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How do you Downgrade G2x Baseband

My friend had a g2x and he is running Ricardo's selfkang ics builds. But everything works for him except text messaging. He can send texts with no problem but he is not receiving the messages back.
His baseband is build from July and mine is from march. Maybe its a base and issue, and I want to know where can I get the old March 2011 base and and how do I downgrade his baseband
Sent from my LG-P999 using Tapatalk 2 Beta-5

So far, the P999/G2X baseband is not flashable separately from the rest of the firmware and operating system and don't use the flashing utility for the P990/Optimus 2X to flash the Optimus 2X baseband because it will ruin the P999/G2X so that the phone won't be usable as a phone anymore.

Im having the same issue, still haven't found a way around it. I made a thread http://forum.xda-developers.com/showthread.php?t=1577242

Tell your friend to try a different rom. The Cm9 build is only beta and not everything is working properly
If he wants to stay on ICS roms, have him try Hells or EB or AOK ics roms and see what results he gets
Sent from my LG-P999 using xda premium

Bump
Sent from my LG-P999 using Tapatalk 2

SMS
Read thread http://forum.xda-developers.com/showthread.php?t=1577242 It is not a baseband issue, it appears to be an anomaly with certain phones, I have personally experienced it on 2 handsets of the 10 I have used.

Have you tried using the getril app in the play store. It may be an issue because his baseband and ril are not matching. I have no problems sending or receiving anything on ics with July baseband.

Caliyork said:
Have you tried using the getril app in the play store. It may be an issue because his baseband and ril are not matching. I have no problems sending or receiving anything on ics with July baseband.
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Yep we have tried that to no avail. Do anyone have the march 2011 kdz file?
Sent from my LG-P999 using Tapatalk 2

mustangtim49 said:
Check this out http://www.acsyndicate.net/attention-g2x-owners-p999-v21y-update-available/
[email protected]
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Uhhh I'm looking for march 2011 baseband not march 2012 one.
Also march 2012 one won't work on roms
Sent from my LG-P999 using Tapatalk 2

k7raid said:
Read thread http://forum.xda-developers.com/showthread.php?t=1577242 It is not a baseband issue, it appears to be an anomaly with certain phones, I have personally experienced it on 2 handsets of the 10 I have used.
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He seems to be ignoring the actual answers that it isn't the baseband, it's either the ROM or the phone
Sent from Narnia

ayysir said:
My friend had a g2x and he is running Ricardo's selfkang ics builds. But everything works for him except text messaging. He can send texts with no problem but he is not receiving the messages back.
His baseband is build from July and mine is from march. Maybe its a base and issue, and I want to know where can I get the old March 2011 base and and how do I downgrade his baseband
Sent from my LG-P999 using Tapatalk 2 Beta-5
Click to expand...
Click to collapse
Looking to downgrade as well from v21y back to what I had. I need voice calls and stock simply doesn't work right for me.
Sent from my LG-P999 using xda premium

ayysir said:
Uhhh I'm looking for march 2011 baseband not march 2012 one.
Also march 2012 one won't work on roms
Sent from my LG-P999 using Tapatalk 2
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My bad bro. Sorry. Yeah, I actually bought a G2x with that old baseband, without thinking flashed right over it. I'm sure there's a thread in here somewhere with it. Please excuse my link, I'm a starving journalist.
[email protected]

Please help calling issues after OTA V21y update from LG
I flashed everything back to Stock did OTA update everything works fine on Stock ROM, when I flash any non stock Rom when I try to make calls get a bad static clicking issue tried CM9 and stable CM7 and EB. Tried getril said versions did not match got them to match and still having issues. Anyone seen this before I am stuck on the stock ROM and cannot flash anything due to not being able to make calls.
I think it might have been the BaseBand update that broke it I am currently running M6600A-SCAUTNZ-2.0.9720T 1 [MAR 11 2012 10:00:00] MP: TRULGE_08.09.02R_MDM Please help want to be able to use custom ROMS again.

TeamZx3 said:
I flashed everything back to Stock did OTA update everything works fine on Stock ROM, when I flash any non stock Rom when I try to make calls get a bad static clicking issue tried CM9 and stable CM7 and EB. Tried getril said versions did not match got them to match and still having issues. Anyone seen this before I am stuck on the stock ROM and cannot flash anything due to not being able to make calls.
I think it might have been the BaseBand update that broke it I am currently running M6600A-SCAUTNZ-2.0.9720T 1 [MAR 11 2012 10:00:00] MP: TRULGE_08.09.02R_MDM Please help want to be able to use custom ROMS again.
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Please read any of dozens of posts that would inform you of the fact that the new baseband is currently incompatible with anything not based on the new stock ROM.
Sent from my Motorola StarTAC

