Same issue also on GT-I9000 (Samsung galaxy S), no way to install stock apps from the same phone.
- I took 3 stock apps from original ROM (Gingerbread): DLNA, FM Radio and Double Watch.
- I changed the phone ROM to CM9 (ICS)
- I copied the files, changed permissions, rebooted, etc.
No way, stock apps are not there
I'm wondering if it is just an android version issue (Gingerbread vs ICS. 3 apk over 3?! is unlikely), or if I'm still missing something (I go through all the steps and I double checked permissions etc.)