fastboot oem unlock

shell> fastboot oem unlock

(bootloader) slot-count: not found
(bootloader) slot-suffixes: not found
(bootloader) slot-suffixes: not found
...
(bootloader) Check 'Allow OEM Unlock' in Developer Options.
FAILED (remote failure)
finished. total time: 0.003s


solution

1. settings >  开发者模式

2. unlock oem

3. restart



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