Fixed, I managed to get hold on the firmware, if anyone is interested and in need it´s downbelow .
firmwareSX
BE CAREFUL!
SX chassis comes with various different panels(in my case ..AU55) if you have a tv with the same labels as mine you are ready to go otherwise you have to rename the correct file according to your paneltype.
Copy the "Target" directory on a empty 2 GB usbstick(FAT)
pull out powercord on tv
while pressing P+ on the tv plugin powercord you can release pressing when the upgrade message starts.
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Please check you panel type and rename corresponding panel file to Target\BEKO_BIN_FILES\panel\panel.bin
Example for: 32 VLE 8041 S
Panel: LTA320HF05-001 056D32-S22
File PANEL.320SS22.-.F.-.V01.006.00.bin should be renamed to Target\BEKO_BIN_FILES\panel\panel.bin
Then copy Target folder into the root of you USB stick.
IMPORTANT!
USB stick size should be 2 Gb. USB stick should be formated in FAT.
PANEL.320LP22.-.F.-.V01.003.00.bin
PANEL.320LP24.-.F.-.V01.005.00.bin
PANEL.320SS22.-.F.-.V01.006.00.bin
PANEL.320SS23.-.W.-.V01.004.00_2K.bin
PANEL.370LP29.-.F.-.V01.002.00.bin
PANEL.400SS17.-.F.-.V01.004.00.bin
PANEL.400SS20.-.F.-.V01.003.00.bin
PANEL.420LP34.-.F.-.V01.002.00.bin
PANEL.460SS08.-.F.-.V01.005.00.bin
PANEL.SX.260AU26.-.W.-.V01.003.00_2K.bin
PANEL.SX.260LP15.-.W.-.V01.002.00_2K.bin
PANEL.SX.260LP18.-.W.-.V01.001.00_2K.bin
PANEL.SX.260SS6.-.W.-.V01.002.00_2K.bin
PANEL.SX.260SS7.-.W.-.V01.002.00_2K.bin
PANEL.SX.320AU55.-.F.-.V01.003.00_2K.bin
PANEL.SX.320AU56.-.F.-.V01.003.00_2K.bin
PANEL.SX.320AU58.C.F.-.V01.002.00_2K.bin
PANEL.SX.320LP25.-.F.-.V01.002.00_2K.bin
PANEL.SX.320LP27.-.F.-.V01.001.00.2K.bin
PANEL.SX.320LP28.-.F.-.V01.002.00_2K.bin
PANEL.SX.320LP30.B.F.-.V01.001.00_2K.bin
PANEL.SX.320SS26.-.F.-.V01.002.00_2K.bin
PANEL.SX.320SS28.-.F.-.V01.003.00_2K.bin
PANEL.SX.320SS28.B.F.-.V01.003.00_2K.bin
PANEL.SX.320SS29.B.F.-.V01.002.00_2K.bin
PANEL.SX.320SS31.-.W.-.V01.001.00_2K.bin
PANEL.SX.320SS32.-.F.-.V01.001.00_2K.bin
PANEL.SX.320SS33.B.F.-.V01.001.00_2k.bin
PANEL.SX.320SS33.C.F.-.V01.001.00_2K.bin
PANEL.SX.370LP28.C.F.-.V01.001.00_2K.bin
PANEL.SX.400SS21.-.F.-.V01.003.00.bin
PANEL.SX.400SS21.A.F.-.V01.004.00_2K.bin
PANEL.SX.400SS21.B.F.-.V01.002.00_2K.bin
PANEL.SX.400SS22.-.F.-.V01.002.00_2K.bin
PANEL.SX.400SS23.B.F.-.V01.002.00_2K.bin
PANEL.SX.420LP32.-.F.-.V01.001.00_2K.bin
PANEL.SX.460SS10.-.F.-.V01.001.00_2K.bin
PANEL.SX.460SS13.-.F.-.V01.002.00_2K.bin
PANEL.SX.460SS15.A.F.-.V01.002.00_2K.bin
PANEL.SX.550SS02.-.F.-.V01.003.00.bin
panel_empty.bin