I've discovert my mistakes:
I putted the plugin in sd:/luma/plugin/ and not in /plugins/ one small letter, one big problem.
I renamed ultraSuMoFramework.plg to plugin.plg.
Now everything is working.
PS. I've tried the new BootNTRSelector 2.11 on LUMA 9.0 too, and the ultraSuMoFramework.plg dosen't load on ver. 3.6, but does on ver. 3.3, but it did run on 3.6 with BootNTR 3.2 on LUMA 8.1.1. Is that an issue from the plugin site or the BootNTRSelector?
you need to replace the boot.firm with the original to use ntr cfw again