I`m now on stock 5.0.2 using the v12 advanced Kernel and 3.0.2 Recovery.
I found a new version of Multirom --> v33 --> https://androidfilehost.com/?fid=385035244224393829
I'm able to boot a 6.0 Marschmallow CM Rom (RR works and th...
you can download the source from:
https://github.com/XperiaSTE/android_kernel_sony_u8500 (choose cm 12.1 brunch).
Then change the two files manually in the sourcecode, which you need for the cdmode.
Next read out the kernel config wi...