Use a tool like 7-Zip or WinRAR to get the folders inside.
Turn off the phone and connect it to the PC (sometimes while holding a volume button) to begin the update. BLU.1306720WRZ.rar
A text file that tells the flashing tool (like SP Flash Tool) where to install each part of the software. Use a tool like 7-Zip or WinRAR to get the folders inside
While I cannot peek inside the archive, files with this naming convention typically include: BLU.1306720WRZ.rar
Most BLU devices use the SP Flash Tool . You would load the "Scatter" file from the extracted folder into the tool.
The actual operating system data (system, boot, recovery, etc.).