My screen is broken, but I can force DFU, which I did.
In iTunes, I get "Cannot update software."
The to restore I Download 10.3.3 firmware, error 14 cannot update.
Any workaround that you can think of for erasing the data on this device?
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No easy workarounds if iTunes won't restore / erase an iPhone in normal mode, let alone when you have it in DFU mode. Apple Configurator might be worth a try, but it uses the same library / underlying erase code the last time I checked. Same with Xcode.
I suppose the only workaround is to disassemble it and destroy / sanitize the data by jumping some of the pins to take control of the storage. The getting it open might be easy for most skilled people - the jumping the pins would need specific technical tools and training as would getting a controller to erase systematically the data.