Copy the covers IN the folder cover to oman46765/covers  (w/e those #'s are) 

Flex Manager v1.0.1 Features:
 It installs just like Open Manager (in OMAN46756).
 The covers (size: 348◊400) are stored in: / dev_hdd0 / game / OMAN46756 / covers / BLESxxxx.PNG (itís important that the extension is in capital letters).
 If you have Open Manager installed, this overwrites it keeping your backed up games intact.