Fastboot: Unknown error: downloading 'boot.img'...OKAY [ 0.555s]booting... FAILED (remote: unknown command)finished. total time: 0.569s · Issue #254 · ubports/ubports-installer · GitHub
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twrp - Lg Aristo 2 Fastboot flash recovery - FAILED (remote: 'unknown command') - Android Enthusiasts Stack Exchange
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