So let's get started!!!
-dr.notor (For the links and some pictures)
-ADB ( Don't know need this, but just incase )
Baseband files are included here by dr.notor
For Official LG Gingerbread 2.3.3, Custom ROMS (like, openOptimus v2.202.1, AGA-ROM, GingerLOL) Download P500-v20G-baseband.7z
For Non-Ginger ROMS (CyanogenMod 7.1, Andy572's ROM) or Froyo... Download P500-v10E-baseband.7z
If u wanna follow his thread, go there... But still you want my guide, stay here and download the .7z files...
Now here we go!!!
1. Extract the files and you must have this stuffs...
2. Extract into a folder.
3. Connect your phone to PC.
(REMINDER) Do disable temporary of the LG USB Modem in device manager...
4. Open LGMDPv1.5.exe
5. Select Port
6. Select your phone and connect...
7. Browse the folder you created... Select the folder... And open...
8. Once done, the application will prompt some shitty errors, ignore it and press OK.
9. Once done, close the selection, don't touch anything else...
10. Press Download.
Once you press 'Download' button, please remember, DO NOT INTERRUPT OR DISCONNECT/UNPLUG YOUR PHONE WHEN UPGRADING OF THE BASEBAND! It will only done when it shows 'Download Complete'. The application will first backup your NV2 ( IMEI, Serial n such), then it will prompt like this:
Do not touch your phone or pc and get a stable USB cable, don't use broken USB cables (not like disconnects by itself...). It will automatically connects....
After NV2 Backup it will shows the flashing of baseband (Amss, amsshd).Once done it will ask for NV2 Restore, do the same thing and wait...
Then this... Once restored, it will automatically reboots and shows 'Download Complete', that... YOU ARE DONE!!! AND IS A SUCCESS
-Pictures are by dr.notor
Any question, comment below... If this thread helped, press the thanks button! And also should thanks dr.notor for the files...