I had a Switch which doesn t want to start. Black screen after Nintendo Logo.
It was a missmatch of the burnt fuses (fuse count as downgrade protection) and the version of the firmware on the NAND. If it is an unpatched Switch I would check if Hekate is able to be loaded and if so, check the fuse count and update the firmware (matching the fuse count) with ChoiDujourNX.
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