If LineageOS is working now, and fastboot mode is still without indication, then the modem files on this particular Fairphone 2 are outdated, and LineageOS will not update them.
I mean, even the latest available modem files are old now, but at least there are more current ones then pre-19.02.1, here’s the link again … and the 19.02.1 files for instance fixed a noticeable bug, apart from introducing fastboot mode indication.
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