how to uninstall lollipop on my lg l90

You would have to flash the prior OS onto the device. I am not sure how to do that on an LG though. A big hurdle would be getting the file.
 
You would have to flash the KitKat KDZ. Search for the link on Google, download it, then flash it using the lg flash tool. If you have a custom recovery installed you could simply flash the KitKat bookstack, restore from a KitKat nandroid backup that is on XDA and then reboot the system and you are done.
 
Either the kdz file or the tot file, depending on which flash tool you prefer.
 
If possible please advise in simpleton terms. Once I download and flash the kitkat OS, how do I discard lollipop and install kitkat? Please help! Thank you
 

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