If the phone is not in a operable state then no i don't know of any way to check. As long as your battery was mostly charged you can try something if you like. Try SBFing with the .605 file, when thats complete, wipe data and try to reboot. If it works, great. If you see the bootloader screen and it says Mem_Pack Blank then you were on .621 and need to use the 2nd link I gave you.
Maybe i read that wrong, you already SBF'd with .621 and the phone is on now?
Maybe i read that wrong, you already SBF'd with .621 and the phone is on now?