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I have to say that due to our 'efforts' Garmin has started to protect their devices from flashing patched firmwares. In particular, GCDs for nuvi 24xx, 34xx, 30, 40, 50 are digitally signed. There is a 256-byte signature appended at the end of every GCD. The signature is an encrypted SHA1 hash of GCD contents. I can claim that SHA1 is used, because I've seen it in disassembly. Also I'm quite sure the encryption is asymmetric because long-integer functions are used. So it looks like we can't fake the signature. Now imagine that Garmin digitally signs also RGNs and update.txt&ldr.bin on some new device. The era of easily hackable devices would end.
That's why you'd better think twice before sharing things like UnitID copying.
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Thread: Convert 3790/3760/3750 to 3490
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2nd December 2011, 07:36 PM #1Navigation software Moderator
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2nd December 2011, 07:39 PM #2VIP Master
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It's always a danger to let the Mfg know what you can do with their devices.
Much of the info shown openly may be best served by sharing thru PM's only. But that has difficulties too.
If they shut out the hackers too much, I think their sales may suffer.
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3rd December 2011, 02:01 AM #3Navigation software expert
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It is nine days news! As long ago as this summer I read the one of Garmin bulletin about new 2012 series of Nuvis at one of Western Europe distributor. Garmin declare in it what new series will more closed in variant of SW modification by functions. Also Garmin ask to report about all "modified" device that detect in service points. Especially Garmin ask to indicate the seller of such device. And so on...
Originally Posted by kunix
Kunix! You are not citizen of advanced capitalist country and so must know about real illegal market of software and hardware in your countries. I think our forum is a little bit of Garmin problems. They deal with a frank criminal sellers in much more size. Welcome to East, the brother Garmin, what could i say...Last edited by Giomen; 3rd December 2011 at 02:05 AM.
Garmin, how much is 30 pieces of silver for Judas today? Were they worthy for crucifix of GPSPower?
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