Why I got stucked in downloading mode ?

Nov 10, 2016
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I'm using GALAXY S4(GT-I9515).I have rooted it using kingroot. Then I flashed twrp recovery using (FLASHIFY) a flash tool.My phone boots and got stucked in download mode.It's shows

Could not do a normal boot.
Odin Mode.
Model:GT-I9515
System Rom:Custom
System Status: Custom
Knox Kernel Lock: 0x0
Knox Warranty Void: 0x0
CSB-Config-LSB: 0x30
Write protection: enable
eMMC burst mode enabled

What can I do to get my phone back? But when I try to boot into recovery, it works.I saw some forums that tells to wipe dalivik cache....I tried everything and when I reboot my phone, it goes again to download mode.My phone is S4 value edition (United Arab Emirates) ,I cannot find my proper stock firmware anywhere.Is there any way to get my phone back.Why this problem happens ?Can I give my phone to any customer service or can I service the phone of my own.Plz help me.Frankly,I cannot sleep for those days after this problem happens.Plz anyone help me .thank u
 
I have tried downloading this.Its 1.6 GB. But when it reaches 300MB it stopped and show completed.When I go to extract this zip , it says some unwanted zip.What should I do to download the firmware completely?
Plz help me