While I cannot peek inside the archive, files with this naming convention typically include:
Most BLU devices use the SP Flash Tool . You would load the "Scatter" file from the extracted folder into the tool. BLU.1306720WRZ.rar
A text file that tells the flashing tool (like SP Flash Tool) where to install each part of the software. While I cannot peek inside the archive, files
Turn off the phone and connect it to the PC (sometimes while holding a volume button) to begin the update. BLU.1306720WRZ.rar
Flashing the wrong firmware can permanently damage ("hard brick") your phone. Always double-check that your specific model number matches the one intended for this file before proceeding.