system-image format on ubports.com
I noticed that there are system images available for the devices that are supported by ubports
Re: Hammerhead on system-image.ubports.com
..but is there some way to make those tar.xz files to .img files that could be used with twrp or multirom ?
I remotely remember that there was a patch somewhere to make multirom use the ubports servers. MR itself has support for the format. Maybe you can dig that up.