Hi Maryam ESSAMLALI,
I noticed the issue which you are running into. T300 is very much supported on the 9.9 version you are running on Zd1106 so you got everything right apart from the fact that something went wrong during the upgrade process due to corrupt firmware file possibly and thats not your fault.
Steps to correct this:
1. Reupgrade the ZD using the same file which you used to upgrade it last time. If it works, all good.
2. If it does not work, then download a new or fresh copy from support site and re-upgrade it.
if above ones does not work then please get in touch with Support to sort this out.
Old thread on similar topic - https://forums.ruckuswireless.com/ruc...
Hope this helps: