__TOP__ Download Developer Mode

However, if you're writing software with Visual Studio on a computer for the first time, you will need to enable Developer Mode on both the development PC and on any devices you'll use to test your code. Opening a UWP project when Developer Mode isn't enabled will either open the For developers settings page, or cause the following dialog to appear in Visual Studio:

Developer Mode replaces the Windows 8.1 requirements for a developer license. In addition to sideloading, the Developer Mode setting enables debugging and additional deployment options. This includes starting an SSH service to allow deployment to this device. In order to stop this service, you need to disable Developer Mode.

Download Developer Mode

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Production Chrome OS devices that are shipped from the factory are locked down and will not let you make changes to the software. This page describes how to enable developer mode and get root access to your system.

Background: iPhone 14, iOS 16.1.2 did not show the Developer Mode under Privacy and Security. Some of the contributors said that you had to connect the iPhone to Xcode. Tried that and still no Developer Mode. A contributor said, "Your might have to connect, disconnect, and reconnect for the developer mode to show on the iPhone". For me this was the case and it worked. My configuration is Xcode 14.2 running on MacOS Ventura 13.2.

All I had to do was plug in my iPhone 13 (This works with all Apple iPhones) into my MacBook Air (which Works with all MacBooks and iMacs), then open Xcode, and create a new project. Then on my iPhone, I opened settings, went to privacy and security, then scrolled down. Above the "Lockdown" button was developer mode. Then click it, enable it, then do the following prompts.

Try this: unplug your cable, unlock your iphone, plug your cable again, you will see the option. The iphone will restart and when it turns on, a popup asking if you want to activate developer mode will show, accept and done.

In iOS 16 (iPhone 14) your "Developer Mode" toggle button can really be hard to get to show up on your phone. Like many above have answered, it's supposed to show up under Settings-> Privacy & Security-> (scroll to bottom, almost the last entry) but doesn't bc Apple really doesn't seem to care about making basic stuff easy for developers, so try this:

Connect your iPhone to your Mac via a chord.If you get a prompt to allow device, allow it.Open XCode.Click on the Product menu.Select destination.Click on your device name (it might already show a checkmark-- this is completely non-intuitive bc Apple is horrible)Follow any promptsNow when you go back you can see the developer mode and toggle it on.

Apple in iOS 16 decided to make it super-duper difficult to enable Developer Mode, which is supposed to show up on the iPhone under Settings->Privacy & Security. No reason why this is the case, other than Apple can be pretty dim when it comes to trusting human beings. What they COULD do is just use FingerID or FaceID to match developers to their Connect accounts, and make it really simple to toggle the button, INSTEAD OF HIDING IT WHICH IS TOTALLY INSANE ON APPLE'S PART!

Apple truly has issues when it comes to making life easy on its NEW YOUNG BUDDING developers, this much is certain. Maybe they like to keep it that way, to pad the salary levels at the top? (like Fraternity hazing)

These two requirements are somewhat at odds. Locking down a device to protectusers makes it less useful for developers. Openings for developers to runmodified software easily can also be exploited by attackers.

Note that this document is specifically about the developer mode in GoogleChrome OS devices, not about other Chromium OS-based devices. It's focused ondevelopers who want to install a different operating system on a device thatinitially shipped with Google Chrome OS.

The custom software installed is unlikely to be intentionally malicious. Theprimary risk is that developer images may not autoupdate, so the software on thedevice will not be patched to close vulnerabilities. This risk has manifestedrecently in smartphones with user-modified ('jailbroken') operating systems.

The developer has access to developer tools, the target device, and anydocumentation which came with the device. They are experienced enough to use ascrewdriver to open a panel, but most will not be willing to use a solderingiron to modify the device or void their warranty.

The developer expects similar performance while using their own OS as they havewhile using Google Chrome OS. That is, boot time and the boot process should notbe significantly impaired from a normal device.

