Hi All,

I have an RB493AH. It's been working with RouterOS 6.13. I decided to downgrade to 5.26 but when I clicked downgrade it says something like to shutdown, then I click yes. Now, it's not working. There's a strange fast beeping sound and the initialization keeps on looping. The router is now inaccessible via winbox but the ports will lit up when a cable is connected.

Is there a way to revive this device?
I have tried the reset button by shorting with a metal and a button right next to the PoE port to no avail.

Hi there.
Look here.
http://wiki.mikrotik.com/wiki/Manual:Netinstall

I had the same issue awhile ago and this it the best way to solve it.

I did revived it using the netinstall method.
But i have lost my usermanager data.