You have to rid a lot before attempt anything on your phone. MAGLRD is already in place, is a piece of the puzzle. I give you few tips of what you have looking for:
1-Format with Task29 your Phone.
2-Instal MAGLRD again. As formatting will delete it as recommended.
3-Instal CWM Recovery and set-up Partitions Size in flash.cfg (2MB + 150MB + 1MB) This details you find on any custom rom thread.
4-Boot in Recovery from MAGLRD and Install Rom, which you put on SD.
6Have fun, with Android, there is no Firefox OS.
Don't forget to hit thanx.
IF I HELPED DO NOT SAY THANKS, CLICK IT.
My Evolution: Sony Xperia Z1 - UB + 4.3 Rooted + Deodexed, HTC HD2, HTC Diamond 2, HTC HD Blackstone, Nokia 7070 Prism, Qtek 9100, Nokia 3100, Motorola T720i, Nokia 3310, Sony Ericson PF 768 (Blue)
How Get Root on Sony Xperia Z1 with Locked Bootloader and the Latest Android 4.4