The developer should be able to go back easily to running Google Chrome OS, atwhich point they should have access to automatic updates. This case also coversresponsible developers who buy or borrow a device, try it out with their own OS,then run recovery mode to restore the device before returning it.

This is much the same as the developer use case. The difference is that the userdid not build the install. This is probably more common than developer installs,particularly for use cases such as media servers or set-top boxes.

A vendor involved in manufacturing a device (OEM, ODM, BIOS vendor, componentvendor) must be able to develop and debug firmware, including thenormally-read-only parts. For example, the vendor must be able to fix bugs inrecovery mode.

On the transition between dev and normal modes, there will be a 5 minute delayduring which the OS will wipe the stateful partition of the device. The delayand wipe occur on the first boot after the dev switch is enabled.

Note that the delay protects both normal users and developers; an attackertrying to change the image on a developer's machine (for example, at a Linuxconference, where Chromium OS machines are likely to be common) will still incurthe delay.

The device will have a mechanism through which it always boots in recoverymode,regardless of the position of the developer mode switch. This provides a pathfor users and developers to get back to Google Chrome OS, with all its safetyand autoupdates.

The recovery boot image is Google-signed software on a removable drive. Therecovery boot image is what copies new firmware and software from the removabledrive to the fixed drive when booted in recoverymode.Recovery mode firmware will load only Google-signed software from the removabledrive. Those kernels contain their own initramfs, which copies the recoveryimage onto the fixed drive.

If the developer switch is off, the recovery boot image will refuse to copyanything but Google-signed software to the device. This protects againstdrive-by attacks; the attacker must have time to get to the developer switch.This also protects normal users from a remote attacker who stores a maliciouspayload on the user's SD card and then attempts to reboot into recovery mode toinstall that payload.

At boot time, if the developer switch is on and the kernel is signed, but not byGoogle, then a warning screen will be displayed by the firmware. The UI variesslightly with the device, but may show a message something like this:

If the user follows the on-screen instructions, the device will either revert tonormal mode or reboot into recovery mode. The on-screen instructions typicallyinvolve pressing SPACE or RETURN, since these are the most common keys userspress when trying to get past a screen without reading it.

If the user presses Control+D, the device will bypass the warning screen waitingperiod and continue booting the developer-signed code. Note that there is noindication on the warning screen that Control+D is a valid option, so naiveusers won't be tempted to press it. The Control+D sequence will be documented onthe Chromium OS developer website (you're reading it now), where it is easy fordevelopers to discover. We use the Control modifier so that accidentally bumpingthe keyboard will not trigger it. For interactive developers, this reduces thepain threshold of the warning screen to a single keypress.

If the user presses a key other than Control+D, space bar, Enter, or Esc, noaction is taken. This reduces the annoyance level for developers; accidentallypressing D+Control or Control+S does not reboot into recovery mode.

After 20 seconds of displaying the warning screen, the device should beep. Thiswill alert a nearby user to look at the screen and see the warning. Interactivedevelopers are likely to press Control+D before this time, so will not be forcedto endure the beep.

If the user waits 30 seconds, the device will continue booting thedeveloper-signed code. This is necessary to support the remote developer subcaseabove. It does mean that a nave user could keep ignoring this screen. This is areasonable tradeoff, given that requiring a keypress invites developers to hackverified boot.

Note that a sufficiently advanced developer willing to void the warranty ontheir device may be able to make the hardware modifications to disable writeprotection and replace the normal Google Chrome OS firmware with their ownfirmware. Such a developer would also be able to desolder, remove, and rewritethe EEPROM chip with their own firmware, so including manufacturer support doesnot represent a significant reduction in security.

The attacker will not be able to maintain long-term persistent control over thedevice. When the device next reboots, the verified boot process will detect themodified software and trigger recovery mode (if the developer mode switch isoff) or a warning screen (if the dev mode switch is on).

Stores should be advised to boot returned Google Chrome OS machines. If they do,they'll notice the warning screen and can refuse the return (at which point thedeveloper will turn off the developer switch and run recovery mode and thensuccessfully return the device). e24fc04721