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A customer brought in an ipad air, they said the device asked to update to ios 10. So they plugged the ipad in and let it update. And they came back and now the device will not power on . Itunes wont recognize the device and neither with u3tools. Any advice? Hard reset, soft reset nothing works. Charged it over night too, also DFu mode does not get the device recognized

Seems like something went wrong during the update that caused it to brick the device. Reach out to Apple for support or replacement if under warranty. Best of luck to you.

I find it very strange that an update would brick an iPad like this. Have you tried another computer? If not, try bringing the iPad into an Apple Store’s genius bar. They can try DFU another computer and perform better diagnostics on the iPad.