[Q] multirom or boot manager pro on HTC one sprint topic

I'm trying to find out how I can get a multiboot of Roms on the sprint HTC one , I have seen it has been ported to the Verizon variant how can I get this on the m7spr . I have tried boot manager pro which is not supported either but allows you to choose which blk partition to set it up in plz I have been trying to get this to work I have tried compiling and porting multiboot but only know so much so didn't make to the end , I have used the m7 kernel recovery and multirom.zip all can be flashed to m7spr except mutirom.zip kernel and recovery work , I see it needs a kexec-hardboot patch, a custom recovery and the multiboot.