Thanks, Gustavo
Found the tool, followed instructions, downloaded blhost and put it like this here:
blhost unzipped
However, the elftosb tool is not included in the middleware, so I copied it from flashloader RT1064, and use following command to make .ivt_flashloader.bin :
> elftosb.exe -f imx -V -c imx-dtcm-unsigned.bd -o flashloader.bin evkmimxrt1024_flashloader.srec
it ends up two .bins and I renamed first one as ivt_flashloader.bin and put it under \Profiles\MXRT102X\OS Firmware\
Also renamed iLed_Blink.bin as boot_image.bin and put it same folder as above - it is compiled with XIP header. Now I got following error message when I try MfgTool2.exe :

"Boot" body="BootStrap" error, file="D:\WORK\NXP1024Projects\RT1024EVK_mcu-boot\bin\Tools\mfgtools-rel\Profiles\MXRT102X\OS Firmware\ivt_flashloader.bin"
looks like something wrong with the ivt_flashloader.bin?
Could help please?
Regards! sorry so many details to read.
Ping