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Firmware/Flashing
Download iOS Firmware for iPhone, iPad, iPod Touch, Apple Watch and Apple TV.
Identify your device with the 4 digits model number (AXXXX) printed on the back of your device.
DFU mode
https://support.apple.com/en-hk/HT201263
http://osxdaily.com/2010/11/23/how-to-use-ipsw-files/
If you can't update or restore your iPhone, iPad, or iPod touch - Apple Support
http://osxdaily.com/2011/01/08/iphone-recovery-mode/
http://osxdaily.com/2017/01/03/how-dfu-mode-iphone-7/
如果忘記 iPhone、iPad 或 iPod touch 的密碼，或裝置已遭停用 - Apple 支援 shift click on "Restore" to choose IPSW to flash