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first step: look in flash memory for a valid image : issue the command; rommon />dir flash :
if valid flash image is located, attempt to boot the image; issue the command; rommon/> bootflash:
second step: if configuration register is correct usse the # sh start command to check if there is an instruction for router to use a different location for cisco IOS image
0x2102: value indicates router attempts to load Cisco IOS image from flash and loads start-up config from NVRAM
0x2142: value indicates router ignores content in NVRAM
0x2120: value indicates boots into ROMMON mode
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