Smartzone 300 is not rejoining the cluster (v5.1) - Error on Join Request - Not all blades are In_Service

[francesco_pollo]

I have two SmartZone 300 (v5.1) working perfectly until recently. But some days ago one of them simply lost its configuration and left the cluster. Yesterday I try to rejoin it, but as you can see in the images, it is not joining the cluster and I don't have any clue.  

I have run the setup and reconfigured all IP as it was before this issue. I see that it is possible to ping the actual LEADER of the cluster. 

I'm sure the cluster's name is right and I'm giving the controller the name they had previously. 

I tried to rejoin it multiple times and I always get this same error (Not all Blades are in service).

I checked the show service and all services are offline. I run the service start command, but it seems not work because all services keep offline. In the Leader I see that the controller tried to Join, but it was not possible. The alarm code is 801, but the description just says to try to rejoin. 

(https://docs.commscope.com/bundle/sz-511-alarmguide-sz300vsz/page/GUID-E0EEA545-619F-4F85-AC4E-894B9...)

Has anyone any experience trying to rejoin a Smartzone that was working in the cluster before or seen this kind of issue?

 Model                           : SZ300
   SZ Version                      : 5.1.0.0.496
   Control Plane Software Version  : 5.1.0.0.447
   Data Plane Software Version     : 5.1.0.0.496
   AP Firmware Version             : 5.1.0.0.595, 3.6.2.0.254