now we just need someone who knows how is to update the header creation
that area just got updated for what was the "sge" parsers http://lists.infradead.org/pipermail/openwrt-devel/2021-January/033482.html
https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=5ab5bacda280362851830e30d4f9d38b785aac9f
you can edit one your self if you like
add "DIR-2660" text at address 0x40 hex
add "V1.00000" text at address 0x80 hex
add "A1" text at address 0x90 hex
change bytes 0x04 to 0x07 to 00
create crc32 for bytes 0x0 to 0x9F
place result in bytes 0x04 to 0x07
here are the before and after files
before http://luckys.onmypc.net/openwrt/DIR-2660/openwrt-ramips-mt7621-dlink_dir-2660-a1-squashfs-factory.bin
after http://luckys.onmypc.net/openwrt/DIR-2660/openwrtdir-2660-a1-squashfs-factory.bin
I don't know with of these is required but it's what i did for the test file