Failed to install ios.

First, the installation method is incorrect. First of all, because this release is a beta version, you need to download the description file before the update, and you can't install it directly in the system update. 2. Click the link above to download the ios profile, and then enter the installation settings in the profile. Second, the model does not support 1. At present, the supported models are: iPhone 1 1 series, iPhone XS, iPhone XS Max, iPhone XR, iPhone X, iPhone 8, iPhone 8 Plus, iPhone 7, iPhone 7 Plus, iPhone 6s, IPhone 6s Plus, iPhone SE( 1 generation), iphone se (2nd generation), ipod touch (7th generation) iii. abnormal network connection 1. After downloading the description file, the system itself needs to be downloaded online, so if the network connection is abnormal, the installation may fail.