I cannot find any references to m44g. If it is an m33g, it should work with the OpenWrt images as long as the bootloader is below version 7 (you can build a custom image that works with v7 boot with a patch). You may need to use an older image to netboot (https://github.com/openwrt/openwrt/issues/13255#issuecomment-1675384899).
RouterOS will not let you downgrade past the factory bootloader version. As to the wiki page, I posted some details on another topic: