Need to Update my LG Optimus L9 P769 to at least Kitkat 4.4
I've read that if your LG Optimus L9 P769 was made after June(?) 2013 then you will not be able to unlock your bootloader, however mine was made in 2012. My question is will this method work for me? As stated in the title I need to update my OS past Jellybean 4.1.2.
Another question I have is will I be able to do this process on Windows 7? I watched the video and saw that he chose to change the compatibility of a program to Windows XP (I think..).
Also, does anyone know how to backup nearly everything on my phone so when I do install a custom ROM for Kitkat 4.4 I can just recover everything (contacts, messages, pictures, videos, etc....everything basically

)?
And lastly, is there a trusted and stable ROM for Kitkat 4.4?
---------- Post added at 08:17 AM ---------- Previous post was at 08:13 AM ----------
When this in the review process , to the point that checks the battery my stop .Diz that the battery is low , and this fully charged. Do you know why that?
I've read that for some reason the phone thinks its at 1% battery instead of 100%. Try draining the battery to 80-90% and try again.