DB48X firmware, used in open source calculators, will be unusable for residents of California and Colorado starting January 1st, 2027, and 2028 respectively, due to new state age verification laws. The firmware's inclusion in the `LEGAL-NOTICE.md` file explicitly prohibits use in these states, classifying the device as an operating system under the legislation. This change reflects growing legislative scrutiny over software accessibility and age verification requirements.

The ban stems from California's AB1043 and Colorado's SB111670, which require strict age verification for certain software and devices. DB48x, while not implementing such verification itself, falls under the definition of an operating system under these laws. The firmware's maintainers have updated the legal notice to reflect this restriction, effectively blocking access for users in these two states.

The practical impact is significant for hobbyists and developers relying on the firmware. While the change is contained within the open source repository, it highlights the increasing intersection of software development with evolving regulatory frameworks. Users outside California and Colorado can continue using the firmware unchanged.

This development underscores the challenges open source projects face in navigating complex state-level legislation regarding software distribution and accessibility. The ban takes effect in less than two years, prompting users to plan accordingly.