[HELP]Can .boot be changed not using dinit?

I’m testing some buildfiles which is better for my system. When testing different buildfiles, have to use dinit to change .boot file and then copy system files once again. Could I change .boot file just by copying it ? I have tried
#cp -f mynew.ifs /fs/hd1-qnx4/.boot
,but failed with error:resource busy. Any other solution to this question? Thanx a lot in advance!

delete .boot and copy new .boot

From my memory: I don’t think you can use -f option when copying .boot file. Try cp without -f.

Thanks a lot for you two’s helpful tips.