Flashing

Flashing a Calibration
Flash Recovery
Cloning an ECU
Flash Support Table

Flashing a Calibration

Introduction

2023+ WRX MT Users
If you are using Atlas 2024.4 or earlier, recovery is not possible on these ECUs. Atlas 2025.1 and later resolves this issue upon first programming with the ECU.

In order for a calibration (tune) to be recognized completely by a vehicle, you need to transfer and permanently store it in the vehicle's flash memory, or ROM. For this to take place, you need to instruct Atlas to perform the "flashing" process with the vehicle. Flashing is an easy process, but it is possible for it to fail if careful steps are not taken. Please ensure the following is true for your scenario:

The vehicle has ample battery capacity remaining to supply the electrical system in your vehicle for at least 30 minutes (we recommend turning off headlights/auxiliary electrical components) - don't try to flash a vehicle if it hasn't been started and driven for a long period of time (allowing the alternator time to charge the battery again).
Your laptop/computer/etc. has ample battery capacity as well to avoid shutdown for at least 30 minutes.
The vehicle is parked, stationary in a safe location such that anything to go wrong, recovery procedures can be run without interruption.
Ideally, is connected to a high-amperage battery charger supplying the battery itself with current. Flashing will work without a battery charger connected, but we strongly recommend using one whenever possible to avoid flashing interruptions that can cause your ECU to enter recovery mode.
The connection you can make with the OBDII port is firm and does not risk being accidentally unplugged with your position in the vehicle (i.e. shifting, moving around) and how it relates to any wires running to the OBDII port.

Vehicle Connection

To reflash, Atlas needs to be connected to the target vehicle. Please see our supported adapter page for full details.

Tactrix OpenPort 2.0 "Connection failed" Error

Sometimes, the OpenPort 2.0 can lose sync with the computer running Atlas. Make sure you always first connect the adapter to your computer running Atlas. Then, connect the OBD2 end of the Tactrix to the vehicle's OBD2 port, often located underneath the trim in the steering wheel area. Doing this in the reverse order can sometimes cause the Tactrix to incorrectly synchronize with your computer and Atlas.

Procedure

Atlas does not support reprogramming ECUs that are actively programmed by other 3rd-party, aftermarket tuning products in order to respect and honor their confidentiality agreements with their customers. Please "unmarry" the ECU from the aftermarket solution first, in order to return it to a factory state, before proceeding.

Make sure the vehicle is in its "Accessory Mode" mode, with the engine not running, but the gauges active. You may see a Check Engine light in this mode.

For key ignition vehicles, turn the key to the "ACC" position to enter this mode.
For push-to-start vehicles, push the ignition button twice with no pedal input (Clutch or Brakes) to enter this mode.

First, make sure you have selected your desired calibration to flash by selecting it in the Active Calibration dropdown menu in the upper-right part of Atlas. Then, click the Flash button,

After a brief period, you will be greeted with this prompt,

Make sure the Calibration listed is the one you want to flash
Make sure the Vehicle listed is the one you want to flash
If you are flashing a new tune, we strongly recommend checking Reset Learned Parameters.

There is no turning back or any chance to interrupt the reprogramming once you click Yes. Make sure you are positive before continuing with reprogramming!

The flash data will be reprogrammed to the ECU. Typically, for fast flashes, this can take anywhere from 10 seconds to 5 minutes. Depending on your adapter's capabilities and speed, this may take longer. If necessary, Atlas will automatically enter Recovery Mode to recover the ECU with the selected calibration, and the process may start over.

Once the process completes, you will be greeted with the Reprogramming Complete screen:

Turn off the vehicle's ignition in order to completely shut down the vehicle. Click OK.

Atlas will now be waiting for the vehicle to return to its Access mode it was previously in. Allow the vehicle 10 seconds to fully shut down any internal electrical components that may still be in a flashing state, and return the vehicle to Accessory mode.

Atlas will then clear any non-persistent diagnostic trouble codes (DTC) that were accidentally tripped by any vehicle components during the flashing process, and the flashing process is complete!

Fast Flashing

Atlas supports "fast flashing" a vehicle, but only if the target ECU supports this. If the vehicle supports fast flashing, this will automatically take place.

Fast flashing, in most cases, will apply to any programming event with the vehicle, including first programming (sometimes referred to as "marriage").

Recovery Mode

For more details on following through with a recovery process, see our flash recovery procedures page.

