18.06.2 install on brcm63xx

Hello, I have sagem f@st 2704 with BB 14.07 already installed. I downloaded the file:
openwrt-18.06.2-brcm63xx-generic-FAST2704V2-squashfs-cfe.bin
how to install it properly on my device, because the file does not have 'sysupgrade' in its name ?

The Broadcom targets tend to use a single image for both, factory and sysupgrade functionality (the *.bin header is stripped on the fly by sysupgrade, flashing the actual *.trx image).

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