Here is a VeryKool S5002 Stock ROM Firmware which can be used to load and flash stock firmware on any VeryKool S5002 of this exact variant. Any MTK Flash tools can download and flash this VeryKool S5002 flash file on your S5002 so long as that MTK Flash Tool supports MTK Scatter File.
Since most major software malfunctions on any MTK Android devices can only be corrected by flashing, this S5002 flash file, if properly used, can unbrick (debrick) your S5002 and also corrects any software issues your VeryKool S5002 may currently have. Also, keep in mind that when you load stock firmware on your VeryKool S5002 using any MTK flash tool, your VeryKool S5002 will be reset to factory defaults settings and by that, definately, your UserData will be lost including contacts, messages and others.
Note: If your S5002 is already bricked and you want to unbrick it, you will need to pay closer attention to the tutorials contained below here.
VeryKool S5002 Stock ROM Firmware Download Link(s)
1. VeryKool S5002_v1.0_20150512 (Android 4.4.2)
2. VeryKool S5002_v1.0_20150520 (Android 4.4.2)
How to Flash Stock Firmware On VeryKool S5002
1. Download your VeryKool S5002 stock ROM firmware from the link above.
2. Extract the VeryKool S5002 Firmware you downloaded from the link above onto a folder on your PC.
3. Download and install MTK android device drivers on your PC. You may skip this step if you have installed MTK drivers on your PC already otherwise, download MTK drivers here
4. Now, choose either of the tools listed below here to load the stock firmware on your VeryKool S5002.
2. NCK Box
3. Miracle Box
See video tutorial here: How to Flash MTK Android Devices Video Tutorial
Note
1. Each of the tools listed above contained step by step guides with illustrated pictures on how to flash stock firmware on your VeryKool S5002.
2. If your device is bricked already, I recommend that you use NCK Box or SP Flash. Both are the safest toolS for flashing MTK Android devices.
3. If you require any further assistance, simply drop your comment detailing the issue(s) and I shall help you revive your VeryKool S5002, if need be.