It's actually really easy to downgrade. I upgraded yesterday using mode XP and then realized I couldn't use CM7 Roms without in-call audio acting up. I just did the same procedure again but used the 'V21E_00.kdz' flash file. Its the update file that has the July 2011 baseband. It worked perfectly under Mode XP using the offline updater tool.
Give it a try. Hope this helps

ergibson83 said:
It's actually really easy to downgrade. I upgraded yesterday using mode XP and then realized I couldn't use CM7 Roms without in-call audio acting up. I just did the same procedure again but used the 'V21E_00.kdz' flash file. Its the update file that has the July 2011 baseband. It worked perfectly under Mode XP using the offline updater tool.
Give it a try. Hope this helps
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Click to collapse
Want the march 2011 baseband not July 2011.....I give up
Sent from my LG-P999 using Tapatalk 2

baseband
how do i downgrade back to froyo using stock rom
cant make calls just sounds messsed up
lg g2x updated to 2 2.3.3 worked on 2.3.2 then updated ota then started having the call issue please help me

Go to g2x Dev section. Stickied thread on how to unbrick.
Flash stock recovery with nvflash.
Then using windows XP, plug your phone in, install the msxml file. Then run tthe kdz updater. Browse to the v21e kdz and launch the application.
Here's some tips. It would seem like it freezes, but just wait. Its actually running. Just don't touch the computer for a while.
Sent from my LG-P999 using XDA

does it work for windows 7 and how i run the kdz updater im relly new to this i have never flashed a lg baseband before
---------- Post added at 04:26 AM ---------- Previous post was at 04:15 AM ----------
dude

TeamZx3 said:
I flashed everything back to Stock did OTA update everything works fine on Stock ROM, when I flash any non stock Rom when I try to make calls get a bad static clicking issue tried CM9 and stable CM7 and EB. Tried getril said versions did not match got them to match and still having issues. Anyone seen this before I am stuck on the stock ROM and cannot flash anything due to not being able to make calls.
I think it might have been the BaseBand update that broke it I am currently running M6600A-SCAUTNZ-2.0.9720T 1 [MAR 11 2012 10:00:00] MP: TRULGE_08.09.02R_MDM Please help want to be able to use custom ROMS again.
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Click to collapse
I have this same static issue. I can send/receive texts and make/accept calls, the problem is though that calls is all static, I can't hear anything else. I have the same BB you do as well. Currently running JB 4.1.1 on CM9 (9.9.9-JB-p999). It would be REALLY nice to keep this rom, it performs so much better than the other ROMs I have tried :crying:

[Q] hellfire sandwich calling

hi i just got hellfire sandwich and anytime i make a call it has this noise and i cant hear anything and the person on the other side cant either. any idea?

You probably have the March 2012 baseband installed...ever install the v21y update?
Someone correct me but I don't think HFS works with the new baseband...
Sent from my LG-P999 using Tapatalk 2

You are correct DJ. Both HFS, and HFP are not currently compatible with the March 2012 BB (v21y).

New2my8125 said:
You are correct DJ. Both HFS, and HFP are not currently compatible with the March 2012 BB (v21y).
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Click to collapse
And I've read they have no plans to update, at least hfp doesn't. Which is a bummer.
Sent from my LG-P999 using xda premium

djvoleur said:
You probably have the March 2012 baseband installed...ever install the v21y update?
Someone correct me but I don't think HFS works with the new baseband...
Sent from my LG-P999 using Tapatalk 2
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how do you update this? to v21y?

mrconnections said:
how do you update this? to v21y?
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Click to collapse
Try this.
http://forum.xda-developers.com/showthread.php?t=1696266

you can use Owains BB update zip file, flash it in CWM like you would a ROM and it adds support for the new BB to any ROM
http://owain.hopto.org/T-Mobile LG G2x (p999)/Domination/new_baseband.zip

[Q] Loud distortion sound when making phone calls

I have just received ANOTHER refurbished G2x from T-mobile because I thought there was an issue with my other phone but it seems as though my problem is consistent with both devices...
When first using my phone, all works fine. However after I rooted it, I tried installing MUIU, and Hellfire (ICS) and when trying to make a call on both of these rooted ROMs, I get this loud, distorted sound along with no transmission between my phone and anyone I call. Has anyone else come across this issue? what am I missing?
Thanks for the help!

Wrong baseband for those roms you need to use the new baseband zip from owains thread in his O.P.
Try searching around a little next time you'd find your answer easily.
Sent from my LG-P999 using xda premium

so i just flash the new baseband zip after flashing a new rom?

shortkidd96 said:
so i just flash the new baseband zip after flashing a new rom?
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Yes
Sent from my LG-P999

I get the same exact problem as the OP only difference is I have been on the new baseband 21y for like a month now I have even checked in my system info and Getril just to make sure it's sticking and it is.
Got it working, for some reason I had to reflash the baseband *shrug*

williams2917 said:
I have just received ANOTHER refurbished G2x from T-mobile because I thought there was an issue with my other phone but it seems as though my problem is consistent with both devices...
When first using my phone, all works fine. However after I rooted it, I tried installing MUIU, and Hellfire (ICS) and when trying to make a call on both of these rooted ROMs, I get this loud, distorted sound along with no transmission between my phone and anyone I call. Has anyone else come across this issue? what am I missing?
Thanks for the help!
Click to expand...
Click to collapse
The V21y baseband from March 2012 is not compatible with many custom roms outside of Nightly. There is a V21y baseband fix for your audio from Owain but calls via bluetooth won't work anymore.
My solution has been to install the rooted V21y stock rom and then customize it from there. Everything works that way and there are no issues at all.

