[Efi332] Where can I find info about 4 layer board

[Steve Ravet]

Part of the reflashing procedure is a seed/key sequence where the programmer requests a seed from the computer, calculates a key based on it, and sends it back to the computer.  If the key is right then the computer "unlocks" itself and allows the loader to run.  This communication happens over the OBD2 bus using the J1850 protocol.
 
One way around this is to reverse engineer the key algorithm.  I've seen descriptions of it, it's not that difficult.
 
Another way around this is to reflash via the BDM port.  With your BDM tools you've probably got everything you need to do this, except for a BDM connector on the PCB itself.  I wrote an article on the gmecm page that describes how to add a BDM connector.  It also comes with reflashing software, but it's a prototype and very slow.  Your own loader, of course, won't use any seed/key algorithms.  You can find the article by going to diy-efi.org, clicking gmecm, then ecm info, then using BDM to dump and reflash.
 
--steve


________________________________

	From: efi332-bounces at diy-efi.org [mailto:efi332-bounces at diy-efi.org] On Behalf Of Darrin Garrett
	Sent: Tuesday, April 18, 2006 1:25 PM
	To: efi332 at diy-efi.org
	Subject: [Efi332] Where can I find info about 4 layer board 
	
	
	I thought the production flashed ECUs had a key or key encryption of some kind that would not allow a production released ECU to be re-flashed.  If I am wrong please let me know because I have a complete software source code for this ECU and it would be great if I could just go to a junk yard and re-flash one of these.  The ones we used to get from Delphi only had a unsecured boot loader and were wide open to being flashed.
	 
	Darrin

	
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