rb750r2 not netinstall

hi friends
sorry english me is bad

mu mikrotik rb750r2 downgrade to version 5.26

now ,my mikrotik not boot

i can not netinstall mikrotik
and how can i reset hardware rb750r2

plz help me

plz help me

I can not give you the solution, only an advice: NEVER downgrade a device to firmware older than the one it shipped with.
That hardware did not exist when 5.26 came out, so it is not supported.
But try netinstall on a system where the board is direct connected to a PC by cable, with only a single active network adapter on the PC, and no other devices in the network except maybe a dumb switch.

thanks docmarius

My problem was solved

:smiley: