Revert "Merge pull request #7 from michaelwu/bug-979625"

This reverts commit 9c4d35857e6a2843aa240e1465aa51780eaf99f6.
Revert "Bug #1003645 [Tarako][FOTA] Need a setting for update from /sdcard"

This reverts commit fd2c7659d9dfa8736ee6d55794465d0aefc96c05.