Where can I find a packer for Acorp LAN410v2?

Question

linux

I managed to find out the approximate structure of the firmware file for the same routers, the current is V1 (yes, I know that there is a different percentage, but the toolchain will come up like this, and the firmware structure is the same for them - this is proved by the fact that you can pour the firmware from v2 into v1, although you can get while the corpse is restored only by the console).
Namely: 64 bytes is an unknown garbage that contains some kind of CRC or something like that. Next, N bytes of the squashfs file system, until a combination of a large number of zeros is encountered, and then the packed kernel image seems to be. It turned out to unpack the file system, but when packing, a discrepancy appears somewhere around 640 bytes (I think this is due to a different version of mksquashfs). But if you embed this shortened FS image and try to flash the router, nothing comes out, which is quite predictable.
Specifically, the packer file is most likely called "splitinone.pl", but it was not possible to find it for the required version of hardware. Please help here.