So I tried this:
root@kali:~/Desktop/fmk# binwalk upgrade-2.4.0.bin
DECIMAL HEXADECIMAL DESCRIPTION
--------------------------------------------------------------------------------
512 0x200 LZMA compressed data, properties: 0x6D, dictionary size: 8388608 bytes, uncompressed size: 2805816 bytes
927576 0xE2758 Squashfs filesystem, little endian, version 4.0, compression:xz, size: 12316692 bytes, 2963 inodes, blocksize: 262144 bytes, created: 2015-08-04 02:40:49
And then I used the following dd:
sudo dd if=upgrade-2.4.0.bin of=pineapple.squashfs bs=1 count=12316692
And I can't unsquashfs pineapple.squashfs. Can't find a SQUASHFS superblock on pineapple.squashfs
I did it with:
binwalk -Me upgrade-2.4.0.bin