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Old 07-11-2019, 11:57 PM   #1
elecEng18
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Default Accesport v3 - any way to revert without the AP?

2018 sti, stock, as a daily driver. AP is just for logging for now. My concern is that if the hardware (AP) fails, especially mid-flush, it will brick the ecu...

Yes, the AP can be warrantied, the ecu reset or replaced, etc. But it takes time. So more of a general question: does anyone know of a simple (read "cheap" ) alternative to the APv3 for flushing back to stock ecu.

Would be nice to backup the stock image onto a harddrive, to load with any of the open-source tools out there. Im thinking of a laptop + obd2 cable.

From all i read, only the original AP, from Cobb, can revert to stock ecu.. Not only, but if the dealer does a flush on top of a married AP, it could render the AP useless.

Any thoughts?...
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Old 07-12-2019, 01:29 AM   #2
GlarryHoodDIT
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First off its flash not flush. Nobody flushes ECUs they flash them.

You seem to very worried about something incredibly unlikely happening, why are you so worried? 10,000s of APs have been successfully installed and maybe a handful have had this problem. The chances of this happening to you (provided you follow the onscreen instructions) is essentially nil.

If you have an Accessport installed the only way to go back to stock is to uninstall the Accessport. You can also utilize Open Source tuning through a website like RomRaider. You cant do both, one or the other they are not mutually compatible.
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Old 07-12-2019, 07:51 AM   #3
elecEng18
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Quote:
Originally Posted by GlarryHoodDIT View Post
First off its flash not flush. Nobody flushes ECUs they flash them.

You seem to very worried about something incredibly unlikely happening, why are you so worried? 10,000s of APs have been successfully installed and maybe a handful have had this problem. The chances of this happening to you (provided you follow the onscreen instructions) is essentially nil.

If you have an Accessport installed the only way to go back to stock is to uninstall the Accessport. You can also utilize Open Source tuning through a website like RomRaider. You cant do both, one or the other they are not mutually compatible.
Well, I've seen too many things fail in development, catastrophically, and know how long it can take to debug and restore.. but point taken, a slim chance in this case.

Flash makes sense )

I think RomRaider is it. Just need a Tactrix openport.
http://romraider.com/index.php/Docum...GettingStarted

"
How does RomRaider allow me to tune?

You must first retrieve a copy of your ECU’s image from your vehicle by using an additional program called EcuFlash (discussed below). A special cable, manufactured by Tactrix, is used to connect your laptop to the OBD-II port in your car (which is located below your steering wheel). Once a copy of your image (also known as a ROM) is downloaded from the vehicle’s ECU to your computer, you can then use RomRaider to make tuning changes to this ROM. Once you’ve finished with your changes, you can then save a copy and transfer this edited image back to your vehicle’s ECU in a process known as flashing. As long as you keep a back-up copy of your original image, you can revert back to it at any time. In addition to tuning, RomRaider also allows you to data log your Subaru to monitor the results and safety of your tune.
"

But why incompatible? With a married AP, couldn't i hook an openport to flash the ecu back to stock, assuming i downloaded the image earlier?

Thank you for the quick response btw!
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Old 07-12-2019, 01:27 PM   #4
Ivan1
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You can brick your ecu even with open source thru a tactrix can you not?
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Old 07-12-2019, 02:26 PM   #5
GlarryHoodDIT
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^^^Yes you can, and there is much less leeway and potential for problems doing Open Source flashes.

Your AP cant read Open Source maps, it can only read Accessport maps. When you flash an Accessport to your car you have to flash a map along with it- you cant monitor the stock tune with an Accessport. Think windows vs apple proprietary apps. Now, when you flashed your AP to your car your either flashed a simulated stock map (stage 0) or a stage 1 OTS map from Cobb. You can check for yourself on your AP. If you were to reflash an Open Source map on top of what you have already done you will likely get a message from your AP saying it cant communicate with your ECU. If you want to use Open Source you should unmarry/uninstall the Accessport and reflash with Tactrix. Otherwise stick with the AP.
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Old 07-13-2019, 12:36 PM   #6
elecEng18
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Quote:
Originally Posted by GlarryHoodDIT View Post
^^^Yes you can, and there is much less leeway and potential for problems doing Open Source flashes.

Your AP cant read Open Source maps, it can only read Accessport maps. When you flash an Accessport to your car you have to flash a map along with it- you cant monitor the stock tune with an Accessport. Think windows vs apple proprietary apps. Now, when you flashed your AP to your car your either flashed a simulated stock map (stage 0) or a stage 1 OTS map from Cobb. You can check for yourself on your AP. If you were to reflash an Open Source map on top of what you have already done you will likely get a message from your AP saying it cant communicate with your ECU. If you want to use Open Source you should unmarry/uninstall the Accessport and reflash with Tactrix. Otherwise stick with the AP.
Makes sense regarding map uploads. But I do not want to use both, but rather use the AP route, and have the other as a backup. a "restore point" to stock in case the AP fails, while debugging with Cobb.

My understanding that Cobb utilize unused memory space to upload custom Rom, and thus hack the ecu. In this case, can i create a backup image to upload over the APs custom ROM?

Not a problem if it would render the AP useless (and would keep it married to the ecu, so likely $$ to reset by Cobb); this is only in case the AP fails altogether.

I hear if the dealer updates the ecu on top of a married AP the effect is the same, btw... i just want to be able to flash the ecu to stock (dealer) ROM, to keep the car on the road.
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