I have a rooted Samsung Galaxy Y (GT-S5360L), which I recently factory reset. Now I have a problem: whenever I try to install most apps it gives the error " Unable to install on USB storage or SD card." I Googled and found 2 solutions: one to delete a cache file, and the other to unmount the sd card while installing. The cache file was sm2dltmp or something like that located in either /sdcard/.android_secure or /mnt/secure/asec. I used rooted terminal emulator to look in both and I did not find the file. I did however, find a bunch of .asec files for apps I used to have before I reset my phone. I moved those to a backup directory, but still installing apps gave me the same error. So far I have only been able to install apps using the second method, unmounting the sd card. All help would be greatly appreciated.