AutoTuner One AT One – Personal OBD-II ECU Remote Flasher

AutoTuner One / AT One – Personal OBD-II Remote Flasher Details

One (AT One) is a compact multi-brand OBD-II personal flasher designed for professional tuners who want customers to read and write supported vehicle calibration files remotely using a smartphone. Unlike the professional Tool, each AT One is intended to be linked to one vehicle by VIN.

Main Functions & Features

– OBD-II ECU read and write on supported vehicles

– Customer operates the device using the MyFlasher mobile app

– Supports iOS and Android

– Automatic supported-protocol identification

– Original vehicle/calibration data can be sent directly to the tuner

– Modified calibration files can be delivered back through AT Cloud

– Customer can write the supplied calibration through the OBD port

– Datalogging

– DTC scan and clear

– Built-in customer/tuner communication

– Vehicle, files, datalogs, DTC information and conversation history managed through AT Cloud

– Multiple AT One customers/devices can be managed from the tuner interface

– Unlimited calibration-file exchange with no per-file charge

– Free updates

– No recurring subscription fee for AT One under current terms

– No Master Tool is required to purchase/use the tuner-pack system.

How AT One Works

The professional tuner keeps unactivated AT One devices in stock. When selling one, the tuner verifies vehicle compatibility and activates the unit for that customer.

The customer plugs the AT One into the vehicle’s OBD-II port, installs MyFlasher from the QR-code workflow, and reads the supported vehicle data. The file is automatically transferred to the tuner’s AT Cloud interface. The tuner prepares the calibration and sends the modified file back through the cloud; the customer can then write it to the vehicle using the app.

This makes AT One especially suitable for remote ECU calibration services, where the customer does not need to bring the vehicle physically to the tuning workshop.

One Device = One Vehicle

An important limitation is that one AT One is assigned to one vehicle using its VIN. It is not intended to work like a workshop programmer that is moved from vehicle to vehicle.

Once linked, however, the tuner can exchange multiple calibration files with that customer without a per-file fee. ECU & Vehicle Support

AT One uses OBD protocols derived from JDTL’s professional ecosystem. JDTL says it is progressively bringing its professional OBD protocols to the One platform, so compatibility is continuously expanding.

The current official compatibility database includes manufacturers such as Audi, BMW, Mercedes-Benz, Volkswagen, Škoda, SEAT/Cupra, Bentley, Porsche-related applications, Alfa Romeo, Abarth, Aston Martin, Chevrolet, Cadillac, GMC, Ford, and many additional European, American and Asian brands, depending on the exact engine, ECU and protocol.

Because support changes frequently, the exact vehicle, model, year, engine and ECU should be checked in the live Jdtls One compatibility database before activation.

TCU / Gearbox Support

An important 2026 development is that AT One is no longer accurately described as ECU-only. announced TCU flashing support in April 2026, initially highlighting supported VAG DSG/S-Tronic/PDK applications.

ECU and selected TCU OBD flashing depending on current AT One compatibility.

That wording is safer than claiming universal TCU support.

MyFlasher Mobile App

MyFlasher acts as the customer’s interface. Depending on supported functionality, it provides access to vehicle information, calibration files, read/write operations, datalogs, DTC information and communication with the tuner.

The customer requires an internet connection through Wi-Fi or mobile data for cloud file exchange.

AT Cloud – Tuner Management

The tuner manages AT One devices through AT Cloud. It can show the customer’s vehicle, original and modified files, datalogs, diagnostic information and conversation history. When the tuner uploads a calibration, it is delivered to the corresponding customer’s application.

This makes it possible for one tuning business to manage many remote customers while each customer retains a dedicated AT One for their vehicle.

White-Label / Custom Branding

AT One is deliberately designed for tuners to sell under their own brand. offers branding options, including logo stickers, while larger European tuner packs offer device-logo customization.

That means a tuning company can present the hardware and app experience to customers using its own business branding rather than making  the primary customer-facing brand.

Hardware

The official specifications list the AT One itself at approximately:

74 × 50 × 26 mm

Protective case:

110 × 135 × 35 mm

The enclosure uses nylon/fiberglass construction and an indicator