Flycast iOS: How to fix Flycast keep crashing error | Flycast – DreamCast Emulator for iPhone & iPad

Managed to install Flycast iOS on your iPhone, iPad or iPod Touch but get disappointed because despite whichever games you have tried running, the Flycast emulator always ended up crashing? Well, that’s not the Dreamcast games issue nor Flycast issue, but rather latest Apple iOS and iPadOS issue. But don’t worry, that’s the reason I’m writing this (quite) long detailed guide, so that you can get rid of the crashing issue and end up able to boot Flycast to run DreamCast games on your iPhone, iPad or iPod Touch.

  • This tutorial detailed the steps to fix Flycast crashing error, so that you can play DreamCast games on your iPhone running on latest iOS.
  • No jailbreak nor any forms of subscriptions is required.
  • This tutorial though intended for iPhone, but all the steps provided here works and applicable for iPad as well as iPod Touch.
  • For other interesting articles related to gaming, check it out here Flycast, DreamCastXboxPS5Nintendo Switchother gamingiOSTech or more at JILAXZONE.
  • If you find this article / content inside is already obsolete, do let me know by commenting on the comment section below so that I can update the article to reflect the latest process/news. Thanks.

For other Flycast iOS related articles, do check here: Flycast iOS at JILAXZONE.

This is the reason why Flycast iOS keeps crashing

Like other modern emulator, Flycast requires JIT to run. JIT is short for Just-In-Time compiler. It’s a method, like its name implies, to compile codes during execution, so the codes will then translated into device native code which resulted in faster performance. Apple quietly introduced this feature back in iOS 14.2. Many emulator starts making use of this feature because with JIT enabled, it greatly improves the emulator performance running on Apple devices. However knowing that people used the JIT feature outside what Apple initially intended (people are using it mainly for running emulators and VMs), Apple quickly pulled JIT out on iOS 14.4. That’s the reason, if you are on iOS 14.4 or above, you can’t get Flycast running out of the box.

This article will guide you on how to enable back the JIT feature on latest iOS so that you can run Flycast and play DreamCast games on your Apple devices.


These are the things you need to prepare to before being able to run Flycast iOS. If there are certain things you don’t have / don’t know yet, don’t worry, as part of the installation and configuration steps, all the download links and how to create / configured them are shared in details.

#Item requiredDescription
aiPhone or iPad or iPod TouchThe main show.
bComputer (either a Mac or PC)Required to push JIT package from your Computer to run Flycast on your iPhone.
ciTunesRequired to be installed on your Computer to install Flycast to your iPhone and to transfer games to Flycast.
dAltServer & AltStoreRequired to be installed on your iPhone to get Flycast Package ID. If you don’t have AltStore yet on your iPhone, check this out: Here’s how to install AltStore: iPhone alternative App Store at JILAXZONE.
eLightning cableRequired to push JIT package from your Computer to run Flycast on your iPhone.

Here’s how to fix Flycast keep crashing error on latest iOS

The following steps are to be done if your Flycast iOS keep crashing despite numerous times you had it opened. The method I’m sharing you here is called “wired tether method”.

The steps written here are tested on:

a) Latest iOS – at the time this article is written is iOS 15 Public Beta 5 and using the iPhone that I currently have – iPhone XR. In case you are not on iOS 15 or iPadOS 15 yet, check the link here to get iOS 15 & iPadOS 15: Here’s how to update iPhone to iOS 15 today (iPad and iPod Touch included!) at JILAXZONE.

b) Latest Windows – at the time this article is written is Windows 11 Pro Preview Build 22000.100 co_release. In you are also using Windows and would like to install Windows 11, check the link here to get them installed: Getting Windows 11 and installing on your Computer at JILAXZONE.

Should you are using different version of iOS or iPadOS and / or different computer OS (such as Linux / Mac), the steps may be slightly different but should not deviate too much. Anyway, in case you have questions / issues, feel free to put them down on the comment section down below, I’ll be more than happy to help you.

Step 1) Connect your iPhone and ensure iTunes recognize it

Plug in your iPhone to your Computer. Open iTunes if it’s not automatically opened. Ensure your iPhone is recognized by iTunes and shown up on iTunes.

Do NOT unplug your iPhone until the rest of the steps here.

