How do you Downgrade G2x Baseband - T-Mobile LG G2x

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.
Click to expand...
Click to collapse
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]
Click to expand...
Click to collapse
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.
Click to expand...
Click to collapse
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
Click to expand...
Click to collapse
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.
Click to expand...
Click to collapse
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
Click to expand...
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.
Click to expand...
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:

Related

Videotron branded V21D_00.01 original firmware from LG available here

The Videotron branded V21D_00.01 original firmware from LG is available here:
http://csmg.lgmobile.com:9002/swdata/WEBSW/LGP999/AAVCDW/V21D_00.01/V21D_00.01.kdz
It is not an update to Gingerbread, it is the original Videotron firmware which is Android 2.2.2 (FROYO) which includes a patch to fix problems with SMS messaging.
As in our major problem? You were one of them correct?
Sent from my LG-P999 using xda premium
mt3g said:
As in our major problem? You were one of them correct?
Sent from my LG-P999 using xda premium
Click to expand...
Click to collapse
I don't understand your comment, explain.
Never mind lol, mistake. I thought you were someone else....
Sent from my LG-P999 using xda premium
Man, you go right after them like I do.
Sent from my LG-P999 using xda premium
Thank you for this file. I tried ICS, but I can't manage to receive voicemail notifications, which is pretty annoying. And the carrier name shows "Vid otron". It seems that the ICS notification bar font doesn't support "é" characters. It's kind of weird...
Hey, this is something i've been looking for. Could ya tell me which baseband it upgrades the phone to? Thanks
shikogi said:
hey, this is something i've been looking for. Could ya tell me which baseband it upgrades the phone to? Thanks
Click to expand...
Click to collapse
m6600a-scautnz-2.0.9720t 1 [oct 24 2011 10:00:00]
kevint27 said:
Thank you for this file. I tried ICS, but I can't manage to receive voicemail notifications, which is pretty annoying. And the carrier name shows "Vid otron". It seems that the ICS notification bar font doesn't support "é" characters. It's kind of weird...
Click to expand...
Click to collapse
You need La crème glacée sandwich version.
Core Memory said:
The Videotron branded V21D_00.01 original firmware from LG is available here:
[...
It is not an update to Gingerbread, it is the original Videotron firmware which is Android 2.2.2 (FROYO) which includes a patch to fix problems with SMS messaging.
Click to expand...
Click to collapse
I was able to flash it to my t-mobile branded G2x and it updated the baseband
I forgot how snappy this thing was since I've started using ICS roms.
Thanks!
adampk said:
I was able to flash it to my t-mobile branded G2x and it updated the baseband
I forgot how snappy this thing was since I've started using ICS roms.
Thanks!
Click to expand...
Click to collapse
Updated the baseband how? Wrote that really quick meant like in what way, what baseband were you on and what are you on now? Sorry for any confusions.
Sent from my LG-P999 using xda premium
mt3g said:
Updated the baseband how? Wrote that really quick meant like in what way, what baseband were you on and what are you on now? Sorry for any confusions.
While on XP I've used that .kdz file with the flasher/updater from KDZ_FW_UPD_EN.7z to flash my secondary G2x, you also need to have the APX driver installed from One-Click-G2x-recovery-flasher-06-16.rar. I've also reverted back to the original recovery before attempting the kdz flash. Once done with it, I had the Videotron branded android and the baseband with OCT 24 2011 date. I tried a simple mobile sim card with it. After adding an APN, the data seemed to work. I was able to receive a call from my other phone. Then, I've flashed the CM recovery (as it was back to stock) using nvflash and then from the CM recovery I've flashed Owain's ICS on it.
I also have a copy of the files that .kdz unpacked (though I'm not sure if its complete).
That's about it.
Oh, yeah, before I had JUL 15 2011 baseband after the GB upgrade.
Also take a look at this thread... http://forum.xda-developers.com/showthread.php?t=1180331
To use the KDZ_FW_UPD you need to disconnect the phone from usb, remove the battery, hold the Vol down button while plugging-in the USB cable. This will force the S/W Update screen on the phone, and the tool will work.
I also reflashed V21E_00.01.kdz with that KDZ_FW_UPD tool and the baseband went back to JUL 15 2011.
Awesome!
Click to expand...
Click to collapse
Nice. Gonna have to dig through this.
Sent from my Galaxy Nexus using xda premium
Just to simplify things, the thread I've pointe to has all the tools/drivers. But it is a bit murky about the flashing process.
As long as you are on the stock recovery, it should be possible to just remove the battery, unplug the usb, push and hold Vol down and plug back the usb. At that point the S/W Upgrade screen should show up and KDZ_FW_UPD tool should be able to pick up your phone and apply the .kdz
Sweet hopefully it place nice with T-Mobile apn's... will probably give this a go on Sunday.
Sent from my LG-P999 using xda premium
mt3g said:
Sweet hopefully it place nice with T-Mobile apn's... will probably give this a go on Sunday.
Sent from my LG-P999 using xda premium
Click to expand...
Click to collapse
Before flashing do a backup with CWM. Then flash the Videotron KDZ file. After verifying if the SMS issue is fixed you can reflash CWM and then flash back the CWM backup to got back to T-Mobile Gingerbread. No reason to reflash a KDZ as this is the latest baseband available for the P999. I might do it to mine just to get the new baseband. I moved on to another phone due to band issues (needed 850 3G support for a carrier here in Thailand) but I have not gotten around to selling my G2X yet.
You saying to do a backup of any rom or flash back to 2.3.3 ota version? I assume any rom, which isn't an issue as I have about 10 on my PC lol...
Sent from my LG-P999 using xda premium
mt3g said:
You saying to do a backup of any rom or flash back to 2.3.3 ota version? I assume any rom, which isn't an issue as I have about 10 on my PC lol...
Sent from my LG-P999 using xda premium
Click to expand...
Click to collapse
Whatver your current rom is if you want to go back to your phone how it is. The sms problem is not in the rom so restoring the rom won't change anything if updating with the patched baseband fixes the issue. All you care about is getting the new baseband. Up to you if you want to restore current rom or flash something else.
Core Memory said:
You need La crème glacée sandwich version.
Click to expand...
Click to collapse
LOL!
jboxer said:
Whatver your current rom is if you want to go back to your phone how it is. The sms problem is not in the rom so restoring the rom won't change anything if updating with the patched baseband fixes the issue. All you care about is getting the new baseband. Up to you if you want to restore current rom or flash something else.
Click to expand...
Click to collapse
Okay I figured that much... I don't really care about restoring so much cause I don't do any super customizations to my phone and only use 10ish applications and no games to worry about save points.
Sent from my LG-P999 using xda premium

