Did you have the TWRP version (3.1.1-0, I think) installed that Fairphone had included with Fairphone OS 19.08.1 (and earlier versions of Android 7 including 19.02.x) or had you updated TWRP to a higher version? Higher versions sometimes caused these issues.
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I tried three different USB cables, and three different USB ports on my PC, none of which worked. As a last resort, I tried using my husband’s laptop - and it worked! This makes me suspect maybe it was driver trouble, even though my PC insisted that the driver was installed and up to date. Thanks so much for the help.
Some Android ROMs include a feature to block devices from accessing the phone. Maybe it has happened accidentally with your PC.
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