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Model S Key fob won’t update to V2

Discussion in 'Model S' started by jones6547, Sep 21, 2019.

  1. jones6547

    jones6547 New Member

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    This week I updated my Model S to the 2019.32.2.2 version of software. I then tried to update my key fobs to V2 per the instructions and both say the are up to date at V1. Anyone having this problem?
     
  2. ucmndd

    ucmndd Well-Known Member

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    How old are your fobs? The update is only for the more recent versions with enhanced encryption.
     
    • Like x 1
  3. BigNick

    BigNick Disaffected Member

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    V1 and V2 key fobs are different hardware; you can't update a V1 fob to V2.
    Most V1 fobs will be up-to-date with respect to software, the V2 hardware fobs can be updated by the car.
     
    • Like x 2
  4. DukeofURL

    DukeofURL Member

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    Does anyone know the cutover production date from V1 fobs to V2 fobs?
     
  5. zanary

    zanary Active Member

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    I think late 2018. I just ordered a new v2 key fob as my third fob. My other two v1 fobs still work.

    Mobile Service came and did it two days ago in about 45 minutes.
     
  6. Shibiwan

    Shibiwan Member

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    Late 2018 is correct for the V2 fobs. They doubled the hash length on the new fobs (which doubled the time needed to decrypt them from 2s to 4s).
     
  7. Darmie

    Darmie Supporting Member

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    Wow, a professional that required 45 min to complete! I guess good to know that fobs not that easy to program.
     
  8. croman

    croman Active Member

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    Yes but as I understand it this update actually uses the 2 40 bit keys like 80 bit.
     
  9. ucmndd

    ucmndd Well-Known Member

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    Some minor points here, as I can’t determine relative position of your tongue and cheek.

    Theoretically, a 40 vs. 80 bit key is a trillion or so times harder to crack (2^40 possible combinations vs. 2^80). That said, with most encryption, the details are in the implementation and it does indeed appear that Tesla’s “80 bit” implementation was to use two 40 bit keys, which is decidedly not the same thing as an 80 bit key.

    This update as I understand it is intended to fix that and implement a true 80 bit key.
     
    • Informative x 1
    • Like x 1
  10. Shibiwan

    Shibiwan Member

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    You are right in that it was a tongue in cheek comment. I should made it clearer with a ;)
     
    • Like x 1
  11. jones6547

    jones6547 New Member

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    Thank you! Is there some advantage to the V2 fob?
     
  12. s1rk

    s1rk Member

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    New fobs are supposed to have better encryption (Makes it harder to hack your key to make clones).
     
  13. Huachipato

    Huachipato Member

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    The issue is, using your formula to explain - that it wasn't initially set up as 2^80. Instead, it was set up as (2^40)*2.
     
    • Like x 1
  14. Tim-in-CA

    Tim-in-CA Member

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    Is Tesla providing the new fobs for free (USA) for V1 customers? Or is there a charge, if so, what is the cost? Thanks!
     
  15. zanary

    zanary Active Member

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    They are not free. Schedule a mobile appointment and they come by and set it up for you.
    I think the costs is around $200 or so. You get to keep your old v1 fob as well and you can have all three provisioned to your Model S if you want.
     
  16. Tim-in-CA

    Tim-in-CA Member

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    Thanks for the info. At this point, I don't think where I park (at home or at work) that I am suspect to key cloning / intercept (as I have seen on video). If I am really concerned, I'll enable pin-to-drive. But, I have a SC appointment this week, I'll ask … it doesn't hurt!
     

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