Apple has officially released iOS 14 Beta version to users to experience new features more attractive. However, it is only Beta, so iOS 14 still has many bugs. So, if you want to downgrade iOS 14 to iOS 13.5.1 for more stable use then follow the instructions below.

Apple released iOS 14 Beta
At WWDC 2020 held on June 22, Apple has officially introduced iOS 14 and iPadOS 14 for iPhone, iPad and iPod Touch devices. As a new operating system version integrating many attractive features, iOS 14 Beta has quickly attracted a large number of users to download and experience.

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Apple introduced iOS 14 at WWDC 2020 event held on 22/6 last
However, the test version is usually only for developers and programmers, so iOS 14 Public Beta 1 cannot avoid errors that arise, affect and interrupt the usage process such as: battery drain, main screen error, camera inactive, inaccessible to many apps, …
For users, even a slight error will cause discomfort when using the smartphone. So, if you have experienced enough iOS 14 Beta then consider downgrading from iOS 14 to iOS 13.5.1 to return to the old version more stable and smoother.
How to downgrade from iOS 14 to iOS 13.5.1
Step 1 : Turn off Find My iPhone by: Settings> Apple ID> Find> Off
At this step, Apple ID and password are required to disable Find My iPhone.

To restore iOS 13, turn off Find My iPhone
Step 2 : On your PC / laptop, download and pre-install iTunes.
Download to computer iOS 13.5.1 version suitable for iPhone devices
Download iOS 13 https://ipsw.me/.

Select the Apple device that will install the upcoming version of iOS 13

Select an available iOS ROM with a green area and download it to your computer
Note: Make sure you download the most suitable iOS version for the iPhone / iPad you are using.
Step 3 : Connect your iPhone to your computer via iTunes.
At the main iTunes interface: select the phone icon> press Shift + left mouse key> Update or Restore iPhone> select the downloaded iOS ROM and install it.

Downgrading iOS 14 to iOS version 13.5.1 quickly and simply
Note: During the installation process, users should not use or disconnect the iPhone from the computer to avoid interruptions and unfortunate problems.
The process of downgrading from iOS 14 to iOS 13.5.1 will take about 20-30 minutes, depending on the network speed and processing speed of your iPhone / iPAd. Therefore, make sure your Apple device has enough battery to go through this process in the smoothest way. I wish you success!