Fastboot error attempting to unlock bootloader on Sony Xperia 10 V

General
1

I receive the following error when attempting to unlock the bootloader on Sony Xperia 10 V model XQ-DC54; a new factory unlocked phone updated to the latest Android 13.

Error:

‘fastboot’ is not recognised as an internal or external command,
operable program or batch file.

The driver for Sony Xperia X is correctly installed. Device manager shows Sony sa0114 and Sony sa0114 ADB Interface. The blue led does appear on the top left of the screen when connected to the USB port. The bootloader is confirmed to be unlockable in Service info > Configuration > Rooting Status.
I obtained the unlock code from Sony using IMEI 1. The purchased Sailfish_OS-Jolla-5.0.0.68-xqdc54-1.0.0.44 was unzipped to a folder and the SW_binaries_for_Xperia_Android_14_5.4_v3a_zambezi image was added to the Sailfish folder. The mentioned fastboot error occurs when running the command “fastboot oem unlock fastboot oem unlock 0x058C…” without the quotation marks. The phone has the necessary developer options activated; unlock OEM, USB Debugging, Automatic system updates.
I’m using windows 10 Pro 22H2.

Have I missed anything? How can I unlock the bootloader?

2

Use the command in same directory as the fastboot.exe resides in.

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2025-07-26_184149
2025-07-26_1841491102×563 151 KB

The fastboot application is already in the Sailfish folder on which I executed the fastfoot command mentioned earlier

4

The problem was that there was a folder within a folder and I had applied the command to the outer folder that does not contain the fastboot application. Thank you for your support.