Creative camera usb sticks

Creative drivers usb sticks appear as a read only cd-rom when inserted in a pc. They can be converted to a rw usb stick.
The chip is  phison ps2251-50-f
It can be reprogrammed using the Phison_MPALL_v3.29.0B_PS2251 tool
this worked: Controller PS2251-50, FC1-FC2 0xFF-01, No. of Partition 1, Removable disk, Preformat(low level format) checked