[GUIDE] Install v21y baseband on P999 w/o stock firmware using 64-bit Win7
If you own a P999 and didn't update in time to get the latest baseband from LG's Update utility this guide is for you. Windows XP compatibility mode isn't used so people such as myself who have Windows 7 Home Premium can follow this procedure. I am a Wind Mobile user and while the forums have enough information on how to do this I decided to compile a concise guide to save everyone some time.
Note that this will remove your cwm recovery installation if you have one. You will have to nvflash your phone again. And of course I am not responsible for any repercussions that may occur by you following this guide.
Extract wind firmware archive in clockworkmod/backup.
Boot into cwm recovery.
Clear data and cache.
"Recover" wind firmware from backup.
Boot into the new wind firmware.
Extract vbscript installation on PC and follow the directions from the download page. There's only one thing you do different: don't change the "Diag" menu to "EMERGENCY". Diagnostic mode is for phones that are powered on, emergency is for s/w update mode (volume down + power).
You are now running T-Mobile gingerbread with the v21y baseband! Now you can nvflash cwm recovery again and install your ROM of choice!
Does it work to downgrade ur baseband? I never got any method to work on ne pc setup
Sent from my LG-P999 using xda app-developers app
follow the steps in this thread and download the v21e KDZ file listed. i do this all the time in XP Mode virtual machine. the trick is to keep watching the USB menu in the window to make sure your phone is connected. it will disconnect once in awhile so you just have to "attach" it in the VM and it will continue http://forum.xda-developers.com/show....php?t=1680292
It’s absolutely no secret that many of us like to crack-flash our ROM … more
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