Bootloader Error

[Cougar281]

When mine was wiped last week, there was no key at all shown. Since my ECM had just come from a boneyard, I've already sent it back or I't try that. I've since gotten another one that works.

Johnboy, with the right knowledge and tools, it is probably possible to fix, but not with EFILive or a TechII. The options are pretty much a new ECM or send it to EFILive for them to remove the chip and reporgram it (I'm 95% sure that Ross and Paul can or will do that).

If you ever suspect the ECM has had its seed key erased please try one of two things:

1. Try checking the "Use Alt keys" check box.
or
2. Try entering a value of $FFFF for the key.

When the seed/key gets wiped (by a bug in GM's TIS) the value of the seed and key get set to Seed=$FFFF and Key=$FFFF. Since flash memory erase value is $FF.

You can tell if the seed/key has been wiped because when EFILive displays the seed (just before attempting to unlock the ECM) it will show the seed value as $FFFF.

Regards
Paul

[McRat]

Truck runs and drives. I can log, read codes, and erase them. The ECM is not fried it just scrambled somehow.


That pretty much says it.

I can not get the stock file out of it to do a full flash. Any chance I can do forced flash of the OE software with a Tech II?


Thanks Paul. I tried the Alt Keys trick yesterday. No luck. No luck with the $FFFF key today either.

This is my brother-in-laws truck. All we want to do is shut of the EGR insufficent follow error to put out the CEL. He has an EGR blocker plate installed. I am thinking that to a tick from Fingers or an different ECM is going to be needed. Unless someone has more ideas to try.

Try any file as FULL FLASH that the O/S matches. I have only used the stock tune.

[Cougar281]

Try any file as FULL FLASH that the O/S matches. I have only used the stock tune.

Won't work. Seed and key are gone. The console log Johnboy posted is the exact same one I had, and I verified that the seed didn't exist via another method. Since the seed and key are gone, NOTHING will write to it. You'd need to take apart the ECM, pull the chip and flash it via another method to recover it. Would be MUCH easier to get a new ECM.

[GMPX]

What would be nice is to get hold of one of these ECM's, pull the chip and see exactly what the ECM is defaulting the values to. It might be a common number, I mean, computers can't think, it has to know to put something in there.
If we knew the seed/key that everything defaulted back to it might make life easier.

Cheers,
Ross

[McRat]

How many combinations x test time? Perhaps a "utility" for unlocking PCM's through brute force could be made?

[fire0021]

that would be nice

[Blacky]

How many combinations x test time? Perhaps a "utility" for unlocking PCM's through brute force could be made?

10 days for CAN based vehicles.
4 days for VPW based vehicles.

Regards
Paul

[McRat]

Not exactly a roadside repair.

[GMPX]

No, plus it means given the patience anyone could read YOUR tunes. Best sweep that option under the rug....

Cheers,
Ross

[McRat]

That works out PERFECT!


I have no patience, and I don't lock tunes.