HELP!my system files are all empty.

FLARE J3 LITE is my phone
I am rooted but my phone getting slowly so i go to settings and format,i have custom recovery too and then after format,it reboot but in twrp and then i reboot twrp again it keeps in twrp.

i do flashing but my system.img seems not good because system files still empty.
I try to extract it but its not working so i did a something.

I EXTRACT OTHER SYSTEM.IMG BUT IT WORK AND WHEN I DO MY SYSTEM.IMG IT NOT RESPONDING.

WHAT CAN I DO?
MY FIRST THOUGHT IS I THINK MY SYSTEM.IMG IS CORRUPTED

TELL ME WHAT YOU THINK AND WHAT I CAN DO Please i really need help right now
Thank you even if you just think of it

MORE INFO ABOUT PHONE:
1 GB RAM
7.0 NOUGAT
8B ROM BUT ACTUALLY IN REAL 4GB ONLY
MTK6580

I CAN SEND YOU OF MY TWRP SCREENSHOT IF YOU WANT

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