I bought the LG BU40N with firmware 1.03
(copying with DVDFAB was not possible ... read errors))
Downgrade with the tools in the first post failed (error #4)
Crosscraded to 1.03 MK with the tool linked on this page 26 of the thread.
(copying with DVDFAB was not possible)
Downgraded to Firmware DE_LG_BU40N_1.00 with the tools in the first post of this thread ... worked!
Copying "Man in Black 4k" with DVDFAB worked.
![Very Happy :D](./images/smilies/icon_biggrin.gif)