TWRP (thanks @ValdikSS), encryption disabled, root with latest superSU, framework patched for signatur spoofing & microG.
Core 1 - 3 most offline, only core 0 running and on load core 4 + 5. All cores running only on heavy load. (cpuburn with 20 or more threads)
TWRPalso from ValdikSs, encryption disabled. Root via patching boot.img with Magisk 19.3.