Hacking How updated can a 360 be?

[Myth]

I have a Xbox 360 red Res 5 version, Jasper. It's was last online in the middle of 2015.

Are there any hacks, that support a dashboard from mid 2015, I know the original RGH/JTAG will not work, but I recently heard about RHG 1.2 etc?

Thanks, Myth.

 

[DinohScene]

Coolrunner 4 XL + JRprogrammer/NAND-X is all you need.
Dashboard doesn't matter anymore.