.MCUSW File Extension
What is an MCUSW file?
File used by JAF, a firmware update flashing application for Nokia mobile phones that use the Symbian OS; contains firmware for the phone.
You can download the MCUSW file through Navifirm, a Nokia Firmware Downloader. Then, you can use JAF to flash, or overwrite, the firmware in the MCUSW file to Nokia mobile phones to personalize or update them.
NOTE: JAF is included in the Nokia Flash Tools download listed below.