Softload in !Boot with Iyonix

Have been running Softload RO 5.21 from ‘Run’ on my RO4.02 SA RPC
Loads RO5 unless – key ‘n’ is pressed.
Trimed wait time too – to half.

It seems to work well – lot quicker bootup times.

Have tried the same on my Iyonix with RO 5.16 – with RO 5.21.
But the Softload program says there is ‘not enough memory’ ie no free memory.

Have tried -m 12M but no difference.
(works from PreDesk)

Is this what I am trying possible?
Thanks