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Product Assistance

Learning Platform

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 This system files, tracks and answers all support cases.

Submit case

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