This tutorial explains how to flash your LG Optimus One P500 back to original firmware using the KDZ firmware updater from this site. With this tutorial you will be able to upgrade your LG Optimus One P500 from any country. LG Cell Phone Software

  1. You need to download the firmware of your device. Please check here the The_ERROR thread which explains it very well:
  2. Download KDZ updater from here and uncompress it
  3. Install msxml.msi from the uncompressed directory
  4. Connect your device (do not turn on disk storage) and run KDZ_FW_UPD.exe (Has administrator).
  5. Select Type : 3GQCT
  6. Select PhoneMode : DIAG
  7. In KDZ file : Choose the ROM file you downloaded in the first step
  8. Press Launch software update and wait (It will be 10 minutes or so). In your phone it will appear "Emergency mode". Wait until it reboots. LG Phone Problem and Solution

And you’re done! Cheers

Warning: I will not be responsible for any damage of your device. Do it at your own risk! Has everything involving flashing, it always has its risks! LG-Optimus info

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Tyra Misoux on 14 March, 2011 at 5:14 pm #

You saved my life! This also works for lot other LG models!
For example for my LG E720. Just was able to downgrade from 2.2.1 to 2.2 using this method.
thanks a lot

maller on 18 August, 2011 at 1:21 am #

i’ve tried this and while it was stuck in emergency mode i’ve disconnected the phone and now it’s completely dead..doesnt even charge..
any ideas???

shankyroy on 25 August, 2011 at 12:49 am #

usb debugging mode should be enabled or not ?????

shankyroy on 25 August, 2011 at 12:58 am #

should we enable usb debug mode or not ???

SAMarth on 15 September, 2011 at 6:41 am #

if I knw which version i have to downgrade then will it regain the warranty back?

Please mention steps for non rooted o1 users so that we can get back to the previous versions without letting lg service centre know about it!

Sam on 26 September, 2011 at 7:17 am #

How do I get out emergency mode on my Lg p500?

drew webb on 11 November, 2011 at 3:31 am #

my lg optimus one p500 phone stuck in emergency mode and i cant get it out i dont know how, i was updateing it to 2.3 android and it just failed and stayed on emergency mode

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