Description

Most vehicles have a manner in which you can recover the ECU should the flashing be incomplete. For the Subaru WRX (2015+), for example, your bootloader (never reprogrammed by Atlas) has logic which runs on start that will attempt to see if the flash had been correctly programmed. It does this by looking at the first and last sections of your programmed ROM to see if certain data it expects to be present are in place. As flash data is sent in a ordered fashion, it is unlikely that both sections will ever be correct if the reprogramming is ever interrupted. If these sections are not correct, your ECU will enter recovery mode. In recovery mode, your ECU cannot operate the vehicle, but instead is waiting for a new ROM to be uploaded.

If, for example, power is lost to the ECU while flashing (low battery/etc.), this is the mode you will more than likely end up in. If Atlas fully supports your vehicle and your ECU also has a recovery mode that Atlas can interact with, Atlas will handle interacting with your ECU in this recovery mode.

Bricked ECUs

Please first see our flash recovery procedures page, as Atlas 2025.1 and later ships with a brick protection feature in most supported models. It is exceedingly difficult to truly brick an ECU with Atlas.

Please reach out to NAMR if your ECU is "bricked", or in other words it cannot communicate when recovery mode is expected. We offer a service to attempt recovery on capable ECUs in this more challenging state with specialized tooling at merely the cost of shipping as a courtesy to support our community.

Flash Recovery

Introduction

Description

Bricked ECUs

Atlas Recovery Feature

Due to the nature of the Atlas brick protection feature, CAN bus devices on the car will not be able to communicate with the ECU and will likely light up your car's dashboard warning lights like a Christmas tree. This is fine, and should resolve after a complete flash and key cycle.

Supported Models:

Subaru USDM 2022 WRX MT
Subaru USDM 2023 WRX MT

Atlas 2025.1 now ships with a brick protection feature. Due to its position within the bootloader, this feature is always accessible, even if the programming was incomplete or the tune contained bad code. Atlas will always try to reprogram the bootloader first, so even if it was your first time flashing the vehicle and it has ended up bricked, there is a good chance the feature is already installed.

To access this feature on an ECU that has been flashed previously by Atlas , first turn off the vehicle. Then, press and hold the Cruise Cancel switch on your steering wheel. Wait approximately 30 seconds. While holding this button, enter accessory mode:

For key ignition vehicles, turn the key to the "ACC" position to enter this mode.
For push-to-start vehicles, push the ignition button twice with no pedal input (Clutch or Brakes) to enter this mode.

The Cruise Cancel button can now be released.

This will activate an Atlas recovery feature in your ECU's bootloader, and the ECU will immediately enter recovery mode. At this point, you can follow the procedures in this document. This feature can be activated at any time under any circumstances as long as the vehicle has battery power. To cancel this recovery mode if the ECU is not bricked, simply key cycle the car.

If the above does not work and you have flashed the ECU with Atlas before, it is possible either the bootloader is truly bricked (see Unusual Circumstances).

Unusual Circumstances

Procedure

To enter Recovery Mode in Atlas, use the main menu to click Help -> Enter Recovery Mode.

You will be asked what vehicle is being recovered; select it from the list and click OK,

First, make sure you have selected your desired calibration to flash by selecting it in the Active Calibration dropdown menu in the upper-right part of Atlas. Then, click the Flash button,

You may be asked again which vehicle is being recovered; select the vehicle again from the list and click OK.

After a brief period, you will be greeted with this prompt,

Make sure the Calibration listed is the one you want to flash
Make sure the Vehicle listed is the one you want to flash
If you are flashing a new tune, we strongly recommend checking Reset Learned Parameters.

There is no turning back or any chance to interrupt the reprogramming once you click Yes. Make sure you are positive before continuing with reprogramming!

Once the process completes, you will be greeted with the Reprogramming Complete screen:

Turn off the vehicle's ignition in order to completely shut down the vehicle. Click OK.

Atlas will now be waiting for the vehicle to return to its Accessory mode it was previously in. Allow the vehicle 10 seconds to fully shut down any internal electrical components that may still be in a flashing state, using the ignition key or push-to-start button, once again return the vehicle to Accessory mode.

Atlas will then clear any non-persistent diagnostic trouble codes (DTC) that were accidentally tripped by any vehicle components during the flashing process, and the flashing process is complete!

Cloning an ECU

Introduction

In order to avoid risking damaging or "bricking" your OEM ECU, you may instead choose to clone your OEM ECU to another, spare ECU that you have purchased. However, you will run into issues with this without cloning the ECU, as the OEM ECU in your vehicle has keys that permit the ECU to authorize with your electrical system. One of these keys is the key used for immobilizer authorization. Without at least these keys in agreement, the vehicle will not start. This documentation page assumes you have an OEM ECU that is correctly trained/paired to the vehicle from factory (or a dealership/service specialist) as a cloning source, and a spare ECU to clone to.