[Q]How do I baseband?

I'm sorry. I've tried searching the forum and I can't seem find the following:
Where to download the March 2012 baseband
How to install said baseband
Problems with said baseband and if it's worth installing it if trying to flash a rom that says "March 2012 baseband required"
Please help! Thanks!
Your searching is terrible lol, there is no flashing the baseband you have get the whole rom v21y "upgrade" and then you will have 2.3.4 with March 2012 baseband.
There is a post 2 below yours that has info peoples thoughts on the new baseband as well. You failed hahaha.
Sent from my LG-P999 using xda premium
mt3g said:
you have get the whole rom v21y "upgrade" and then you will have 2.3.4 with March 2012 baseband
Sent from my LG-P999 using xda premium
Click to expand...
Click to collapse
This is why I'm confused. http://forum.xda-developers.com/showthread.php?t=1602798 This rom says that it IS the v21y upgrade, but that I still need the March 2012 baseband
It is the update, you can't flash a baseband on the g2x, you need to get the update via OTA or LG tool.
Sent from my LG-P999 using xda premium
where the easy step to get the 2012 baseband?
chipis said:
where the easy step to get the 2012 baseband?
Click to expand...
Click to collapse
Here you go
http://forum.xda-developers.com/showthread.php?t=1610597
Make sure you are using win7 32bit OS or XP 32bit OS. Good luck
ratza66 said:
Here you go
http://forum.xda-developers.com/showthread.php?t=1610597
Make sure you are using win7 32bit OS or XP 32bit OS. Good luck
Click to expand...
Click to collapse
Why does it have to be 32 bit?
Sent by G2x
It doesn't.
Sent from my LG-P999 using XDA
ratza66 said:
Here you go
http://forum.xda-developers.com/showthread.php?t=1610597
Make sure you are using win7 32bit OS or XP 32bit OS. Good luck
Click to expand...
Click to collapse
This base band applies to any rom or just the this ?
Sent from my LG-P999 using XDA Premium App
chipis said:
This base band applies to any rom or just the this ?
Sent from my LG-P999 using XDA Premium App
Click to expand...
Click to collapse
It works with the link provided in the 3rd post of this thread only or the stock unrooted rom it comes with.
chipis said:
This base band applies to any rom or just the this ?
Sent from my LG-P999 using XDA Premium App
Click to expand...
Click to collapse
It doesnt apply to any rom. It only applies to roms that has been built with the baseband. If you update your baseband and try to install an ICS/gingerbread rom thats not made on that baseband, you will get static sound when trying to make a call
Chinese281 said:
It doesnt apply to any rom. It only applies to roms that has been built with the baseband. If you update your baseband and try to install an ICS/gingerbread rom thats not made on that baseband, you will get static sound when trying to make a call
Click to expand...
Click to collapse
That's confusing...
To clear things up... you can only update the baseband via LG's update tool.
NO ROM you find here is able to include a baseband of any sorts and the March 2012 bb, as of now, will only give you clear calls while on the stock 2.3.4 ROM.
buru898 said:
That's confusing...
To clear things up... you can only update the baseband via LG's update tool.
NO ROM you find here is able to include a baseband of any sorts and the March 2012 bb, as of now, will only give you clear calls while on the stock 2.3.4 ROM.
Click to expand...
Click to collapse
How could you downgrade your baseband? I used the restore program to revert back to stock ROM and Recovery, but when I rebooted, I still had the new baseband. What's the Baseband release prior to March 2012?
apicia said:
How could you downgrade your baseband? I used the restore program to revert back to stock ROM and Recovery, but when I rebooted, I still had the new baseband. What's the Baseband release prior to March 2012?
Click to expand...
