| IOS21 |
 |
| Technical info |
|---|
| Type | Common IOS |
|---|
| Status | Active |
|---|
IOS21 is most commonly used by third-party games. It also contains the NAND Boot Program developer tool, just like IOS15. Most debugging messages have been removed, though.
It probably had the connection fixes advertised for 2.2. Many games such as Wii Sports were also rereleased under this IOS with a newer strap screen, probably in response to TVs getting smashed.
This IOS was used by older versions of DataChk, a factory title.
Version history
| Version
|
Signing bug?
|
/dev/flash access?
|
ES_Identify?
|
STM Release Exploit?
|
STM IOCTL overflow?
|
SDI register index bug?
|
Notes
|
| v512
|
Yes
|
Yes
|
Yes
|
Yes
|
Yes
|
Yes
|
First release
|
| v514
|
Yes
|
Yes
|
Yes
|
Yes
|
Yes
|
Yes
|
|
| v515
|
Yes
|
Yes
|
Yes
|
Yes
|
Yes
|
Yes
|
|
| v516
|
Yes
|
Yes
|
Yes
|
Yes
|
Yes
|
Yes
|
|
| v517
|
Yes
|
Yes
|
Yes
|
Yes
|
Yes
|
Yes
|
Available on NUS
|
| v522
|
No
|
No
|
No
|
Yes
|
Yes
|
Yes
|
|
| v525
|
No
|
No
|
No
|
No
|
Yes
|
Yes
|
|
| v782
|
No
|
No
|
No
|
No
|
Yes
|
Yes
|
|
| v1038
|
No
|
No
|
No
|
No
|
Yes
|
Yes
|
|
| v1039
|
No
|
No
|
No
|
No
|
Yes
|
Yes
|
|
| v1295
|
No
|
No
|
No
|
No
|
Yes
|
Yes
|
Only found on vWii and newer RVL-101 units.
|
| v26895
|
No
|
No
|
No
|
No
|
Yes
|
Yes
|
Only found on Wii mini
|
