Download Kata B1 Stock Firmware (Flash File) from below direct link. The Kata B1 Flash Tool, USB Driver and Flashing Instructions included here.
[*] Chipset: Mediatek MT6572.
[*] Flash Tool: Smart Phone Flash Tool.
Download Kata B1 Firmware (Flash File)
Software Version: Kata-B1-QB15D-M526F-V1.0.0
Android Version: v4.2.2 (Jelly Bean)
File Size: 395 MB
File Extracting Password: firmwarefile.com
How To Flash Firmware
Step-1: Download and extract the Kata B1 flash file on your computer.
Step-2: Install Mediatek MTK USB driver (skip if already installed).
Step-3: Open SP Flash Tool and load the Scatter file from firmware folder.
Step-4: Click on Upgrade / Download button in Flash Tool for begin the flashing.
Step-5: Turn power off your device connect it to Computer using USB.
Step-6: Now wait until during the flashing process after done you will be see Download OK.
[*] The firmware help to recover OS upgrade, dead issue, user security lock, and any software related problems. At flashing process your all user database will be remove. Take a backup before flashing your device.