Firmware update for Iridium handsets - 8 Dec 2021 8 December 2021: Iridium has released firmware updates for its 9555, Extreme 9575 and Extreme PTT satellite handsets. Here is how to update your equipment to the latest firmware versions: Iridium 9555 - HT21001 Iridium Extreme 9575 - HL21001 Iridium Extreme PTT - HP21001 Have more questions? Submit a request 0 Comments Article is closed for comments.
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