This can fix bricked device which can enter EDL mode.but I don't have time to write a step by step howtos, anyone whom can help is welcomed.
links ：http://pan.baidu.com/s/1dE8Xse1 password：1bih
mirrors by @killer23d:
MD5: 314740B24_MR79ZTE_A2017V1.0.0B07.zip BB6CFF352DE7F9A62B8551749F3BF9D6
by @jcadduono :
NOTICE： see the picture below, you should delete the two provision xml files after you uncompress the firmware. the provision file is to provision the UFS or EMMC chip .
we can think it as format one storage to several partitons . so we dont need that. just delete this two files,so we can keep efs intact .