Do you have a windows based OS for your PC Bauldrick2 ?
If yes delete the ul.cfg from the directory and use USBUTIL v2.
Select Recover list of Games ( Ctrl + R ) from Utils in menu.
Browse to the NAS share and let it scan the directory.
It will create a new ul.cfg in the directory with all games that it can find.
Select Close ul.cfg from File in menu.
After that all should be fine.
If you running any Linux system as OS you can try to execute USBUTIL from wine or any other win emulator but i can't tell you if it work or not. That would be a test that a linux user have to perform.
PS2 SCPH-70004 V12 PAL + HDCOMBO + 160 GB Samsung HDD + OPL 0.9.1
PS2 SCPH-70004a V13 PAL Satin Silver
2 x Official Sony 8mb card +FMCB 1.8c + uLE 4.42b
Datel Max Memory 32mb card +FMCB 1.8b + uLE 4.42
Memor32 + Memento FW 1.2e