Etherchannel failover testing

Hi Guys,
I am trying to test an etherchannel failover and switchback.

I did failover from primary to backup adapter, but now I am not able to switch it back to primary.

phcxxxxx:/ > entstat -d ent4 | grep Active                                         
Active channel: backup adapter                                                       
                LACP activity: Active                                                
                LACP activity: Active        

phcxxxxx:/ > /usr/lib/methods/ethchan_config -f ent4
phcxxxxx:/ > errpt | head                                                          
IDENTIFIER TIMESTAMP  T C RESOURCE_NAME  DESCRIPTION                                 
DC32143C   0618171313 P H ent4           PING TO REMOTE HOST FAILED                  
8650BE3F   0618171213 I H ent4           ETHERCHANNEL RECOVERY                       
DC32143C   0618165413 P H ent4           PING TO REMOTE HOST FAILED                  
6169289D   0618165413 P H ent4           PING TO REMOTE HOST FAILED                  
DC32143C   0618165413 P H ent4           PING TO REMOTE HOST FAILED                  
6169289D   0618165413 P H ent4           PING TO REMOTE HOST FAILED                  
DC32143C   0618165413 P H ent4           PING TO REMOTE HOST FAILED                  
6169289D   0618165313 P H ent4           PING TO REMOTE HOST FAILED                  
DC32143C   0618165313 P H ent4           PING TO REMOTE HOST FAILED                  
phcxxxxx:/ >                                                                       

phcxxxxx:/ > entstat -d ent4 | grep Active                                         
Active channel: backup adapter                                                       
                LACP activity: Active                                                
                LACP activity: Active    

So it is still showing active channel as backup adapter.

Let me know any troubleshooting on this.
Thanks

---------- Post updated at 07:42 PM ---------- Previous update was at 07:39 PM ----------

here is that blue line which is not showing properly in previous post:

phcxxxxx:/ > /usr/lib/methods/ethchan_config -f ent4

Any new entry (maybe complaining about failed recovery) in the errpt after your last forced failback?
Is the primary adapter available for sure?