Cloning an ECU involves downloading the region of memory in your ECU that holds these authorization keys. This section is smaller than and separate from your calibration (or tune) and is called EEPROM. You can download an EEPROM file and save it for later, or upload it to another ECU immediately after downloading it from the factory ECU.

Atlas does not support cloning or reprogramming ECUs that are actively programmed by other 3rd-party, aftermarket tuning products in order to respect and honor their confidentiality agreements with their customers. Please reach out to the vendors supplying those products to clone and support those modified ECUs, or "unmarry" the ECU from the aftermarket solution first before proceeding.

Cloning is relatively easy, but please ensure the following is true for your scenario:

The vehicle has ample battery capacity remaining to supply the electrical system in your vehicle for at least 30 minutes (we recommend turning off headlights/auxiliary electrical components) - don't try to flash a vehicle if it hasn't been started and driven for a long period of time (allowing the alternator time to charge the battery again).
Your laptop/computer/etc. has ample battery capacity as well to avoid shutdown for at least 30 minutes.
The vehicle is parked, stationary in a safe location such that anything to go wrong, recovery procedures can be run without interruption.
Ideally, is connected to a high-amperage battery charger supplying the battery itself with current. Flashing will work without a battery charger connected, but we strongly recommend using one whenever possible to avoid flashing interruptions that can cause your ECU to enter recovery mode.
The connection you can make with the OBDII port is firm and does not risk being accidentally unplugged with your position in the vehicle (i.e. shifting, moving around) and how it relates to any wires running to the OBDII port.

Vehicle Connection

To reflash, Atlas needs to be connected to the target vehicle. Please see our supported adapter page for full details.

Tactrix OpenPort 2.0 "Connection failed" Error

Step 1: Downloading EEPROM

First, ensure the OEM ECU is connected to the vehicle. If it is not, disconnect the battery before replacing and installing the OEM ECU. Reconnect the battery after physically reinstalling and fully reconnecting the ECU.

Then, using the main menu in Atlas, click ECU -> Download Section:

You will be asked which section is being downloaded. Select EEPROM, and click OK:

The EEPROM will be downloaded from the ECU, please wait for this to finish.

When the process has completed, save the downloaded binary data to a file on your computer:

Step 2: Uploading EEPROM

Ensure the spare ECU is connected to the vehicle. Disconnect the battery before replacing and installing the spare ECU. Reconnect the battery after physically reinstalling and reconnecting the spare ECU.

Then, using the main menu in Atlas, click ECU -> Flash Section:

Select an EEPROM binary file that was previously downloaded from another ECU:

You will be asked which section is being uploaded. Select EEPROM, and click OK:

The EEPROM will be uploaded to the ECU. Wait for the process to finish:

Once the process completes, you will be greeted with the Upload Complete screen:

Turn off the vehicle's ignition in order to completely shut down the vehicle. Click OK.

Flash Support Table

Atlas Flash Support

USDM WRX Manual Transmission Support

Vehicle Year, Market, and Model	Flash Support See: Flashing Page	Recovery Support See: Flash Recovery	"Brick" Recovery Support See: Flash Recovery
2015 USDM Subaru WRX MT	Atlas 2025.1 or later	Atlas 2025.1 or later	In Progress
2016 USDM Subaru WRX MT	Atlas 2025.1 or later	Atlas 2025.1 or later	In Progress
2017 USDM Subaru WRX MT	Atlas 2025.1 or later	Atlas 2025.1 or later	In Progress
2018 USDM Subaru WRX MT	Atlas 2025.1 or later	Atlas 2025.1 or later	In Progress
2019 USDM Subaru WRX MT	Atlas 2025.1 or later	Atlas 2025.1 or later	In Progress
2020 USDM Subaru WRX MT	Atlas 2025.1 or later	Atlas 2025.1 or later	In Progress
2021 USDM Subaru WRX MT	Atlas 2025.1 or later	Atlas 2025.1 or later	In Progress
2022 USDM Subaru WRX MT	Atlas 2024.4 or later	Atlas 2024.4 or later	Atlas 2025.1 or later
2023 USDM Subaru WRX MT	Atlas 2024.4 or later	Atlas 2025.1 or later	Atlas 2025.1 or later
2024 USDM Subaru WRX MT	In Progress	In Progress	In Progress