Step 2) Download libimobiledevice

libimobiledevice is set of libraries to communicate with services on iOS devices using native protocols. You can get libimobiledevice from the following link.

Download libimobiledevice

Choose zip file according to your Computer OS. Since I’m using Windows, so I downloaded the Windows version.

For easier references throughout the article:

1) Regardless of the Computer version (whether Windows, Mac, or Linux), let’s just call the zip file downloaded from the link as “”

2) Since I’m using Windows and because different Windows Computer has different drive, for the rest of this article, I will use “D:\Programs\libimobiledevice” as the “libimobiledevice download folder”. You have the option to follow or use your own folder preference.

Step 3) Navigate to “libimobiledevice download folder” and unzip the “”

Once downloaded into “libimobiledevice download folder” (inside “D:\Programs\libimobiledevice”), unzip “” file and place all the files into “libimobiledevice download folder” (inside “D:\Programs\libimobiledevice”).

extract dolphinios libimobiledevice
Extracting libimobiledevice

If you do it correctly, you should be able to see “idevice_id.exe”“ideviceimagemounter.exe” and “idevicedebug.exe” under “libimobiledevice download folder” (inside “D:\Programs\libimobiledevice”).

Step 4) Open Command Prompt / Terminal, navigate to “libimobiledevice download folder”

On your Computer and assuming “libimobiledevice download folder” is located at “D:\Programs\libimobiledevice”, do the following:

Step 4a) Click on Windows button, type “Command Prompt”, then press Enter. Command Prompt window will then open.

Step 4b) Inside the Command Prompt window, type “D:” without the double quotes. Then press Enter. If your “libimobiledevice download folder” is different from mine, adjust the command yourself.

Step 4c) Inside the Command Prompt window, type “CD D:\Programs\libimobiledevice” without the double quotes. Then press Enter. If your “libimobiledevice download folder” is different from mine, adjust the command yourself.

If you are doing the steps correctly, now your Command Prompt should be showing the “libimobiledevice download folder” at “D:\Programs\libimobiledevice”.

Article continues below.

Popular on JILAXZONE today:


> Avoid becoming victim of cyber flashing by simply changing this setting on your iPhone and Android.
> How to easily and quickly take full page screenshot on Android 12 without installing 3rd party apps (Works on Chrome too!).
> Here’s how to type with just one hand on your Android.
> Xiaomi: Disable & remove bloatware from MIUI12.
Gaming and Games:

> Valve’s Steam Deck all questions answered!
> 100+ Nintendo Switch Multiplayer games you should play today.
> Best 100 Super Nintendo games of all times.
> Beginner’s guide to Install and Setup Batocera on Raspberry Pi.
iPhone & iOS:

> iOS 17 New, Tips & Tricks.
> Apple iPhone RAM sizes for All models including iPhone 15 series.
> Here’s how to connect and use Nintendo Switch controller on your iPhone and iPad.
> YouTube app that can download videos and play video music in the background.
> Install PS2 emulator on your iPhone & iPad.

> Here’s how you can get and install Windows 11 for FREE legally.
> Credit card hack: cut spending by maximize spending & still paying $0 fees.
> Get rid from annonying telemarketers by doing this 1-time less than 5 mins exercise.
> Here’s how to pay less taxes legally.

Step 5) Getting iPhone UDID via Command Prompt / Terminal

On your Computer and assuming “libimobiledevice download folder” is located at “D:\Programs\libimobiledevice”, do the following:

Step 5a) Inside the Command Prompt window, type “idevice_id.exe” without the double quote. Then press Enter.

Step 5b) Take note of the 25 character (including the “-“) of your iPhone UDID. The iPhone UDID is shown in this format: XXXXXXXX-XXXXXXXXXXXXXXXX (USB).

get iphone udid using idevice_id
Flycast iOS: Executing iDevice_ID to get iPhone UDID

Step 6) Check and get Flycast Package ID.

