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Flash progress bar message incorrectly displayed · Issue #1265 · betaflight/ betaflight-configurator · GitHub
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Configurator doesn't properly error when flashing firmware that is too big. · Issue #1682 · betaflight/betaflight-configurator · GitHub
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Fix any STM32 DFU Drivers issues when flashing Betaflight/Cleanflight firmware - Guides - DroneTrest
What to do if your flight controller can't connect to the Betaflight configurator or can't flash firmware? – SpeedyBee
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