "Not Registered" issue that the D800 gives me whenever I try to update. I've tried several fixes, but none have really helped me. I'm still running 4.2.2 JellyBean, Software Version D80010o. IIRC, latest JellyBean version is D80010q, so that means I'm not even running the latest JellyBean version.
I've read about one fix that I have not yet tried, and that is to use an Active AT&T Sim to try and allow it to update, since AT&T pushes out their own updates to devices on their network. Since I live in Canada and AT&T doesn't exist up here in the North, I was contemplating getting a GoPhone Sim (Their Prepaid division?) off eBay and using that just to get the Update. Would that work?
And if not, are there any ways of getting KitKat, and, later down the road, Lollipop without going down the Root path?
Thanks in advance, guys.

I don't know how to fix the ota issue, but you could get it on kitkat by searching for the d80020c tot file on xda and flash it with the lg flash tool. Just take the sim out during this process, I've done this and killed my sim.

Huh, okay.
I've definitely seen some threads that recommend flashing a new ROM.
The thing is (newb question)I rather like the LG Optimus UI and I'm not sure if flashing these things would revert me to vanilla android. Would it? I have no experience and since I don't have a warranty I guess I could try root if it would help.

No, it would install the kit Kat firmware provided by AT&T.
Sent from my LG-D800 using XDA Free mobile app

Awesome.
I'm just glad there's a way to bypass OTA issued by At&t.
Thanks for all your help!
P.S. Would flashing the ROM void warranty?