Firstly not responsible for any bricked , hard bricked devices neither I am responsible for any damage you cause to your phone by following the below mentioned methods.
This thread is AIO thread for Mediatek Devices ( If users can help me out then possibly we can also include spreadtrum and SD devices .
(I) Official ROM Files ( This link may contain ROMs for Spreadtrum and SD devices as well as i have not looked into each and every device )
Download the entire rom for your mediatek devices from the above link ie http://www.needrom.com/category/others/i-j-k-...f/
Extract the rar file and use the scatter file in the menu
1) One click root methods ( Help me out with which one works for your devices if any )
2) Patching system.img ( Difficult Process needs understanding commands a little . Novice users ignore )
First find the official rom system.img or your System.img pulled from your deviceFor Linux Mount system.img from the above file to edit system partition ( This is called unpacking system.img)
Once mounted download SuperSu.zip
open update binary in meta-inf folder
read through the update-binary ( it is a shell script ) and do the necessary changes based on your device config ( Api , processor type ) and make the necessary changes and remember the permission for each file
Finally Repack the system.img and flash to your phone using SP Tool .
2) For Windows ( tools exist on windows too ) . Google that out or ill help you later
(IV) Custom Recovery for Mediatek Devices
Follow this tutorial for Mediatek Devices
Find a similar device for eg for Lyf Flame 2 an almost identical clone is zopo c zp 330 . Modify the TWRP http://www.zopomobile.com/forum/thread-70694-1-... and try ur luck . Flash the recovery using SP Flash Tool
(V) Unbrick for Mediatek : Use SP FlashTool with Scatter file . 99% unbrick guranteed
(VI) IMEI Repair for Mediatek : Many apps try your luck https://play.google.com/store/apps/similar?id=c...
( VII ) Readback using SP FlashTool dump of your rom
Running Short of Time . Best I could help in the little time i get .Hope it helps some of the users
Also MTK Droid Tools is an awesome utilty if u have a mediatek 65xx chipset