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[[Image:CTR_Bootrom_Error.jpg|500px]]
[[Image:CTR_Bootrom_Error.jpg|500px]]
The 3DS' Boot procedure:
* 0 Seconds - unit is powered on bootrom begins execution
* 2 Seconds - bootrom attempts to initialize the NAND. If the NAND is successfully initialized, the bootrom loads the firmware stored in the NAND [[FIRM]] partition which handles booting the rest of the system. The ARM11 kernel loaded from FIRM then launches the [[NCCH#CXI|CXI]] ARM11 system modules loaded from FIRM.(Note that the ARM11 kernel does not handle any encryption/RSA verification, this is handled by the [[FIRM|ARM9]]) If the NAND cannot be initialized, (i.e. the NAND chip is not connected/damaged etc) a blue error screen similar to the screen above appears.
* 3 Seconds - all essential hardware is active. The [[Process_Manager_Services|PM]] module launches [[NS]], [[NS]] then launches [[ErrDisp]] and the [[Configuration Memory#ACTIVEMENUTID|current active menu]] via PM module. For retail units this menu is usually the [[Home Menu]]. NS will [[NS|auto-boot]] titles instead of launching ErrDisp/Home Menu, if auto-booting is needed. Note that PM module first launches the module dependencies when launching a process, prior to actually launching the process.
* 4 Seconds - the LCD screens are initialized
* 7 Seconds - [[Home Menu]] is fully initialized/loaded