I tried the whole process again and once again everything said okay. I went to wipe userdata and it said it failed (too many links) Kindle is still staying stuck at boot logo.
edit: Thank you guys so much! After like 6 reboots it finally launched to the screen where I can select my language, now I'm going to try to flash a custom rom, twrp etc. again and maybe more successful. Thank you guys again so much!