For being able to flash your firmwares on these drives, Binflash has been updated to support all these drives. This support is still untested however.
Released 1.Z1 modified firmware for the ND-4570A drive.
Released 1-Z1 modified firmware for the ND-4571A drive.
Released MD 1.F0 firmware with name string changed to NEC ND-4570A
Supports full bitsetting.