Overwrite HPT custom OS

[limited cv8r]

I understand a PCM with a HPT custom OS will show up as locked. Question is can I overwrite this with a full flash from Efilive. This is a LS1 PCM.

[macca_779]

I understand a PCM with a HPT custom OS will show up as locked. Question is can I overwrite this with a full flash from Efilive. This is a LS1 PCM.

No you can't mate. HPT changes the key automatically when applying their custom OS on LS1's. It's a pain in the arse.


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[GMPX]

It's amazing how many HPT users are not aware of that 'feature'. Not real good when there is shops out there who don't lock PCM's (knowingly).

[limited cv8r]

So I guess I will be sending another parcel to GMPX.

[GMPX]

Check it first, you never know, because now that I think about it, I don't think the auto lock is mandatory, the user has to Disable it, rather than Enable it.

[limited cv8r]

I tried to read this PCM already,I get the unrecognised or locked PCM message,use alt keys will show a seed but end up same result. This car has previosly been tuned mafless, that's why I'm assuming its either locked or HPT custom OS.

[kangsta]

if it is HPT custom os for LS1B they have a different seed key algo for the custom os and a different one again for actually locking it. So to any other software its always locked. To their software it can be locked or unlocked.

[kangsta]

you can tell by the os number if its one of their custom os

[Ryan W.]

Can the GM dealer flash it back to stock?

[GMPX]

if it is HPT custom os for LS1B they have a different seed key algo for the custom os and a different one again for actually locking it. So to any other software its always locked. To their software it can be locked or unlocked.
That doesn't make sense, it's either locked or it's not. I hear it all the time from people that the tuner says he didn't lock the PCM but they can't read or write to it. What would be the point of using a different seed/key algo on a custom OS if their (anyone with HPT) can unlock it?


Can the GM dealer flash it back to stock?
No.

[kangsta]

That doesn't make sense, it's either locked or it's not. I hear it all the time from people that the tuner says he didn't lock the PCM but they can't read or write to it. What would be the point of using a different seed/key algo on a custom OS if their (anyone with HPT) can unlock it?



Why doent it make sense? There are different algos to calculate the 'right' key. I expect their reasoning is that by using non GM algo for their os they could stop most people reading out a PCM and flashing it into another one using a 3rd party tool.

For their own software they can have a different algo again based on the interface serial for example so amongst the HPT users if it's not 'locked' anyone can read and modify with their HPT cable and if it is locked another HPT user wont be able to read it.

[GMPX]

So what you are saying is there is three potential valid keys on a HPT COS?



Stock (Unlocked).
COS algo, so the standard GM algo won't work, but it will read with any HPT cable using their different COS algo.
Totally locked, nothing can read or write to the PCM.


Cheers,
Ross

[macca_779]

So what you are saying is there is three potential valid keys on a HPT COS?



Stock (Unlocked).
COS algo, so the standard GM algo won't work, but it will read with any HPT cable using their different COS algo.
Totally locked, nothing can read or write to the PCM.


Cheers,
Ross

That's how it is Ross. Got me stuffed why they do it.

Would be awesome if you guys incorporated their algo into the alt keys. But I do realise short of them handing it over its not a straight forward thing to do. Alas you guys are very smart I'm sure you could do it.


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[kangsta]

yes but.....


So what you are saying is there is three potential valid keys on a HPT COS?



Stock (Unlocked). not on LS1B COS
COS algo, so the standard GM algo won't work, but it will read with any HPT cable using their different COS algo. yes
Totally locked, nothing can read or write to the PCM. only the HPT tuner cable that locked it can unlock/read/write


Cheers,
Ross

[GMPX]

Would be awesome if you guys incorporated their algo into the alt keys.
Reverse engineering HPT to figure their custom algo sounds like a pretty bad idea to me, we would never try something like that.

[Tre-Cool]

Reverse engineering HPT to figure their custom algo sounds like a pretty bad idea to me, we would never try something like that.


13354

perfect picture. :-)

[macca_779]

Reverse engineering HPT to figure their custom algo sounds like a pretty bad idea to me, we would never try something like that.

Lol I'm sure. But seriously do it anyway.


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[GMPX]

13354

perfect picture. :-)
OK, my serious face on (as it was before)............No we won't reverse engineer their software.


Lol I'm sure. But seriously do it anyway.
Go right ahead, let me know when your day in court is :ermm:

[limited cv8r]

Would J2534 work or does that also use a seed key.

[kangsta]

everything that talks to the PCM through OBDII port uses seed/key

[macca_779]

OK, my serious face on (as it was before)............No we won't reverse engineer their software.


Go right ahead, let me know when your day in court is :ermm:

They really would be petty to go to those lengths. You guys do after all do it to a massive corporation like GM.

Be like a crook stealing from another crook and then the first crook suing the second. But the owner not caring.


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[GMPX]

They really would be petty to go to those lengths.
They sued Powerchip many years ago, not sure what it was over though, I guess if they were copying or bypassing licensing then that is bound to happen and will no doubt happen again should something similar pop up elsewhere.