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VIVO devices (especially those running Funtouch OS) often have a locked Fastboot mode for security reasons. Unlike stock Android devices, you may not be able to use Fastboot commands on a standard VIVO Y21t unless the bootloader is unlocked.
You can open the menu , but on a standard VIVO Y21t, you likely cannot use Fastboot for flashing. For system repairs, use Recovery Mode or EDL mode (requires authorized VIVO tools). How to Open Fastboot Mode on VIVO Y21t
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