Trying to donwgrade from v11.2.1 to v10.2.2 (on a BIG-IP 6900 system), the appliance does not boot correctly.

Hello all,   I am new here.   I tried to downgrade my system from v11.2.1 to v10.2.2. After changing the boot location, the system rebooted but it seems that it is stucked in a reboot loop. Th...