Nexus 4 Red Light of death topic

Hi all I have a nexus 4 that up until last week was problem free. I had 5.0 lollipop installed and decided to revert back to 4.2.2 which I followed via one of the instructions out there. I didnt notice much difference with 4.2.2 so i proceeded to keep updating one at a time as the ota updates came to my phone. I did notice though that my phones battery seemed to get worse and worse for life..So i finally got to 4.3 and I had charged my phone up went home after work and went to bed a few hours later I hear a text message sound I went to get phone and it was saying battery only 13% so i plugged it in and phone shut off on its own...I tried to start it back up and all of a sudden red light of death came on so i left it went back to bed a few more hours of charging I thought it was good but no go. I quickly found the supposed fix to pull battery and it will reset phone.. Pulled it apart pulled battery connector and reconnected still no start. Check battery voltage found only 2.8 volts tried found again and still no go just red light. Totaly pulled phone apart mother board display camera etc hoping that somehow the static charge in chips will clear red light fault..even let it sit overnite. Still no go read somewhere about boosting battery with 5vdc connected it up boosted bad and checked it it went up to 3.3volts....Put back into phone and away she went....So I ordered a new battery and waiting for it to come. So i want to go back to lollipop and now when i plug it into my comp It doesnt see it and I cant load drivers Ive read how many posts here and tried numerous fixes but no go even 2 diferent computers.... I have my wireless turned on all the time hoping to get 5.0 OTA update but thats not happening either starting to wonder if i have a bad motherboard or something thats caused the battery to fail....Done factory reset a million times and cant unlock bootloader...since comp doesnt see it.....Was wondering if somehow i can use airdroid to load bootloader unlock on my phone and unlock it like adb flashboot does in windows? thanks :crying: