Hi I found a similar article on androidforums.com so I thought id make one here as a lot of people still seem to not know how to flash basebands and go from there. Ill start from the beginning.
For those who don't understand what this is about.
Old Baseband = If you have the Stock Froyo (2.2) Android system on your phone then you have the OLD BASEBAND, and you do not need this unless you updated to past 2.2.2 then continue reading if you wish to root your phone the easy way.
New Baseband = If you updated to the Stock Gingerbread (2.3) Android System on your Optimus One, then you fit this category, Lg have implemented a new baseband in this update which makes any Roms based on the old baseband not function, as well as making it more difficult to root your phone
FLASHING OLD BASEBAND
If you're already on official Gingerbread version you will need to downgrade your version to Froyo 2.2.2 using KDZ Updater. This is because the new Gingerbread contains the new baseband, and the Froyo firmware is the old baseband.
To do this please go onto this link that contains kdz and the stock Froyo 2.2.2 Rom required to flash. The reason you need 2.2.2 is its the easiest and proven version to work with Gingerbreak to root your device.
Notice: If by some ACCIDENTAL reason, your phone gets stuck in EMERGENCY MODE during flashing, follow the instructions on this link how to use KDZs functions to continue flashing the firmware you downloaded in Emergency mode. http://forum.xda-developers.com/show....php?t=1275523
FLASHING NEW BASEBAND
The Kdz File for new baseband is below, use the same method as above only using the v20G .kdz file instead of the 2.2.2 v10E update.
This will update your phone to the official LG 2.3 firmware, in which the new baseband originated.
If then stuck on LG Logo OR boot animation, try pulling and putting in your battery, turning on your phone and holding down volume down and home key, this should reset your phone to factory and then you will be able to boot into the stock gingerbread.
Make sure, after you download the program, you go into your cmd, then go into the ADB folder, drag the ABD exe file into command prompt, delete the .exe part and add devices, so it look like this
OR
Download the ADB.zip attachment on this post, EXTRACT it so cmdXP and cmd7 are located inside the ADB folder in the Superoneclick directory, and run either version, depending on your windows version (This links you directly into ADB app, instead of manually dragging ADB.exe int cmd, really its just for your convinience.)
Then all you have to do is type the following lines.
adb devices
press enter
adb shell
press enter
then type in the following directly after echo 1 > /data/local/lge_adb.conf
press enter.
Then go into Superoneclick.exe, select auto method and run root, this should then eventually root your device.
***WARNING***
Some Antivirus softwares will detect Superoneclick as a Virus.
IT IS NOT A VIRUS, just the types of exploite code it uses makes some antivirus software think of it as malicious. Just disable your AV for 5 mins before you extract Superoneclick.
RECOVERY
There's two popular custom Recovery versions for O1 - AmonRa and ClockworkMod
The easiest way to flash ClockworkMod Recovery is by downloading ROM Manager app from the Market (free or donate version doesn't matter) and choose to flash the latest recovery version and choose the option to Reboot in Recovery mode.
For Other Recoveries including Amonra there are a few links, but here is the one that has flashable zips
Just flash the zip files in Clockworkmod recovery menu, after you install that through Rom Manager if you wish to use a different recovery.
Now that you got the right baseband + your device is rooted and loaded with a custom recovery you may install any Rom you wish that is based on the correct baseband such as
Don't know how many guides still to come on downgrading baseband.....
People...do search before making a new guide......
MODERATOR...plz look into this thread...
Sent from my LG-P500 using xda premium
Sony Xperia S
DEVICE HISTORY Nokia 5300, SE W580i, SE F305, Lg KP500, Nokia 3600, Spice Mi 300, Lg P500, Sony Xperia S
My apps on google play
Open dropbox account from this link and we both get 250MB additional space
Don't know how many guides still to come on downgrading baseband.....
People...do search before making a new guide......
MODERATOR...plz look into this thread...
Sent from my LG-P500 using xda premium
Guys i did a search and looked into the sticky how to, and the only thing about downgrading baseband is using LGMDP, and kdz is only "mentioned" as a tool for unbricking your phone and flashing old firmware, new users would not know to use kdz.
Also this is a universal guide to root ANY lg optimus one together with having the old baseband, without having to mess around with SDK or LGMDP.
All members have to do now is look at this thread and all their questions are answered hopefully...
DIfference betweem this and doks.
This uses Official Lg KDZ updater, which means much less likely to brick your phone and if it does, KDZ is what is used to unbrick it anyway,
its not that they are making roms incompatiable, its that they are not designed for those Roms,
So far there has been no reports of any advantage having a new baseband, Lg engineers obviously decided on it for some reason, but the old baseband is more than fine, and in fact i have read several reports that with the new baseband gsm reception got worse in areas that they used to have fine reception, but thats all speculation.
Your best bet is to try for yourself, but if you want to make use of Roms such as miks cyanogen mod or others you have to use the old baseband.
There are other Roms available on the new baseband, so its upto you.
I suggest what rom you would like to install on your phone first, then pick the baseband it requires, as its only a simple flashing of your firmware.
Also note Gingerbreak.apk doesnt root any stock firmware past the 2.2.2 update.
Personally i pick the functionality and advantage of having a custom rom such as cyanogenmod over an update to the baseband
Does this guide work for Optimus T (LG P509) ? I have got one recently and currently using stock 2.2 on it. I don't know the difference between LG p500 and LG P509. I'm coming from T-Mobile G1 on which I'm using CM 7.1. Thanks for guidance.
Sent from my Dream/Sapphire using xda premium
Phone: Galaxy Note AT&T SGHi717 Radio : Stock Rom : Stock GB Rooted
looking at it, i assume you can use this guide for p509, but i can not be 100% sure, try finding the t-mobile 2.2 kdz file, but yes not 100% sure the main difference.
DIfference betweem this and doks.
This uses Official Lg KDZ updater, which means much less likely to brick your phone and if it does, KDZ is what is used to unbrick it anyway,
This option is much simpler to use for anyone.
KDZ can brick your phone permanently. Dont use KDZ unless there is no other option, and using KDZ just to flash baseband is just dumb since there are better and safer methods. KDZ wipes out everything, so there is a high chance to brick, and it can't be fixed other than by going to the service center. This thread by doktornoktor is safer.
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[HOWTO] Flashing OLD/NEW Baseband Using KDZ + Rooting + Installing Custom Recovery
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