Howto Reset RB450G has been hacked,can't netinstall

Can’t Reset & Netinstall.

help me please!
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Unfortunately, your image links are broken - I can just see a placeholder :frowning:
Would you try it with a different image service?
-Chris

ok. I edited it.

Lucky you your system has a serial port.
Take a look here on how to either reset the config or NetInstall it:
https://wiki.mikrotik.com/wiki/Manual:Netinstall#OPTIONAL:_Configuring_RouterBOARD_with_COM_port

-Chris

Same kind of attack as: http://forum.mikrotik.com/t/mikrotik-device-has-been-hacked-and-the-hack-script-disable-many-things-cant-netinstall-what-should-i-do/114904/1

The other person had no firewall and admin user on the public interface. Simple brute force on SSH will let anyone in.
Everyone, please, configure your device like this to resolve this issue: https://wiki.mikrotik.com/wiki/Manual:Securing_Your_Router

but my router not show “reformat-hold-button”

You don’t need it. Use a serial cable and follow the instructions from the link I posted.
-Chris