UDPIH: USB Host Stack exploit + Recovery Menu

It's been a while without any major exploits in the Wii U scene, so I present to you:

USB Descriptor Parsing Is Hard (UDPIH)

An exploit for the Wii U's USB Host Stack. Pronounced like "mud pie" without the M.

The write-up can be found here!

What does this mean?​

Since the USB Stack is running before anything on the PPC side of the Wii U is booted, this allows unbricking things like CBHC bricks without any soldering!


Supported devices:​

  • Raspberry Pi Pico (W) / Pico 2 (W)
  • Raspberry Pi Zero (W) / A / A+ / Zero 2 W / 4 / 5
  • Steam Deck
  • Espressif ESP32 S2 / S3
  • Nintendo Switch capable of running udpih_nxpayload

Instructions​

Device Setup​

Follow the setup guide for the device you want to use below:

Booting the recovery_menu​

warning
Important notes for this to work:
  • Make sure no other USB devices are attached to the console.
  • Only use USB ports on the front of the console, the back ports will not work.
  • If your console has standby mode enabled, pull the power plug and turn it on from a full coldboot state.
  • Copy the latest release of the recovery_menu to the root of your FAT32 formatted SD Card.
  • Insert the SD Card into the console and power it on.
  • As soon as you see the "Wii U" logo on the TV or Gamepad plug in your prepared UDPIH device.
    This timing is important. If you're already in the menu, the exploit won't work.
    Depending on the device, you might have to plug it in sooner or later. This might take several attempts.
    If you get no video output or a distorted screen, your timing was most likely wrong.
  • After a few seconds you should be in the recovery menu.
So what's this recovery menu? The recovery menu allows you to fix several bricks:
screenshot

Wii U Recovery Menu

A simple recovery menu running on the IOSU for unbricking.

Options​

Set Coldboot Title
Allows changing the current title the console boots to.
Useful for unbricking CBHC bricks.
Possible options are:
  • Wii U Menu (JPN) - 00050010-10040000
  • Wii U Menu (USA) - 00050010-10040100
  • Wii U Menu (EUR) - 00050010-10040200
On non-retail systems the following additional options are available:
  • System Config Tool - 00050010-1F700500
  • DEVMENU (pre-2.09) - 00050010-1F7001FF
  • Kiosk Menu - 00050010-1FA81000
Dump Syslogs
Copies all system logs to a logs folder on the root of the SD Card.

Dump OTP + SEEPROM
Dumps the OTP and SEEPROM to otp.bin and seeprom.bin on the root of the SD Card.

Start wupserver
Starts wupserver which allows connecting to the console from a PC using wupclient.

Load Network Configuration
Loads a network configuration from the SD, and temporarily applies it to use wupserver.
The configurations will be loaded from a network.cfg file on the root of your SD.
For using the ethernet adapter, the file should look like this:
Code:
type=eth

For using wifi:
Code:
type=wifi
ssid=ssidhere
key=wifikeyhere
key_type=WPA2_PSK_AES

Pair Gamepad
Displays the Gamepad Pin and allows pairing a Gamepad to the system. Also bypasses any region checks while pairing.
The numeric values represent the following symbols: ♠ = 0, ♥ = 1, ♦ = 2, ♣ = 3.
Note that rebooting the system might be required to use the newly paired gamepad.

Install WUP
Installs a valid signed WUP from the install folder on the root of your SD Card.
Don't place the WUP into any subfolders.

Edit Parental Controls
Displays the current Parental Controls pin configuration.
Allows disabling Parental Controls.

Debug System Region
Fixes bricks caused by setting productArea and/or gameRegion to an invalid value. Symptoms include being unable to launch System Settings or other in-region titles.

System Information
Displays info about several parts of the system.
Including serial number, manufacturing date, console type, regions, memory devices...

Load BOOT1 payload
Loads a payload from the root of the SD Card named boot1.img and executes it from within boot1.
If the file is named boot1now.img it gets loaded automatically when starting the recovery_menu after a 5 second timeout.

Credits​

Special thanks to Maschell, rw-r-r-0644, QuarkTheAwesome, vgmoose, exjam, dimok789, and everyone else who contributed to the Wii U scene!
 
Last edited by GaryOderNichts,
Do you know how I can uninstall games from the nand using recovery menu? I guess it can be done using wupserver but I dunno any commands that allows me to do this. Sadly I also couldn't find much about wupserver when I searched the internet for it.

I need to uninstall games from the nand becuz my Wii U has a locked account and not enough memory to create a new account.
I would be really happy if you could help me :yayu:
 
@gary is the rpx replacement payload working? I saw there was a download in the actions section, but no matter how many times I try it doesn't work, it boots to the WiiU Menu but if I try to load a Channel (which is supposed to load a launch.rpx file from the root) it just boots the Channel normally :P Is there any way to confirm it has worked?

I can boot the default exploit fine, I'm using the NX Payload on switch to boot the exploit.
 
@gary is the rpx replacement payload working? I saw there was a download in the actions section, but no matter how many times I try it doesn't work, it boots to the WiiU Menu but if I try to load a Channel (which is supposed to load a launch.rpx file from the root) it just boots the Channel normally :P Is there any way to confirm it has worked?

I can boot the default exploit fine, I'm using the NX Payload on switch to boot the exploit.
It should work, at least from the testing I've done.
I uploaded another build on discord which might work: https://cdn.discordapp.com/attachments/279783073497874442/992148005052493915/recovery_menu
 
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It should work, at least from the testing I've done.
I uploaded another build on discord which might work: https://cdn.discordapp.com/attachments/279783073497874442/992148005052493915/recovery_menu
Thank You, I'll try it out. Is there a confirmation on success, obviously you can tell the udpih exploit works because it boots to the Recover Menu but for the RPX Replacment when successful it boots to the System Menu?
The only way to know for sure would be to boot a Channel after it loads the system Menu and see if it boots the Launch.rpx from root?
 
@gary it still doesnt want to catch, I think it could probably be the Switch payload, even though it works for the default recovery menu..
I have a Pico in the post I'll check again once that turns up..
The full permissions and codegen access sounds very nice :D
 
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Hi GaryOderNichts so I have a question. My son bricked his wiiu by formatting after cbhc. So I tr ried the hardwood. It said the process was successful so put everything back together removed wired from teensy but it would still not boot. So I tried again to rewrite to the wiiu . The wiiu is recognized but the write always fails. Also now when I try to turn it on nothing happens. Is there a chance that your method would work to tecover this wiiu?
 
Hi GaryOderNichts so I have a question. My son bricked his wiiu by formatting after cbhc. So I tr ried the hardwood. It said the process was successful so put everything back together removed wired from teensy but it would still not boot. So I tried again to rewrite to the wiiu . The wiiu is recognized but the write always fails. Also now when I try to turn it on nothing happens. Is there a chance that your method would work to tecover this wiiu?
What happens when you boot up the Wii u?
 
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