You know, I bricked my Mikrotik CRS305-1G-4S+IN while doing a FW update and no matter which recovery option I try, it seems fried. Mikrotik support is null. I read this thread and your problem looks similar to mine in some respects and am trying to deduce if your fix is my fix. Nonetheless, If you have a pointer on how to get this FW up again would be appreciated.