For Intel-based Acer tablets (like the Iconia W series), the process is more complex. Acer often locked the bootloader, and the Intel Phone Flash Tool requires a specific "bootloader unlock code" from Acer—which is no longer available for legacy devices.
Before using the Acer Tablet Flash Tool, take the following precautions: acer tablet flash tool
For a visual walkthrough of the MediaTek flashing process, you can watch this demonstration: For Intel-based Acer tablets (like the Iconia W