Not on this way. They say now that the whole firmware is locked. We must now wait until a exploit like Meltdown or Spectre is released (those exploits also cause by security issues in the ARM co-CPU.Didn't people also said that on firmware 5.0 as well?
CFW is still possible, but not further then 6.1 So I guess we should wait until the official announcement of Team Execute how they see their product for use. Maybe they will supply their own EMU-NAND backup to load from the SD-card (because that's still possible).