For all those having trouble installing cIOS222, assuming you already have 249 Rev13a installed. You will need a network connection for this to work.
1) delete the 000000001 directory from your SD card
2) I recommend running
IOS downgrader, this is different to cIOS downgrader and won't affect your system menu, this will prevent errors while installing certain hacks and homebrew when running higher system menus 3.3, 4.0.
3) Install
Hermes cIOS. 3 times.
3a) Install to 202 using IOS36 - Only require for movie players like MplayerCE.
3b) Install to 222 using 36 mixed with 38 (some people say 36 only but 36,38 works for me)
3c) Install to 223 using 36 mixed with 37
4) Delete all config files fromm the SD
5) Run up loader (unlock) and choose IOS222 under global game settings.
6) restart the loader
7) Test each game.
7a) If a game gets stuck on a black screen it usually just needs the video mode tweaked, try a few in the settigs for that game only (loader unlocked).
7b) If a game requires a disk in the drive to run (Metroid, De-blob) then change the custom game settings for that game to IOS249.
7c) If a game gets stuck on a green screen, change the custom game settings for that game to IOS249, 002 fix on.
I think the settings for newer games have been covered many times over in recent posts.
I also find it useful to dump, format and then re-copy everything back to the SD once large changes have been made, this can prevent some loader hangs (A bit of speculation here but it makes sense and works for me)
Let me know if I have missed anything or have screwed up somewhere in these instructions.
Cheers