Sena Spider ST-1

After upgrading my Sena Spider ST-1 to firmware version v.2.0.5
I cannot hear anything and cannot say anything in exchange with my second Sena Spider ST-1 with firmware version 1.1.6 and vice versa.
They connect each other but voice doesn't come not over, whether from the newer version or the older version. I did a factory reset on the one with the v.2.0.5, but doesn't change anything. 


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