I tried everything here but no luck. Does anyone have the baseband zip so I can flash it? I searched and can't seem to find it,

bassam3000 said:
I tried everything here but no luck. Does anyone have the baseband zip so I can flash it? I searched and can't seem to find it,
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Click to collapse
Here you go http://db.tt/fC1QynNS
Sent from my LG-G2x using Tapatalk 2

SO I just go into CWM and flash it?

bassam3000 said:
SO I just go into CWM and flash it?
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Click to collapse
That's it no need to wipe or anything
Sent from my LG-G2x using Tapatalk 2

Thanks sooo much it works now! If I flash a new ROM do I need to reflash the new baseband zip?

bassam3000 said:
Thanks sooo much it works now! If I flash a new ROM do I need to reflash the new baseband zip?
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Yea you still have to flash it unless it's compatible with 21y
Sent from my LG-G2x using Tapatalk 2

g2x hellfire 1.9 no sound in call

I switched from eagles blood 5 to hellfire 1.9 and I cant get my call audio to work I cant hear the ring voices nothing its just silent can somebody tell me whats wrong please!!

Did you update your baseband to March 2012?
Sent from my LG-P999 using xda app-developers app

umm I think I havent updated my baseband ever since I got the phone but how would I update it to the right one ? its good to know that its not the rom its just the baseband I just need to figure out how to update thanks

Tak23 said:
umm I think I havent updated my baseband ever since I got the phone but how would I update it to the right one ? its good to know that its not the rom its just the baseband I just need to figure out how to update thanks
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If you look under the the big Hellfire Sandwich v1.9. there is a download link for the old baseband if you dont want to take the leap to upgrading your baseband.
But if you want to update your baseband look in the general section you should be able to find what your looking for to upgrade your baseband. I'd post a link but i havnt got my 10 posts yet.

yeah I think im gonna upgrade the baseband from what I'm told baseband matters a lot. I take it I have to install a stock rom and in the process it will unroot my phone but I just root it back thanks man you been a great help.

I dont know if you want to use this guide, but this is the only way I could get the 21y firmware and march 2012 baseband on my wind mobile p999 phone.
Just search
[GUIDE] solution to unbrick, unknown baseband, dead phone, boot loop etc
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Click to collapse
in G2x General and i just followed from the 1st step, even though my phone already had a rom and baseband on it. Hope everything goes smooth for you.

[Q] No 3g After Installing Thiaiz

I installed v21e baseband and Thiaiz over the weekend and I'm really enjoying it, however for some reason I cannot get any 3g connection. My data does work it's just only e or g connection no 3g.

So I reinstalled the official GB update and still have no 3g connection. I believe the problem is with the V21e baseband and not the rom. 3g has not worked since installing V21e on my Rogers LG925. Is there a radio update for Rogers phones? With the Rogers release of GB the ghost calls are brutal so I would rather not go back to using the GB software from Rogers.
I found this thread in the LG Thrill section looks like this user is having the exact same issue.
Any ideas?

n3fta said:
So I reinstalled the official GB update and still have no 3g connection. I believe the problem is with the V21e baseband and not the rom. 3g has not worked since installing V21e on my Rogers LG925. Is there a radio update for Rogers phones? With the Rogers release of GB the ghost calls are brutal so I would rather not go back to using the GB software from Rogers.
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Click to collapse
Try stock 20c for signal then try one of Prometheus kernels as samno put a ghost call patch in all his newer kernels I believe anyways somebody please correct me if I am wrong
Sent from my LG-P920 using xda app-developers app

wayno140 said:
Try stock 20c for signal then try one of Prometheus kernels as samno put a ghost call patch in all his newer kernels I believe anyways somebody please correct me if I am wrong
Sent from my LG-P920 using xda app-developers app
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Thanks I will give this a try.

were are you?
n3fta said:
I installed v21e baseband and Thiaiz over the weekend and I'm really enjoying it, however for some reason I cannot get any 3g connection. My data does work it's just only e or g connection no 3g.
Click to expand...
Click to collapse
Were are you?
I had the same problems with v21e in canada
went back to v20, flashe dpromethius and bluekernel.
That combination fixed my GC and battery issues

have same problem after flashing to V21E to fix up the GC issue (finally got it to work!!)
any advices?

need help please on that one