mobile

Ok i wanna upgrade bootloader to 04.05 prob is i dont have a pc nor i kno anyone i could ask to use pc i am rooted+unlocked bootloader which i done using an app from playstore+towelroot also im running twrp+multirom im on a custom rom.

Does anyone know of a flashable zip of bootloader 04.05?
Or can anyone tell me if its possable to use terminal emulator to flash the bootloader?
Or maybes a way to get full stock back so i can get latest bootloader through updating to android 5.1?
Thanks in advance