On your iPhone, do the following:

altstore refresh apps and games within 7 days
Tap on “View App IDs” to get Flycast Package ID

Step 6a) Open AltStore app, then navigate to My Apps. Tap on “View App IDs”.

altstore app id
AltStore App IDs

Step 6b) Find Flycast. Then write down the text you find underneath Flycast. It’s case sensitive, so be careful not to write them wrongly. This text is Flycast Package ID, which is unique on every device. The Flycast Package ID is shown in this format: com.flyinghead.Flycast.YYYYYYYYYY where YYYYYYYYYY refers to your unique Apple Developer Beta ID.

Here’s the template for you, so you don’t need to write it from scratch.


Replace YYYYYYYYYY with your own device unique ID.

Step 7) Download Developer Disk Image.

This image is used to inject the Just-In-Time (JIT) code / program into your iPhone. Download developer disk image according to your iOS version. For example: If you are like me, using iOS 15, then download the developer disk image for iOS 15.

On your Computer, do the following:

Step 7a) Open your Computer browser and click one of the links. For iOS 15, you can go to the Link #1 to get the developer disk image. For other iOS version, check both links to get your correct version.

Step 7b) Once you have found the correct version that match with your iOS version, download the zip file.

Link #Download Link
Link #1
Link #2

If you are like me, using iOS 15, I download the file.

For easier references throughout the article:

Due to different iOS version has different zip filename, for the rest of this article, let’s just call the whichever version of zip file as “developer disk”.

Step 8) Unzip the “developer disk” into “libimobiledevice download folder”

On your Computer and assuming “libimobiledevice download folder” is located at “D:\Programs\libimobiledevice”, do the following:

Step 8a) Unzip “developer disk”.

Step 8b) Check the files generated. If you did it correctly, you should see 2 files: DeveloperDiskImage.dmg and DeveloperDiskImage.dmg.signature.

Step 9) Mount Developer Disk Image

This step requires your iPhone to be in unlock position with screen turned on. If the iPhone screen goes off, the process will fail and throw error.

On your Computer, with Command Prompt window is still opened and assuming “libimobiledevice download folder” is located at “D:\Programs\libimobiledevice”, do the following:

Step 9a) Inside the Command Prompt window, type “ideviceimagemounter.exe D:\Programs\libimobiledevice\DeveloperDiskImage.dmg” without the double quotes. Then press Enter.

mount developer disk image using ideviceImageMounter
Flycast iOS: Executing iDeviceImageMounter to mount Developer Disk Image

Step 9b) Ensure you are getting “Status: Complete” message on Command Prompt window after executing the previous step.

Step 10) Running iDeviceDebug

On your Computer, with Command Prompt window is still opened and assuming “libimobiledevice download folder” is located at “D:\Programs\libimobiledevice”, do the following:

Step 10a) Inside Command Prompt window, type “idevicedebug -u <iPhone UDID> –detach run <Flycast PackageID>” without double quotes.

Replace <iPhone UDID> with your iPhone Unique UDID (check Step 5).
Replace <Flycast Package ID> with your own Flycast unique Package ID (Check Step 6).

Step 10b) Press Enter to execute the command.

Step 10c) If you run the command correctly with correct iPhone UDID and correct Flycast Package ID, Flycast app on your iPhone will open.

Congratulations! You just enable Just-In-Time (JIT) code on Flycast via the tether process. Now, it’s time to celebrate is by playing any of your favorite DreamCast games. At this moment, it’s safe to unplug your iPhone from your Computer.


Because the whole configuration process is a tether process, in which if Flycast on your iPhone is closed / killed, you need to redo the tether process in order to (again) run DreamCast games, so I would suggest you to save these commands on your Computer, so whenever you need them, you just execute them.

Here are the important commands for Command Prompt:
> D:
> CD D:\Programs\libimobiledevice
> idevice_id.exe
> ideviceimagemounter.exe D:\Programs\libimobiledevice\DeveloperDiskImage.dmg
> idevicedebug -u <iPhone UDID> –detach run <Flycast Package ID>

The original tethering guide was discovered by Jkcoxson and Spidy123222 for DolphiniOS (Nintendo Wii emulator for iOS), so all credits go to them. In this article, however, I have personally expanded the guide to be used for Flycast – the DreamCast emulator for iOS – and by giving thorough explanations and steps for easier reading especially to those who are not geeky & not-so technical. In case you would like to see Jkcoxson and Spidy123222 original guide, you can refer to this link:

