手機 - Astro Slide 5G - Unlock Bootloader

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參考資訊：
https://github.com/planet-community-org/planet-devices/wiki/Astro-rooting
https://www.ifixit.com/Guide/How+to+unlock+the+bootloader+of+an+Android+Phone/152629

步驟如下：
1. 進入fatsboot
2. 執行如下命令

$ fastboot flashing unlock
    (bootloader) Start unlock flow

    OKAY [ 25.442s]
    Finished. Total time: 25.442s