.FIRM File Extension
Boot9Strap 3DS Firmware File
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What is a FIRM file?
A FIRM file is a firmware file used by Boot9Strap, a program used to install custom firmware on a Nintendo 3DS video game console. It contains data used to modify a Nintendo 3DS for various purposes, such as adding support for software, modifying a game, or providing boot-up directions. FIRM files are commonly used for storing Luma3DS firmware.
More Information
Instead of .BIN files, Boot9Strap uses FIRM files for payloads. FIRM files are typically placed and located in the "boot9strap" folder on the SD card of the Nintendo 3DS.
How to open a FIRM file
Most users do not need to open FIRM files on a computer. Instead, they install FIRM files directly on a Nintendo 3DS gaming console with Boot9Strap. However, users can also parse, extract, and build 3DS Firmware FIRM files on their computer with the free firmtool utility.