The installation of e-2.6.3-t-20241230-UNOFFICIAL-gta2xllte.zip per ‘Install’ via TWRP_3.7.0_12 runs without errors. After the first start, the Samsung logo is displayed with two messages at the top left:
KERNEL IS NOT SEANDROID ENFORCING (red font)
Set Warranty Bit : kernel (yellow font)
The system remains motionless in this state, i.e. no automatic reboot, no bootloop.