Important things to note for Flycast iOS

All the steps describe above is called (wired) tether method. Using tether method, enables you to run Flycast to play DreamCast games on your iPhone as long as:

  • Flycast is active in AltStore (Flycast will get inactive within the next 7 days), so don’t forget to refresh. Refer here to refresh when it has been expired: Steps to refresh app inside AltStore when expired at JILAXZONE.
  • Do NOT close nor kill Flycast from the task switcher. If you accidentally close / kill Flycast, you have to redo the tether process to continue playing DreamCast games.
  • Even if you don’t close / kill Flycast, if you are opening too many other apps, at one point, Flycast will get closed automatically by iOS internal process. In that case, you have to redo the tether process.

Bring it all together

flycast ios run dreamcast game
Sonic Adventure running on Flycast iOS

I have personally tested all the steps mentioned above on my iPhone XR running on latest iOS 15 and with Computer running Windows 11 and the result is I can get DreamCast games to run. Few games I have tried personally were Sonic Adventure and Crazy Taxi, in which for both games, I can get good FPS.

So, follow the steps above to get your Flycast running and start playing great DreamCast games!

Check out here for Sega DreamCast games recommendation: Best Sega Dreamcast multiplayer games at JILAXZONE.

Do you have anything you want me to cover on my next article? Write them down on the comment section down below.

Alternatively, find more interesting topics on JILAXZONE:

How-ToPositive Cash FlowAndroid
TravelAll articlesiOS & iPhone

JILAXZONE – Jon’s Interesting Life & Amazing eXperience ZONE.

Hi, thanks for reading my curated article. Since you are here and if you find this article is good and helping you in anyway, help me to spread the words by sharing this article to your family, friends, acquaintances so the benefits do not just stop at you, they will also get the same goodness and benefit from it.

Or if you wish, you can also buy me a coffee:

Thank you!

Live to Share. Share to Live. This blog is my life-long term project, for me to share my experiences and knowledge to the world which hopefully can be fruitful to those who read them and in the end hoping to become my life-long (passive) income.

My apologies. If you see ads appearing on this site and getting annoyed or disturb by them. As much as I want to share everything for free, unfortunately the domain and hosting used to host all these articles are not free. That’s the reason I need the ads running to offset the cost. While I won’t force you to see the ads, but it will be great and helpful if you are willing to turn off the ad-blocker while seeing this site.

7 thoughts on “Flycast iOS: How to fix Flycast keep crashing error | Flycast – DreamCast Emulator for iPhone & iPad

  • October 19, 2021 at 2:31 am

    I get all the way to the end where I input the UDiD and package id but it says cannot find device. Am running 15.0.2 though is that the issue?

    • October 19, 2021 at 7:04 am

      Hi Ryan,

      So I bet you are on Step 10) Running iDeviceDebug.
      Your issue is likely because you copy and paste the command I shown on the article.
      Rather than copying and pasting the command, try write the command down on your own.
      Reason: When you copy the command from my article, the “-” (hyphen) sign somehow is not the normal hyphen.

      Command to type on your own: idevicedebug -u –detach run

      Try again and let me know if you can make it.

  • October 31, 2021 at 4:40 am

    Hey, is there a way to make the app run always like this? it seems like i have to run this program on my computer every time i want to use the app.

    • November 2, 2021 at 6:40 am

      Hi Antonio,

      Currently there’s no better way other than do not close Flycast after playing with it. Keep Flycast on the background after running.

      • November 2, 2021 at 8:17 am

        Ok, thanks for the reply.

  • July 14, 2022 at 7:46 am

    D:\Programs\libimobiledevice> ideviceimagemounter.exe D:\Programs\libimobiledevice\DeveloperDiskImage.dmg
    Uploading D:\Programs\libimobiledevice\DeveloperDiskImage.dmg
    Error: ImageMountFailed

    I keep getting the above msg in command prompt 🙁

    • July 24, 2022 at 4:55 pm

      Hi Miguel,

      Ensure the path you are using is following your Computer directory.
      For example, on my Computer, DeveloperDiskImage.dmg is located is at D:\ drive. On your Computer, it may be located on C:\ drive.


Leave a Reply

Your email address will not be published. Required fields are marked *

Comment moderation is enabled. Your comment may take some time to appear.