Either simply open the "Test" menu in NTM and it'll show (make sure you're in SysNAND mode or it'll show for your SDNAND) or get the
latest commit build and run the Data Management enabler if you want real data management.
Also, can you give any more details on what exactly happened? Like, on the bricked console, does holding A + B while booting still let you go to the Unlaunch menu? Or what error did you get? That's really concerning if NTM actually bricked a console, especially if it wasn't just random NAND failure.