You cannot perform live migrations between an UltraSPARC T2, UltraSPARC T2 Plus, or SPARC T3 system and a SPARC T5, SPARC M5, or SPARC M6 system.
The SPARC T4 system must run system firmware version 8.7
The SPARC T5, SPARC M5, or SPARC M6 system must run system firmware version 9.4
Both the source and target machines must run the Oracle VM Server for SPARC 3.2 software