Stealth Unlocker is a replacement ROM for your Playstation cheat cartridge such as the GameShark, Action Replay, or countless clones. Stealth Unlocker gives you a plug and play modchip for any Playstation with the Parallel I/O port, no soldering required. You will be able to load Unlicensed and Import discs on your console. It was programmed 100% in assembly language.

Download:
Stealth Unlocker ( 220814c )

Features for American, PAL, and Net Yaroze Consoles:
Features for Japanese and Asian Consoles:
Note: Japanese and Asian consoles have the NTSC/J ( SCEI ) CD-ROM controller which does not support the secret unlock. This is why the CD Player Swap Trick is restored on those consoles. This does mean you will not be able to change discs mid-game. Most multi-disc games allow you to save before the disc change but there are a few which do not. 

Requirements:
Installing Stealth Unlocker:

The process of installing Stealth Unlocker on your cheat cartridge is very simple if your cartridge has EEPROM. GameShark and official Pro Action Replay cartridges will have EEPROM. Clones may not. If you can add and save new cheat codes to the cartridge it should probably have EEPROM. Once you have your cartridge with EEPROM you simply burn the ISO image containing the NXFlash program to a CD-R and boot it on any Playstation console with the Cheat Cartridge plugged in. Use the menu to choose to install Stealth Unlocker. If your cheat cartridge does not have EEPROM inside and instead has a OTP ROM inside like an EPROM you could still install Stealth Unlocker if you use a chip programmer and desolder the old ROM chip and replace it with one that has Stealth Unlocker programmed on it.

Options for booting the installer CD-R:
If you do not have access to a modded PS1 console and do not have a way to put data onto a PS1 memory card your best option is the Swap Trick. There are a variety of swap tricks possible. Some are easier than others. The most direct route would be to start your console into the cheat cartridge menu with an original game CD-ROM in the console with the lid switch held down by an object so you can have the lid open but the console thinks it is closed. Wait for the console to verify the disc and then carefully remove it and replace it with the installer CD-R. You should hopefully then be able to select the Start Game option in the menu and see the installer. If that does not work you may need to look into other swap trick methods. An easy one to use that I created is called PS1 Demo Swap. It is a program that will take an ISO of a demo disc you have the original of and patch it to load TonyHax when a certain demo program is loaded. Then you could use it to boot the installer CD-R.


Why doesn't the Anti-Mod protection patch from TonyHax work on Japanese consoles?

The way the TonyHax anti-mod patch works to bypass the protection only works on systems which have unlocked drives. All the protection checks still happen but when they fail the anti-mod patch basically changes the result to a pass. The problem for Japanese consoles is that one of the protection routines is a secondary disc check which results in no longer being able to read from the disc because we used a Swap Trick. Protected games can be supported in the future on a game by game basis.