Error code 56 maybe NFC circuit or the Rear camera circuit issue. Please try the following ways.
1. Check the condition of rear camera, the malfunction of rear camera and related circuit could cause error code 56.
2. Check if the NFC IC is pseudo soldered or damaged.
More about the error code repair, please check https://blog.rewa.tech/detail/tips-for-troubleshooting-all-the-itunes-error-codes-of-iphone6-6plus
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