100% confirmed working method to dump your 3120L flash (yes, including key)
plscsi -p -v -x "E7 48 49 54 01 00 91 00 00 00 D0 00" -i xD000 -t d0.bin
plscsi -p -v -x "E7 48 49 54 01 00 91 00 D0 00 D0 00" -i xD000 -t d1.bin
plscsi -p -v -x "E7 48 49 54 01 00 91 01 A0 00 D0 00" -i xD000 -t d2.bin
plscsi -p -v -x "E7 48 49 54 01 00 91 02 70 00 D0 00" -i xD000 -t d3.bin
plscsi -p -v -x "E7 48 49 54 01 00 91 03 40 00 C0 00" -i xC000 -t d4.bin
copy /b d0.bin+d1.bin+d2.bin+d3.bin+d4.bin 3120L_descrambled.bin
No, I didn't try this myself, all credits go to the little birdie .. :)