What kind of variant do I have? (D6646)

Recently bought a Z3 and I received today, I come from a Z1 so I know that there are different variations, I was reading how to be root on the Z3 and says that I have to downgrade to 23.0.A.2.93 (for D6603 / D6653) or 23.0.F.1.74 (for D6633) the problem is that my device says it's a D6646 and can't find firmware for this device anywhere including xperifirm, What firmware can I use? I don't want to lose the 32gb and LTE. I attached several screenshots with more complete information

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