Official Samsung firmware can be flashed with a locked bootloader, with limits

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A locked bootloader does not prevent flashing official Samsung firmware, since the bootloader accepts any software carrying Samsung's signature. Odin can load stock AP, BL, CP, and CSC files in download mode as long as they are genuine and match the phone model. Two conditions apply: the firmware must be unmodified and signed by Samsung, and its bootloader version cannot be older than the one already installed due to rollback protection. Custom recoveries, custom ROMs, and root methods break the signature check, so they still require unlocking the bootloader. Flashing stock firmware does not change the lock state or trip Knox, leaving the phone's lock status and warranty status unchanged.

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