Below is the direct link to download the Bluboo B7000 Stock Firmware (flash file) from GoogleDrive. Firmware contains Flash Tool, Driver and instructions.
How to Flash
Step 1: Download the stock firmware on your computer.
Step 2: Extract the firmware.
Step 3: After extracting you will find the update.zip file.
Step 4: Place it in the Phone SD memory.
Step 5: Flash it through the recovery.
[*] Take a Backup of your personal data before flashing or installing the firmware on your smartphone. As this helps you to recover the personal data whenever any thing wrong happens.