Developer's note:

This is a Custom IOS, an IOS modified to add some new features. Not available in the official IOS. This IOS has been made to be used ONLY with homebrew software. The Custom IOS installs into a free slot and it does not modify any other IOS so it is secure to install.

Released the rev20b installer. The previous version of the installer had a bug that doesn't let finish the install process in some consoles. This new version has this bug fixed. If you were able to install rev20 without problems you do NOT need to install this new version.

Changelog:
- Added support for IOS36, IOS53, IOS55, IOS56, IOS61 and IOS80.
- Updated the bases IOS37, IOS38 and IOS57.
- The installer now supports GameCube controls.
- The installer now supports custom slots.
- The installer network code improved.
- Fixed timers IOS modules.
- Modulo MLoad improved (new calls and corrections).
- FAT module rewritten (using FatFs).
- Enhanced Module SDHC (buffers and cache).
- Improved DIP plug.
- ES plugin added.
- Improved plugin FFS.
- Implemented IOS reload block (only works properly with DVD titles).
- The titles identified can not use custom modules.
- Improved NAND Emulator (corrections and use of new module FAT).
- Protection of MEM2 disabled by default.
- Set the flag AHBPROT for access to HW from the PPC.
- Easter Egg added.
- Corrections and improvements.