Unhappy [Q] Help - my tablet thinks it's a different model

Flashed a system.flashable while installing a rooted stock rom - my device is an sgp11 / pollux_windy / 16gb wifi model.

I tried to go back to CM because I liked it better, recovery tells me I cant because my device is a pollux. This held true also for omni rom.
I thought, fine I'll install the pollux version.

Recovery told me I cant because my device is a Yuga (which is the phone isnt it?)

How do i get it to think its a real pollux_windy again?! I've flashed several different stock roms, but I cant get back to CM