Hi,
I bricked 2 rb 2011 after upgrading to 6.13 and 6.15. After upgrade router became dead. No led lighting after connecting ethernet on 6-10. Reseting bring back the router but only for once after reboot its again bricked. One of them after few reboots starting working. The 2nd one even after downgrading to 5.26 fails to boot. Any resolution for this problem. I forgot to tell netinstall is not able to discover the router.

Hi,
I bricked 2 rb 2011 after upgrading to 6.13 and 6.15. After upgrade router became dead. No led lighting after connecting ethernet on 6-10. Reseting bring back the router but only for once after reboot its again bricked. One of them after few reboots starting working. The 2nd one even after downgrading to 5.26 fails to boot. Any resolution for this problem. I forgot to tell netinstall is not able to discover the router.

It be more fine to write directly to the support@mikotik.com because this is a user to user forum only.
And only they would be willing able to anything in this case.