Building system.img for a device make_ext4fs [need help] - Android Q&A, Help & Troubleshooting

I have a local phone of my career. Probably you don't know which, it doesn't matter either. One is on 4.3 and other is on 4.4 !
I have dumped 4.4's dev/block/platform/msm_sdcc.1/by-name files (system, boot, aboot, recovery, sbl1, modem, etc every partition) and flashed partitions on 4.3 one.
But system didn't get flashed. I extracted system.img which I dumped and got /system files! Now using make_ext4fs I have created a filesystem
make_ext4fs -s -S file_contexts -l 1024M -a system system.img ../output
>make_ext4fs -s -S file_context -l 1024M -a system system.img ../output
Creating filesystem with parameters:
Size: 1073741824
Block size: 4096
Blocks per group: 32768
Inodes per group: 8192
Inode size: 256
Journal blocks: 4096
Label:
Blocks: 262144
Block groups: 8
Reserved block group size: 63
Created filesystem with 2360/65536 inodes and 199521/262144 blocks
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I have got the system.img and flashed it via fastboot:
fastboot flash system system.img
target reported max download size of 301989888 bytes
erasing 'system'...
OKAY [ 21.150s]
sending sparse 'system' (294325 KB)...
OKAY [ 10.288s]
writing 'system'...
OKAY [ 26.686s]
sending sparse 'system' (285521 KB)...
OKAY [ 9.826s]
writing 'system'...
OKAY [ 26.364s]
sending sparse 'system' (202921 KB)...
OKAY [ 6.836s]
writing 'system'...
OKAY [ 16.839s]
finished. total time: 270.100s
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System booted up but has:
No adb shell (- exec '/system/bin/sh' failed: Exec format error (8) -)
No SIM
No baseband
No IMEI
No MAC-WIFI
No MAC-Bluetooth
Could be due to file_context or selinux, anyways help plz. I am using the one which is already there in the directory. I am building image for android 4.4 (using prebuilt windows tools with cygwin x64_86)

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Guys .. Any help for the reported error?!
Thanks.