I then uninstalled the v2.1 (was thinking that should have cleared all previous installation stuffs)
Now none of the VSCO apk versions I have on hand is now able to install, all of them (including the original successful version of v2.1) failed with the error "Application not installed".
After few days of searches and reading, I suspect this could be due to corrupted AndroidManifest.xml, and/or not correctly signed.
Is there anything I can do to get it fixed ?
Can someone help me out on this ?
I certainly do not wish to do a factory reset
Thanks in advance on all help.