[Help] zte blade X9/A711 Stuck on Zte logo

im a noob i admit it
my zte blade a711 / n939sc stuck on logo after i do this command
"fastboot erase cache "
"fastboot erase userdata"
after that im stuck on logo
i do that because my phone can't go in TWRP after i flash X9 room i downloaded
after i flash the room system doing fine everything fine only i can't access twrp anymore
i search in google and meet that command wich tell me to erase cache and userdata
after that my phone can't boot and stuck at ZTE blade logo for eternity

what have i do
Try recover twrp with twrp.img --> nothing change / happened before i erase user data and cache
try another recovery image still same

i have a nandroid backup from twrp, but i can't access twrp to restore it wich mean this backup maybe useless or just i dont know how to use it .

please any senior here help me if you have some stock rom or how to recover my backup file from a phone that can't get in twrp / recovery

my phone only can boot at fastboot and can do flash from fastboot only .

thx and sorry for the long story ..:crying: