Samsung Galaxy Core 2 (SM-G355H) Root

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Detailed steps:
1. Download the file attached in this post and copy it into your external SD card
2. Switch off your phone and boot into recovery by holding Volume Up + Power + Home buttons (Stock recovery is able to flash this file)
3. Navigate by pressing the Volume Up/Down button and choose "Apply update from external storage" by using the Power button.
4. Select the file UPDATE-Kinguser-3.4.0.zip
5. The phone will auto reboot and gives root access

UPDATE-Kinguser-3.4.0.zip