Use third-party iOS repair software. Black screen, stuck on white screen of data, white Apple logo and recovery mode are common indications of upgrade failure and iOS system corruption.

The Dr Fone Toolkit is the perfect iPhone recovery software, it will show you how to recover data after factory reset iPhone, and even recover iPhone data lost after restoring to factory settings.

ReiBoot iOS System Repair is free if you wish to enter/exit recovery mode. However, you must pay to solve iOS system issues, and the pro edition costs $29.95 per month, $35.95 per year, and $59.95 ...

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Tenorshare ReiBoot is an iOS system recovery software tool that can be used to solve a wide variety of common iPhone problems without resorting to iTunes/Finder.