This is the official page, from which you can download the Official Calus A9 Pro Stock Firmware ROM (flash file) on your Computer. The Firmware Package comes as a zip file which contains the Firmware, Flash Tool, Driver and How-to Flash Guide.
Download Calus A9 Pro Stock ROM (flash file)
Package Name: Calus_A9_Pro_SC7731_20171208_6.0_SPD.zip
Package Size: 713 MB
How-to Flash: Follow Guideline
How to Flash Calus A9 Pro Stock ROM
Step 1: Download and Extract the Calus A9 Pro Stock Firmware on your Computer.
Step 2: Once, you have extracted the Package, you will get the Firmware, Flash Tool, Driver and How-to Flash Guide.
Step 3: Now, Install the provided USB Driver on your Computer.
Step 4: Once Driver is installed, Open Flash Tool on your Computer.
Step 5: Once Flash Tool is Launched, Connect your Device to the Computer using the USB Cable.
Step 6: Now, Click on the Download or Upgrade button on your Flash Tool to begin the Flashing process.
Step 7: Once flashing is completed, Disconnect your Calus A9 Pro device from the Computer and Restart the Device.
Readme Once:
[*] Flash Tool: If you are looking for the latest version of SPD Flash Tool, then head over to SPD Flash Tool for Windows page.
[*] Backup: We recommend you to take a backup of your personal data before flashing the Stock Firmware, as flashing the firmware delete the personal data from the device.
[*] Original firmware: We only Serve the original firmware which is released by the company and we scan each of our firmware with Eset Internet Security before uploading it online.