your slim drive is no longer writable. the 13599 and 13146 updates locked the SPI on the board so you cannot flash them as-is. You need to figure out what chip you have and then proceed :How to tell if Liteon DG-16D4S is MXIC or Winbond SPI - Team Xecuter
if you have an mxic, you need either an unlocked pcb, sputnik360 or sputnik360 probe. the two latter ones requires soldering, trace cuts & repairs.
if you have a winbond you need an unlocked pcb or to perform the kamizkaze which requires you to drill into the chip as well as to have a few other pieces of hardware.