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C:\Users\chen4\Downloads\platform-tools_r31.0.2-windows\platform-tools>fastboot devices
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C:\Users\chen4\Downloads\platform-tools_r31.0.2-windows\platform-tools>fastboot getvar current-slot
current-slot: b
Finished. Total time: 0.016s
C:\Users\chen4\Downloads\platform-tools_r31.0.2-windows\platform-tools>fastboot –set-active=a
Setting current slot to ‘a’Â Â Â Â Â Â Â Â Â Â Â Â OKAY [Â 0.016s]
Finished. Total time: 0.016s
C:\Users\chen4\Downloads\platform-tools_r31.0.2-windows\platform-tools>fastboot reboot
Rebooting                     OKAY [ 0.000s]
Finished. Total time: 0.000s
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