I would configure the 9300L as the root bridge for all VLANs as i see it is your main switch spanning-tree vlan 1-4094 root primary Also enable BPDU Guard and Loop Guard on the trunk ports to prevent loops from causing network instability.  Enable BP...

  This was discussed here. Seems hitting control + break in less than 5 seconds does the trick https://community.cisco.com/t5/other-network-architecture-subjects/password-recovery-functionality-is-disabled/td-p/2973976

I was responding to jaheshkhan Possible on 90 days evaluation. Not sure why he doesn't have 14 subscription. Again not sure if he meant no support contract on the version 11 but he has subscription for version 14.

Please provide these output: show spanning-tree detail | include ieee|occurr|from|is exec show spanning-tree summary  

PCD would be the best option. However, since you don’t have a support contract, your option is to do the painstaking manual migration using BAT. However, It is very advisable to get a support contract.Consider using BAT (Bulk Administration Tool) to ...