Click to collapse
July 2011
There is a less known OCt 2011 one also.
cricketAC said:
July 2011
There is a less known OCt 2011 one also.
Click to expand...
Click to collapse
Thanks, just need to find out how to get it into NVFlash and back on my phone.
buru898 said:
That's confusing...
To clear things up... you can only update the baseband via LG's update tool.
NO ROM you find here is able to include a baseband of any sorts and the March 2012 bb, as of now, will only give you clear calls while on the stock 2.3.4 ROM.
Click to expand...
Click to collapse
o, In quick answer is not worth the try?
chipis said:
o, In quick answer is not worth the try?
Click to expand...
Click to collapse
If you are asking whether its worth trying to upgrade or not. Its a balancing act. You lose ICS sweetness, rather everyother custom ROm beside kwes1020 rooted rom but you gain better GPS lock, longer battery and better signal with the update.
apicia said:
How could you downgrade your baseband? I used the restore program to revert back to stock ROM and Recovery, but when I rebooted, I still had the new baseband. What's the Baseband release prior to March 2012?
Click to expand...
Click to collapse
So how does one revert back to July 2011 if someone upgrades to March's bb ?
breezy169 said:
So how does one revert back to July 2011 if someone upgrades to March's bb ?
Click to expand...
Click to collapse
It can be done, but involves running Windows in admin mode and following some lengthy instructions. I'll try to look up the thread.
breezy169 said:
So how does one revert back to July 2011 if someone upgrades to March's bb ?
Click to expand...
Click to collapse
Use these instructions and use V21e_00.kdz instead of V21y_00.kdz
http://forum.xda-developers.com/showthread.php?t=1610597
good luck
download kdz file from here
http://csmg.lgmobile.com:9002/swdata...00/V21E_00.kdz

[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?
Click to expand...
Click to collapse
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,
Click to expand...
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?
Click to expand...
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?
Click to expand...
Click to collapse
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
Click to expand...
Click to collapse
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
Click to expand...
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 bluetooth calling on G2x

so i just rooted my mom's phone and installed a custom rom on it but the problem is that now bluetooth calling doesnt work? And thats one of things she bought the phone for. By the way i am on the march 2012 baseband. Please help?
adil17 said:
so i just rooted my mom's phone and installed a custom rom on it but the problem is that now bluetooth calling doesnt work? And thats one of things she bought the phone for. By the way i am on the march 2012 baseband. Please help?
Click to expand...
Click to collapse
It a prob with all march 2012 basebands and any rom thays not stock 2.3.4
You gotta flash a stock rom.
Theres all kinds of answers for this if you searched.
Sent from my LG-P999 using xda premium
Bluetooth calling on G2X
adil17 said:
so i just rooted my mom's phone and installed a custom rom on it but the problem is that now bluetooth calling doesnt work? And thats one of things she bought the phone for. By the way i am on the march 2012 baseband. Please help?
Click to expand...
Click to collapse
Just to clarify, you only have to be on a stock rom (GB 2.3.4) for bluetooth calling if you are on the march 2012 baseband. You can revert your baseband to july 2011 and bluetooth calling will be just fine. I use my bluetooth headset all the time and it has worked on every ICS or JB custom rom.
Better yet, don't experiment with moms phone.
Sent from my LG-P999 using Tapatalk 2

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