Hola, yo hice downgrade a Argentina Retail 4.4.4 de esta manera:
(
Sin flashear motoboot.img)
No tuve problema flasheando gpt.bin (particiones)
mfastboot erase cache
mfastboot erase userdata
mfastboot flash partition gpt.bin
mfastboot flash logo logo.bin
mfastboot flash boot boot.img
mfastboot flash recovery recovery.img
mfastboot flash system system.img_sparsechunk.0
mfastboot flash system system.img_sparsechunk.1
mfastboot flash system system.img_sparsechunk.2
mfastboot flash modem NON-HLOS.bin
mfastboot erase modemst1
mfastboot erase modemst2
mfastboot flash fsg fsg.mbn
mfastboot erase cache
mfastboot erase userdata
mfastboot reboot
En este post está el firmware Argentina Retail 4.4.4
http://www.grupoandroid.com/topic/11...pt-automatico
Saludos!