Given the 2015 timestamp, this is likely a flashing tool (like SP Flash Tool or a vendor-specific updater) or stock firmware for an Android device, tablet, or IoT device manufactured around late 2015 or early 2016.
Always back up current data before attempting to flash new software. To give you a better review, I'd need to know: What specific device (phone, tablet) is this for? Download Flash201512211106 rar
What (Windows) are you using to extract it? Where did you download it from (to check for safety)? Given the 2015 timestamp, this is likely a
Returning a customized device to factory settings. 3. Potential Contents A .rar file of this nature usually contains: A firmware image file (often .img or .bin ). What (Windows) are you using to extract it
A scatter file or configuration file (like MTxxxx_Android_scatter.txt ). Flashing driver files or the executable flash tool itself. 4.
Changing the operating system version.