[Optimus One, P500, V General] concious:
Hello all,

since I'd spent a couple of hours trying to solve this problem, I figured I'd say a few sentences about this as at least I myself would have found it useful...

This is regarding the LGP500 / LG Electronics P500 Android phone. For similar phone users: if you know your key combinations for hard reset and Emergency modes AND you know which ROM image to use (and have access to it), this might help your Android phone as well.

After somehow having managed to screw up the Android OS / /system (unrooted the phone (this went well) and then did some extensive modification/experimentation with the system; I think it might have been terminating the abd terminal while insmod'ing a faulty kernel module that screwed things up),

I ended up with a phone that would only show the LG logo during boot time - not even an Android logo (as the user above had had). Obviously, the phone did not respond to any USB connection queries; the hard reset (keep HOME+VOLUME_DOWN pressed, press Power) would end up splashing a pretty reset image/logo, but would then fall back / reboot into the LG logo.

In the end, the procedure turned out to be rather simple and practically as explained above:

1) make sure your host OS recognizes the phone - install the phone driver in Windows (use "LGMobile update", might need to enter your IMEI OR (Model AND Serial num.); under the battery) or update /etc/udev rules in Linux (I didn't want to further experiment with a windows-program firmware updater under Wine, so used Windows for this); OSX doesn't need any action AFAIK;

2) make sure the phone is off. Remove and re-insert battery if needed;

3) while holding RETURN+VOLUME_UP (not HOME, but RETURN (the right key out of the two in the center), and not VolDOWN, but VolUP this time), press Power. After some time, the phone should display a bright yellow screen with the text "Emergency mode." (**);

4) connect the USB. You have to act fast now, as the phone will only wait for some seconds before rebooting back into agony. as far as I understand, it is now just waiting for the new ROM image;

5) having followed the steps in the previous post above regarding setting up KDZ_FW_UPD and having selected your ROM image, make sure you set the mode right - the only difference from above is that now, you have to choose "Emergency" instead of "DIAG.";

6) Hit "Launch software update." If it hangs and becomes unresponsive for a while, that's a good sign. It should later start dumping log data into the window. Obviously, don't disconnect (THEN you might end up with a bricked phone..) etc.;

7) After everything finishes, you might need to restart the phone once more and do a hard reset (as mentioned above); but might not be needed.

(**) - if after trying a lot of times with the RETURN+VOL_DOWN -> PowerUp combination (and inserting the USB cable afterwards) you end up not arriving at a bright yellow screen, you might be screwed. At least this procedure relies on the assumption that the Emergency mode is working. But as far as I understand, you can completely screw your OS/ROM up and still have the Emg. mode available; so check thoroughly before making any conclusions. :)

Sorry for the long post, but maybe this will save someone some time/money. :)

Regards,

Kostas.