Hi All.
My Switch was running OFW Firmware 9.0.0 CFW: Atmosphere 0.9.4
Rolledback to an known working 8.1.0 Nand Back UP and then the switch could not boot into OFW anymore.
Checked with BRiccmii > 11 Fuses burnt, even tough 9.0.0 was installed with ChoiDujourNX to prevent exactly that.
After...