Help with 2nd bootloader (noob here)

Ive searched and now im 100% certain i have a Fire HD 8.9 inch 2nd gen tablet, It has update 8.5.1 on it, Im trying to figure out if i need to somehow downgrade or if i can just install 2nd bootloader on this software version. Sorry if this is already answered i looked and didnt see it, but i did a good bit of research before asking this question, but i just wanna be 100% sure of what i need to do.

Any help is greatly appreciated!

Thanks,
deershoot3r

Very noob here

Hi y'all . I have aquestion regarding my phone Samsung Galaxy core prime. From metro It's on 5.1.1 . I got no access to pc in any formal way and I'm stuck on bootloop. I got this as a honestly a garbage coz she broke it and can't fix it . I believe it's not rooted. Is there anyway I could restore the phone to its stock firmware with no means of using a PC. ?

Samsung Galaxy core prime. Noob question.

Hi y'all . I have aquestion regarding my phone Samsung Galaxy core prime. From metro It's on 5.1.1 . I got no access to pc in any formal way and I'm stuck on bootloop. I got this as a honestly a garbage coz she broke it and can't fix it . I believe it's not rooted. Is there anyway I could restore the phone to its stock firmware with no means of using a PC. ?
Oh and by the way I mean to restore it to stock using the stock recovery