Ok so my LG Optimus M Plus was rooted the first day I got it, had been working good, turning it on and off, but like a week ago, after having it rooted for almost a month, it decided to get sutck on the LG Logo. I did the hard reset but when it boots up still stuck on the lg logo. Well today, after trying so many attempts with different keys, I got it to do something.
What I did is I pressed volumen down, search key and power button, as soon as I saw the LG Logo a let go the power button and search buttong but kept volumen down pressed and a different screen showed up, it has the LG Logo on top and it says "Download is in progress. Do not disconnect cable." It's been "downloading" for about 10min now and I'm not sure if it really is downloading something or it got stuck again. I'm gonna let it plugged in all night and see what happens..I'll keep you posted.
Attached is a pic I took