fix broken link

[ljmerza]

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What does this implement/fix? Explain your changes.

fixes broken link to firmware files

Does this close any currently open issues?

Any relevant logs, error output, etc?

(If it’s long, please paste to https://gist.github.com and insert the link here)

Any other comments?

Where has this been tested?

• Board type and hardware version:
• os.uname() output:

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