执行flutter run命令报错：:ERROR: Could not connect to lockdownd, error code -17

报错信息:

ERROR: Could not connect to lockdownd, error code -17

找不到模拟器或者真机设备。这个问题应该是flutter SDK更新后引起的。

解决办法：修改lockdown文件夹的读写权限

修改文件夹权限

1. 点击屏幕空白位置或者finder(访达) > 前往 > 前往文件夹 > 输入/var/db/找到lockdown文件 > 右键显示简介 > 点击底部共享与权限 > 点击右下角的锁输入密码解锁 > 点击共享与权限下面的加号，将自己账号添加到权限列表中，修改为读与写 > 最后锁定权限即可。

2. 接下来依次在终端执行下方命令

brew update
brew uninstall --ignore-dependencies libimobiledevice
brew uninstall --ignore-dependencies usbmuxd
brew install --HEAD usbmuxd
brew unlink usbmuxd
brew link usbmuxd
brew install --HEAD libimobiledevice
brew install ideviceinstaller

执行brew install --HEAD libimobiledevice命令报错:

Error: An exception occurred within a child process:
  DownloadError: Failed to download resource "libimobiledevice"
Failure while executing; `git clone --branch master https://git.libimobiledevice.org/libimobiledevice.git /Users/huanghaipo/Library/Caches/Homebrew/libimobiledevice--git` exited with 128. Here's the output:
Cloning into '/Users/huanghaipo/Library/Caches/Homebrew/libimobiledevice--git'...
fatal: unable to access 'https://git.libimobiledevice.org/libimobiledevice.git/': Failed to connect to git.libimobiledevice.org port 443: Operation timed out

解决办法：

打开科学上网软件，但是还是报错。但是第三次去执行brew install --HEAD libimobiledevice命令成功了。当时科学上网软件在打开着，很有可能是网速的问题。或者说多执行几次这个命令

Error: An exception occurred within a child process:
  DownloadError: Failed to download resource "libimobiledevice"
Failure while executing; `git clone --branch master https://git.libimobiledevice.org/libimobiledevice.git /Users/huanghaipo/Library/Caches/Homebrew/libimobiledevice--git` exited with 128. Here's the output:
Cloning into '/Users/huanghaipo/Library/Caches/Homebrew/libimobiledevice--git'...
error: RPC failed; curl 18 transfer closed with outstanding read data remaining
fatal: the remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed

最后执行flutter doctor命令检测，成功找到设备。