Arm Keil technical support provides online and telephone assistance to licensed customers with a valid support and maintenance
contract. This includes installing, configuring and operating the Keil C51, C251, C166, and MDK software (referred
to collectively as the Arm Keil tools) and associated Arm Keil hardware products. We also provide free licensing assistance
to all licensed customers regardless of product expiration or release date.
Questions about the use of third-party IDEs or plug-ins to the Arm Keil tools should be directed to the third-party
supplier where they will be addressed more efficiently.
How to contact technical support
For support communication, Arm uses a web-based support system through support.developer.arm.com. This system files,
tracks and answers all support cases.