im stuck in a boot loop, heeeellp

Someone please help, I have an LG g3 and I'm stuck in what I'm guessing is called a boot loop, but unlike other boot loops the LG logo screen doesn't flicker like how most boot loop cases are, my phonejust stays at the lg logo screen and doesnt do anything, it started after I tried to do a hard reset in hope to delete remaining su files from when i rooted my phone since I ccouldn't delete them with any sort of file manager, ive heard of using Roms and stuff like that but I can't find any for my phone model no. Someone please help, if you can find Roms that are compatable with my phone model which is US990, please tell me thank you

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