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Please follow the steps below to upgrade to the latest SoftNAS release from the UI.

1. Ensure that both nodes are in sync by forcing the event through SoftNAS StorageCenter. Sign in to each node of the HA pair to be upgraded in separate browsers to more easily switch between Instances. This can be confirmed from Instance A on UI under the SNapReplicate menu. It should read SNAPREPLICATE-COMPLETE on all volumes
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2. Next, In the SoftNAS StorageCenter In the SoftNAS StorageCenter interface for Instance A, navigate to the SnapReplicate / SNAP HA menu. Click Action and then Replicate Now as shown below to perform a quick 1 minute replication cycle. When finished it should read SNAPREPLICATE-COMPLETE on all volumes
   
   
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3. Next, Deactivate SnapHA 
   
4. Next, In the SoftNAS StorageCenter interface for Instance B, navigate to Settings > Software Updates > Apply update now
   
   
5. Once update complete successfully, In the SoftNAS StorageCenter interface for Instance A, navigate to the SnapReplicate / SNAP HA menu, activate SnapHA and allow replication to come to  SNAPREPLICATE-COMPLETE on all volume(s) again.
6. Next, In the SoftNAS StorageCenter interface for Instance B, navigate to the SnapReplicate / SNAP HA menu. Click Action and then Takeover as shown below to switch over the NAS services from Instance A to Instance B
   
   
7. Next, please repeat step  #4 on new target (Instance A) 
8. Once update complete successfully, In the SoftNAS StorageCenter interface for Instance A, navigate to the SnapReplicate / SNAP HA menu, Activate SnapHA 
   
9. Test NAS access
   
   
10. Done