ES450 firmware update error


Tried updating firmware on a particular ES450 from 4.5.1 to 4.9.3. At first, I did this via ALMS to several ES450s running 4.5.1 and all of them updated successfully except this one. As a workaround I tried updating the firmware from ACE Manager but I kept getting the error “Could not find file swinstaller in package.” I tried updating to 4.9.2 and 4.8.1 first to see if it would make a difference, but I still got the same error.