[J_E_F_F]

sorry, my win system does not recognize the card at all, wants to format both partitions. And I don't see those files logging in via winscp

In general built in sdcrad readers don't work well. If you have a USB sdcard reader it will likely work better.

After ssh-ing in you'll find the start.elf file in /flash. By default /flash is mounted read-only, so before copying files you should run:
mount -o remount,rw /flash  

I was using a USB SDcard reader, the same one I used with a linux livecd the previous day to expand the fat partition so I could load debug builds
mounting flash and uploading that way worked well, thanks for that tip.
I, tested #0307 with the start.elf and fixup.dat from 0305 and overclocks enabled, no crashes noticed.
One observation, not sure if it is the overclock or not, but the CPU-Kodi usage is about 35% lower with this configuration than with stock #0307 and no overclocks.