Remote update error - "Unable to verify Update Package signature"

Hello,

From the moment I've updated DELL OME to 2.2.0.2056 version I'm not able to deploy updates remotely and I always get the error: "Unable to verify Update Package signature"

I mention that I've already used all the three sources available in Catalog Source -> Online Source

- downloads.dell.com/.../catalog.cab

- ftp.dell.com/.../catalog.cab

- ftp.dell.com/.../catalog.cab

and also the option "Skip Signature and Hash Check" in "System Update Task"

The result is the same, cannot update, error: "Unable to verify Update Package signature"

Thanks in advance,

Augustin