I checked a exe file with fi. It reported the exe file was packed by upx1.21,when I used "upx -d " decompressed the file,upx gave a error " CantUnpackException: header checksum error"?
why?Please help me!

Unpack it manually

but I am a newer. I haven't ability to unpack it manuall.Is there any tools?

Hi Powerful:

Somewhere I've read: "Whenever somebody asks you whether you can do something, say you will try ... and then give it your BEST shot". If you live by this philosophy, then you'll succeed. Everybody here once were (are still here ) newbz.... Search the forum, search the the web for some good UPX tutorials and I assure you, you'll not remain newbz any longer!!!

Signed,
-- FoxThree

How great you are!I will do that. Try to do something.I believe I will succeed.Thanks.

Hello powerful !

The smiley you've choosen to reply to foxthree's post says it all. ( - embarrasment )

You should follow his advice. If you know an automatic unpacker you will be happy and unpack the program. When you find the next version of UPX you'll come again and ask again for an unpacker. But if you know how to unpack manually, you will never need help of other people again.

In otherwords - give a man a fish you feed him for a day teach a man to fish you feed him for a lifetime. Or so the old proverb goes .

Snatch

Hello Snatch !

The RCE translation is the following:
But it's not too good to be put on the main page, else many people will say "I'm here, I don't know anything, I won't read any tutorial, I want you to teach me how to crack xyz".