same for me
as a long-time lib user (we have inhouse-framework based on the lib), I tried all the tricks those worked before, like this: libimobiledevice/ideviceinstaller#48 (comment)
now these tricks do not work for me anymore

chronicles:
we got new XS Max
faced UDID issue: #706
uninstalled/reinstalled ^HEAD of libimobiledevice and ideviceinstaller
faced "ERROR: Could not connect to lockdownd, error code -3/-5/-19/-21"
tried all existing tricks with /var/db/lockdown, they didn't help

Also have faced with "ERROR: Could not connect to lockdownd, error code -3" and "-21" after reinstall libimobiledevice

@aeschenko, @schichagov Hi sir,

i tried everything (chmod lockdown.c, reinstall all, update raspbian, try older release, delete files from urs/local/lib). Today i tried change iphone. Last days i used an iphone 6 with ios12, today i try with iphone 4 with ios 7 and iphone5 with ios 10.
These work finally, so this problem has create from ios 12.

To resolve this problem, we have to wait an update from libimobile or use a device with ios 11 or lower.

Greetings

(sorry for my bad english)

@MastroGeppetto14 Are you facing this issue on macOS Mojave or macOS High Sierra? For me, it was working fine on macOS High Sierra. I am facing this issue ever since I upgraded to macOS Mojave.

@MastroGeppetto14 Are you facing this issue on macOS Mojave or macOS High Sierra? For me, it was working fine on macOS High Sierra. I am facing this issue ever since I upgraded to macOS Mojave.

Nope i'm using Ubuntu (16) / Raspbian stretch
both give me problems

i solved the problems about ubuntu 16 (i installed ubuntu mate 16 on raspberry)
Using this guide:
https://gist.github.com/samrocketman/70dff6ebb18004fc37dc5e33c259a0fc

Ios 12 works fine even with patches 12.0.1/2/3

finally works after

brew uninstall --ignore-dependencies libimobiledevice
brew uninstall --ignore-dependencies ideviceinstaller
brew uninstall --ignore-dependencies usbmuxd
sudo rm /var/db/lockdown/*
brew install --HEAD usbmuxd
brew unlink usbmuxd
brew link usbmuxd
brew install --HEAD libimobiledevice
brew install --HEAD ideviceinstaller

@aeschenko Thanks. It also works for macOS Mojave.

finally works after

brew uninstall --ignore-dependencies libimobiledevice
brew uninstall --ignore-dependencies ideviceinstaller
brew uninstall --ignore-dependencies usbmuxd
sudo rm /var/db/lockdown/*
brew install --HEAD usbmuxd
brew unlink usbmuxd
brew link usbmuxd
brew install --HEAD libimobiledevice
brew install --HEAD ideviceinstaller

thanks a lot

I also had to unplug my iPhone before running the commands listed by @aeschenko. Thanks! I spent waaaaay too much time on this.

This did not work for me. I get a few errors, some like No such keg: /usr/local/Cellar/libusbmuxd when trying to (un)link usbmuxd

brew install --HEAD usbmuxd
Running brew update --preinstall...
Warning: Use libusbmuxd instead of deprecated usbmuxd
Warning: Use libusbmuxd instead of deprecated usbmuxd
Warning: Use libusbmuxd instead of deprecated usbmuxd
==> Downloading https://mirrors.ustc.edu.cn/homebrew-bottles/libplist-2.2.0.montere
######################################################################## 100.0%
==> Cloning https://github.com/libimobiledevice/libusbmuxd.git
Updating /Users/jiangpeng/Library/Caches/Homebrew/libusbmuxd--git
==> Checking out branch master
Already on 'master'
Your branch is up to date with 'origin/master'.
HEAD is now at 2ec5354 [github-actions] macOS: build for arm64 too
==> Installing dependencies for libusbmuxd: libplist
==> Installing libusbmuxd dependency: libplist
==> Pouring libplist-2.2.0.monterey.bottle.tar.gz
🍺 /usr/local/Cellar/libplist/2.2.0: 31 files, 492.2KB
==> Installing libusbmuxd --HEAD
==> ./autogen.sh
Last 15 lines from /Users/jiangpeng/Library/Logs/Homebrew/libusbmuxd/01.autogen.sh:
checking whether to build static libraries... yes
checking for pkg-config... /usr/local/Homebrew/Library/Homebrew/shims/mac/super/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for libplist-2.0 >= 2.2.0... yes
checking for libimobiledevice-glue-1.0 >= 1.0.0... no
configure: error: Package requirements (libimobiledevice-glue-1.0 >= 1.0.0) were not met:

No package 'libimobiledevice-glue-1.0' found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables limd_glue_CFLAGS
and limd_glue_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.

READ THIS: https://docs.brew.sh/Troubleshooting

Please create pull requests instead of asking for help on Homebrew's GitHub,
Twitter or any other official channels