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ArenM authored
`!=` doesn't seem to be the exact inverse of `==`. To prove this I added the following to the udev rules. On a system with the community firmware both COMM_FW and NOT_COMM_FW were set to true, with the quectel firmware only NOT_COMM_FW was true. ATTRS{serial}=="community_fw", ENV{COMM_FW}="true" ATTRS{serial}!="community_fw", ENV{NOT_COMM_FW}="true"
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