Smile [Q] I have NVFLASH b'ups- how do I use NVFLASH to recover TF201?

Help please! Noob here.
I installed nvflash for TF201 on JB and generated the files as described here: matthill.eu/android/transformer-prime-tf201-jellybean-nvflash/
I then flashed a custom cmd rom and gapps.
When I tried to restart my TF201 it stuck on pulsing CMD startup. I tried clearing the dalvic/cache and rebooting, still stuck.
How do I use my saved nvflash files to recover? I can both boot into fastboot recovery or adb but don't know how to install a fresh rom zip to my TF201 root to try again. Any help appreciated.