Firmware update for Iridium handsets - 24 Apr 2019 24 Apr 2019: Iridium has released firmware updates for its 9555, Extreme 9575 and Extreme PTT satellite handsets. Here is how to update to the latest firmware versions: Iridium 9555 - HT18001 Iridium Extreme 9575 - HL18005 Iridium Extreme PTT - HP18005 Have more questions? Submit a request 0 Comments Article is closed for comments.
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