My treo is dead after custom rom install.

I can load the bootloader screen and TeraTerm can communicate with it successfully. But how i could update the ROM? Can I copy ROM image to SD and type 'sd2r' in TeraTerm?

However, which files I need to copy to the SD in this case? Or I need to do it another way round?

I've tried putting the folder "PALM/", "DeviceCustomizer/" or "treo650.ROW/" into to the root of SD and use 'sd2r' command but all don't work indeed.
Should i need to convert into a binary format or find an image ROM before copying to the SD?

Seems i just need one more step to make it all work..
I'd be so much appreciated if someone here could help me..
Thank you so much