Some devices supported by sigrok need a firmware to be uploaded before the device can be used.
Getting non-distributable firmware files
Most firmware files are non-free and we have no permission to (re-)distribute them.
For these devices, please check the respective device wiki page (see Supported hardware for the full list). Usually there are instructions how to extract the firmware file(s) from vendor software, vendor webpages, from USB logs, or using other means.
Getting distributable firmware files
For some (but not all) devices there are publically available and redistributable firmware files in the sigrok-firmwares git repository (i.e., the vendor was kind enough to allow redistribution):
Getting open-source firmware files
For Cypress FX2 based logic analyzers, we have the fx2lafw firmware (GPL'd) which you can use.
See the fx2lafw page for details.