How to fix The "Couldn't Install On USB Storage Or SD Card" Problem On Android

 

My phone recently couldn’t upgrade any apps that’s on SD card. So I tried to search online for a solution, turns out it to be an Android bug. And HERE is the solution:

“Go and delete smdl2tmp1.asec yourself. From what I can tell, it could reside in 2 locations:

1. /sdcard/.android_secure - this is an invisible folder on your SD card, which you can access with any file manager, like ASTRO
2. /mnt/secure/asec/ - access to this folder requires root and a program like Root Explorer

Look for smdl2tmp1.asec in these folders and delete any ones you see. Deleting it seems to be a safe enough operation - it's just a temporary file after all. Once you've done that, all the update problems should go away.”