Software residing on ECUs needs to be regularly updated not only during development but also after production and throughout the vehicle’s lifetime. EB tresos ACO Bootloader enables car makers to securely update the software of Classic AUTOSAR & OSEK ECUs inside a vehicle using a downloading tool, which is connected via a communication bus (Ethernet, CAN, LIN, FlexRay) to the vehicle using the standardized UDS protocol from ISO 14229. This allows car makers to easily update the ECU during software development and add additional features for the application while reducing costs and efforts. EB delivers a fully integrated and tested EB tresos ACO Bootloader that includes a demo configuration on the project hardware/compiler. When ordered, features of the EB tresos ACO Bootloader such as memory mapping and communication identifiers are configured according to project requirements. This enables car makers to execute a complete programming sequence to download an application demo software on delivery of the product.