Legacy Firmware Migration & Modernization Services

Firmware Code Audit and Reverse Engineering

Effective migrations begin with a comprehensive review of the existing systems such as source code, manufacturing processes, schematics, PCB designs, components, interfaces and issues.

In case some documentation is missing, we recreate significant design features, examine boot process, peripherals, timing, interrupts, memory, protocols and calibration logic.

This discovery stage helps to develop a practical upgrading strategy that retains necessary features while simplifying or replacing obsolete components.

MCU and Hardware Platform Migration

Component obsolescence often leads to firmware migration. Our firm is capable of transitioning systems working with 8-bit, 16-bit, and 32-bit microcontrollers including ARM Cortex-M processors and modern wireless systems-on-chip.

Hardware modifications require more than straightforward software porting because clock circuits, ADCs, power modes, flash storage, bootloader functions, interrupts, timers, DMA, and drivers may function differently.

We verify the differences and implement necessary modifications in printed circuit boards in advance. We also assist our customers in choosing replacement systems taking into consideration the availability, memory, power consumption, vendor support, connectivity features, pricing, and certification requirements.

Bare-Metal to RTOS Migration

Numerous thriving devices usually start off with simple, bare-metal firmware but high needs can change things dramatically.

New features such as cloud connectivity and BLE could lead to timing problems. To bring firmware up to date, we can use FreeRTOS, Zephyr RTOS, or light but effective task architectures when possible.

Crafting an easy-to-maintain architecture requires engineers to take into account timing, RAM and flash visibility, interrupts and power consumption, as well as future needs.

Connectivity and Protocol Modernization

Accordance with the probabilities associated with their initial design, connected gadgets are likely to persist longer than expected.

Added to the mix are the various possibilities available for further enhancing their functionality such as improving BLE connection, Wi-Fi provisioning, MQTT communication, REST API integration, cellular compatibility or connection and gateway communication, as well as making them compatible with another mobile app.

We modernize device connectivity while protecting the user experience and installed base. This may include:

• BLE protocol migration and secure pairing
• Wi-Fi provisioning and reconnection logic
• MQTT, HTTP, WebSocket, Modbus, CAN, UART, SPI, and I2C integration
• Cloud API integration and device authentication
• Gateway-based device communication
• Device telemetry, event reporting, and remote diagnostics
• Mobile app compatibility for iOS and Android

For products already deployed in the field, backward compatibility is a major design concern. We plan migration paths that allow old and new firmware versions to coexist when necessary.

Security, Secure Boot, and OTA Updates

Legacy firmware often lacks the protections expected from modern connected products. A firmware modernization project is an opportunity to introduce security at the device level rather than treating it as an afterthought.

Some of the embedded security measures we help employ are signed firmware images, secure boot, encrypted storage, secure credential usage, cloud communication authentication, setting production keys, rollback protection, and secure OTA updates.

We also design update processes for real-world conditions. Devices may lose power, have unreliable connectivity, or use limited flash memory. A robust OTA implementation must protect the device from incomplete or corrupt updates and provide a safe recovery path.

Test Automation, Validation, and Documentation

Firmware that is contemporary ought to be less difficult to validate than its predecessor systems. We devise a method for testing which can encompass unit testing, hardware-in-the-loop testing, system integration testing, protocol simulation, regression testing, and field testing plans.

We also provide practical handover documentation: architecture diagrams, build instructions, source-code structure, interface specifications, release notes, manufacturing flashing procedures, and support guidance. This reduces future dependency on a single engineer or vendor.