How To Force Restart iPad

- I try to jailbreak an iPad, but I got an error "could not connect to lockdown". So I went on using Uncle Google and found this info related to it.

- So I try to Reset All Content and Settings but unsuccessful (loading symbol too long). 

- So I use Uncle Google again to find for solution and found this info.

- So I press Home+Lock (Power button?) for seconds then iPad restart.

- But the reset is not successful.