Need Help Updating Firmware (2014 Mazda3)

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I have a 2014 Mazda3 and am trying to get Apple CarPlay for it. I've ordered the newer USB hub and I just successfully updated my firmware to version 70.00.100. I am now trying to update to 70.00.367 and when preparing to update I get a "Failure to validate certificate package" screen. Can anyone tell me why or how to fix it? Also, I'm pretty sure I can still get CarPlay with 70.00.100 but can anyone confirm this?
 
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