As suspected, all has failed, new mainboard on order and a harsh lesson learned.
Thanks for your help
With v290 you also need a correct IOS30. If you are able to start a wadmanager you can install an IOS30 WAD. I have been reading about the latest cboot2 and as far as I understand this will boot from your IOS bootmii and than you can instal a fresh IOS30. Google cboot2 wadmanager and let me know if it worked.
Happy modding TdT.