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for RB450 there are 2 ways for repair it but first we must check if it function and their light is working or not
if no so there are no solution for it we may take back to the seller for replacment
but if they were working so
first we try to reset configuration for it
and if it not working
try to install a new OS with netinstall
Simple reset the router to the default state
I tried many way but the result ultimately 0
you can use netinstall to try installing new OS in it.