CISCO Router configuration register

Hello,

i want to know what a router do if the configuration register is set to
0x2102.

In some lyrics i found that in this case it prevents the successfull loading
of the Cisco IOS from flash memory.

But also i found this explantion:

" The factory-default setting for the configuration register is 0x2102,
which indicates that the router should attempt to load a Cisco IOS image
from flash memory."

??

So I hope someone can help me with this problem.

Greets



.

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