vmlinux15 , vmlinux1, vmlinux10 , vmlinux12, vmlinux3, won't boot here on my a1200

(with good batteries, no sd card, and unplugged of the computer's usb or charger)
Should i do something else before / after flashing this?
btw, i used "bootusb flash 0xa0000 sdhc-qtopia-kernel-to-flash" instead of flashcp, but added the required 0x800 bytes' offset...and if i go back to a backup i made (bootusb read 0xa0000 0x100000 backup) then it reboot fine.
I have the last "test" fw from 06/03...