Get lgdmp (firmware flasher) on PC
Link:
http://*******/5v3zU
Open lgdmp.exe
Disable LG modem
Device manager -> modems
Go to emergency mode first.
For that:
Power off phone (even if by taking out battery) -> keep press volume up+back button and press power button.
Now u will enter emergency mode
In lgdmp click select port
Phone will be detected automatically -> press connect
Close the pop-up window that shows to select image file
Backup NV
Tools -> NV backup
Download recovery
Link:
http://*******/5v3tT
Unzip the downloaded recovery into a folder
Open the extracted folder as the image folder in lgdmp
It will show some errors. Don't mind and just close the image selection window
Now press download in main window of lgdmp
It will flash recovery to the phone
After its complete u can boot to recovery by keycombination menu + volume down when pressing power button
Hope it will help
Edit: xda don't allow adfly links so download files from
http://lg-p500-optimusone.blogspot.in/p/flashing-custom-recovery-cwm-from-lgmdp.html
Sent from my LG-P500 using XDA