Update: new driver allows it to start in 4k mode but still CtD at unlimited. Error log:
Faulting application name: KSA.exe, version: 2025.11.4.2791, time stamp: 0x67200000
Faulting module name: KERNELBASE.dll, version: 10.0.26100.7171, time stamp: 0xb1a43a46
Exception code: 0xe0434352
Fault...