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HERE

You can Download any Mobile Original(OG) Firmware/Stock Rom.

&

Its free 

 So Download your mobile Firmware From Here...

 Samsung SM-G530H

Network -GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, LTE

SIM-Single SIM(M-SIM) or Dual SIM (M-SIM, dual stand-by)
Display  - touchscreen, 16M
Size- 5.0(in)

D -Resolution -540 x 960 pixels

Multitouch Screen- Yes

OS- Google Android OS, v4.4.4 (KitKat), to v5.0.2  /v5.1.1

Chipset - Qualcom Snapdragon 410 (MSM8916)

CPU -Quad-core 1.2 GHz( Cortex-A53)

Memory Card slot- microSD, up to 64 GB

Internal- 8 GB, 1 GB RAM
Camera-P camera 8 MP, 

Secondary - 5 MP
Sound - Alert types Vibration; MP3, ringtones
Loudspeaker -Yes
3.5mm jack-Yes

WLAN -Wi-Fi,Wi-Fi Direct, hotspot
Bluetooth -v4.0, 

USB-microUSB v2.0

Battery  - Removable Li-Ion 2600 mAh battery

Samsung  stock rom download files flash by odin only ..so 1st download odin flasher for samsung...then flash it via odin.

 Download link attached below

DOWNLOAD 

&  

See How to Flash your Phone

1.Download and install Samsung USB Driver on your computer. 

2. Download & extract zip file in your computer...

3. Power off your Samsung device.

4. Go to Download mode using vol-&home key&power key at same time.on your Samsung Devices.

See full Details how about to flash click here