Welcome to the forum. Why do you want to put your phone in DFU mode?
...because of, so I can check iphone's data with Tiny Umbrella.
...may be my attemtion to jailbreak the iphone will be unsuccessful.
Thanks.
Are u able to access the phone now? If yes go to settings> general> about/ there you have all the info you need about the phone.
If you are not able to access the phone, i don't think that tinyUmbrella can read anything on the device while it will be in DFU mode. But you can try it to figure it out, that process of putting the phone into DFU mode and have it check by tinyUmbrella will not earase any information from the phone anyway.
If tinyUmbrella can't read out the information about the phone, And you are not able to access the phone at the moment, then you will have to connect it to itunes and let itunes upgrade or restore the latest iOS into the phone.