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I have read several articles and posts on the issues with updating PCM on a 997.1 with the original software version. I have a 2005 Carrera with 6spd manual. Is has navigation , Bose audio, no telephone option. I had the original software and chose to update it. I purchased the discs from Porsche and sourced a later model Bose amplifier just in case. Sure enough the original Bose amplifier froze when I initiated the software update. After replacing the amp I successfully updated the software and loaded the latest version of the maps. Before the update the date shown on the main screen was not accurate. After the update the date does not show at all on the main screen. T,he GPS seems to work fine updating the time etc. I have tried to reset the system but the date still does show at all. I realize this is a minor issue but thought I would add this post and see if anyone has any suggestions

thanks in advance for any assistance

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I 'think'this is related to the GPS rollover that happened recently. There are only so many weeks in the GPS file structure, the field that contains the week number is a 10-bit binary number. This limits the range of the week number to 0 – 1023, or 1024 total weeks.

GPS week zero started January 6, 1980. The 1024 weeks counter ran out and rolled over on August 21, 1999. The week counter then reset to zero, and it has been recounting ever since. The next rollover to zero was on April 6, 2019.

Units need a firmware update.

Porsche have deleted the date when you update the software as a work around.


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Initially I believed this as I lost the date around Jan 2 2019. But after meeting up with many other 997 owners they have the correct date displayed. Recently my time will not stay sync'd. I'm betting my PCM is starting to fail and its not related to the GPS rollover.

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you probably saw this.  while I did not replace anything, this is what happened to me.



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