Ok, if both sim have the same result it's impossible that both sims are defective.

So next point is the motherboard, you can find more details about it on Johnny's Forum, jb8a8f8, he can tell you which component to check on the motherboard as perhaps just the 5 volt is not arriving, but it looks like to me different... as it says it finds the card...

found card in unknown state
cannot decrypt datablock_signed-cert
retrying.. card if inited
found card in unknown state
cannot decrypt datablock_signed-cert
retrying.. card if inited
found card in unknown state
cannot decrypt datablock_signed-cert
retrying.. card if inited
found card in unknown state
cannot decrypt datablock_signed-cert
retrying.. card if inited
found card in unknown state
cannot decrypt datablock_signed-cert
retrying.. card if inited
set pwm to 200/255
TPM error. Please contact Dreambox support

Like if boot/SSL partition was updated to Dreambox SSL and not the clone SSL...

Johnny's jb8a8f8 Forum section for DM900UHD : https://jb8a8f8.com/support/index.php?categories/dm900-uhd.45/

Can you post a photo of the motherboard here ? Just to be sure it's the clone motherboard and not the original motherboard (we never know). Also did you flashed a Japhar Image while you have the Japhar sim in the box ? Try and let us know for the log.

Perhaps reflashing the DM900UHD Japhar Sim into Dream Japhar OS version, we could avoid/fix this problem... do you have a PC/SC Smartcard reader ?

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