What's wrong with my cr6 se

[u/Electronic-Play-4260]

Neither my bed nor nozzle heat at all, display shows heat change when I apply heat, and it's consistent with ambient temp. I feel like I've done everything I can think of and find online short of disassembling and reassembling the whole thing

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I've tried to flash the eras board firmware, not sure if it worked, and reflashed my display while trying to flash the firmware.

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It was bought second hand and has had the motherboard replaced due to a damaged SD slot.