Version 2.5.2 has been released to fix the install issues. Users running 2.5.1 or below should look to upgrade to the version-v2.5.2 or latest tags.
There is a known issue with the Heimdall 2.5.0 and 2.5.1 releases causing broken installs for some users. If you are experiencing issues please roll back to the version-v2.4.15 tag until a fix can be published. We will update this post as necessary.
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