Hacking JGecko U Setup Guide

[Sheeba-]

I was able to resolve my issue by downgrading TCP gecko from version 2.53 to 2.5 (specifically to the patch that addressed a Smash 4 crash in late 2017).
Leaving that here in case it helps anyone else. Everything else worked great. Thanks a bunch for these tools.

Good that you figured it out, I'll keep this in mind for pretendo

 

[bbk0102]

Where do I find cheat codes?

 

[szczuru]

Is there any way to run server on Aroma?

 

[Geometomas]

What is JGecko U?
It's a gecko cheating client & RAM Debugger for PC (Windows, Mac and Linux).

Why not use TCP Gecko.NET?

• JGecko U is written in Java and is platform-independent
• JGecko U has a cheat code manager
• JGecko U has less bugs
• JGecko U has exclusively been written for the Wii U so no broken features
• JGecko U is still in development (kinda)
• JGecko U works on every Wii U firmware alike
• JGecko U has a remote procedure call tab
• JGecko U has a few other unique features

Where can I see it in action?
Here.

Is there anything I have to install on my computer?
Yes, Java. Following this tutorial.

Great, how do I use JGecko U now?
Here is a video tutorial for setting up your SD Card and Wii U for using JGecko U (caution: slightly outdated):

Spoiler: Video Tutorial

Required download links:

Spoiler

Homebrew Launcher
TCP Gecko Installer <- You HAVE to use this one. If you don't and complain I will hit you
JGecko U

Your SD Card should contain the following files and folders:

wiiu/apps/homebrew_launcher/icon.png
wiiu/apps/homebrew_launcher/homebrew_launcher.rpx
wiiu/apps/homebrew_launcher/meta.xml

wiiu/apps/tcpgecko/tcpgecko.elf
wiiu/apps/tcpgecko/icon.png
wiiu/apps/tcpgecko/meta.xml

The TCP Gecko files can all be downloaded from here.

NOTE:
I recommend using the updater for JGecko U and TCP Gecko (instead of collecting the files manually).

How do I get SD card cheats working?
I made a video for this:

Spoiler

How does the program interface look like?

Spoiler

Please give me an idiot-friendly step-by-step written guide for JGecko U codes:

Spoiler

1. Download JGecko U.jar.
2. Make sure you have JRE (Java Runtime Environment) installed.
3. Double click JGecko U.jar like any other *.exe file (JGecko U will create files and folders in its current directory on the first start so you may want to place it in a separate folder).
4. Put the IP Address of your Wii U into the "IPv4 Address" field and press the "Connect" button.
5. Press the "Add Codes" button in the "Codes" tab.
6. Enter the name of the cheat code (in the "Title" field) and the code itself (in the "Code" field). Press "OK".
7. Repeat step 5 and 6 if you have more codes.
8. Check the codes you want to activate and press the "Send Codes" button.

The codes should now be active in-game.

(Thanks tastymeatball for this post)

I get an error, how do I report it?

Spoiler

First of all, follow this post and re-download all files especially. Seriously. If you don't, I'll be pissed for this reason. Then, post and include the full error message (also called stack trace) in text form. If you can't, posting a screenshot is okay, too. I can only analyze the error properly if you supply a textual representation so really make sure you paste it from your clipboard after you got the error since JGecko U automatically copies errors to your system's clipboard.

im getting this error after touching "Disable codes", do you know how to fix it?

java.net.SocketException: Connection reset by peer
at java.base/sun.nio.ch.NioSocketImpl.implWrite(NioSocketImpl.java:418)
at java.base/sun.nio.ch.NioSocketImpl.write(NioSocketImpl.java:438)
at java.base/sun.nio.ch.NioSocketImpl$2.write(NioSocketImpl.java:817)
at java.base/java.net.Socket$SocketOutputStream.write(Socket.java:1120)
at java.base/java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:125)
at java.base/java.io.BufferedOutputStream.implFlush(BufferedOutputStream.java:252)
at java.base/java.io.BufferedOutputStream.flush(BufferedOutputStream.java:240)
at java.base/java.io.DataOutputStream.flush(DataOutputStream.java:129)
at TZ.h(sbb:185)
at TZ.h(sbb:253)
at TZ.D(sbb:173)
at yc.D(ws:334)
at yc.d(ws:775)
at yc.D(ws:706)
at yB.Bc(ol:2321)
at yB.a(ol:3958)
at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1972)
at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2314)
at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:407)
at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)
at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:279)
at java.desktop/java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:297)
at java.desktop/java.awt.Component.processMouseEvent(Component.java:6620)
at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3398)
at java.desktop/java.awt.Component.processEvent(Component.java:6385)
at java.desktop/java.awt.Container.processEvent(Container.java:2266)
at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:4995)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2324)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4827)
at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4948)
at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4575)
at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4516)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2310)
at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2780)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4827)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:775)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:720)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:714)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:98)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:747)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:744)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)