Please validate my assumptions:
Originally Posted by jeremey989
You started with a stock Next7HD8G aka NX007HD8G.
You downloaded the modified recovery, stock ROM and root package for the Next7P12-8G.
You attempted to boot the modified recovery for the Next7P12-8G, but it failed to boot to recovery. (it should fail to boot the modified recovery, the modified recovery should not be compatible with a Next7HD8G)
After which, your tablet would not boot normally? It did boot to stock recovery once, but after doing a wipe data / factory reset it won't power on at all?
Have I missed anything? Did you try anything else between those steps? Was there anything else that you tried to flash?