Back to bios: Removing battery helped me. If you wanna do it like me, read "update" at the end of this posting.
Just shoot my bios. I downloaded Firmware B11F1P03 from Foxconn and flashed it in Windows. Rebooted, loaded defaults, changed boot sequence to HD only. Bam! System dead. Recovery from #32 was'nt successfull. 4h laters, system is running again.
There is an official guide for recovery amibios:
AMIBIOS8_Flash_Recovery_Whitepaper_v10.pdf. Summed up: Bios consists of 3 stages. Boot block, storage and Main Bios Image. The boot block is first loaded and checks the main bios. If the main bios is corrupt, it will fail back to recovery mode. This means: Searching on all media for AMIBOOT.ROM for reflashing. All media per default are disabled. Vendor has to enable it.
Recovery was not active, because the bios is not corrupt. There has to be something other gone bad. No media was accepted. So i opened the case again and searched for a flash eeprom, a reset pin or the battery. I found 2 debug connectors and 1 battery on the downside. Removing the battery and powering on again - System runs and directly goes into bios. Boot sequence has been changed to CD/DVD. I thing Foxconn has messed up with some preconfigured bios settings, so you has to wipe it out by the updater (which afudos generally does, but not the buggy windows flasher).
Sometimes you could save lot of time by just remembering the good old days. On some intel boards, you are attended to remove the battery and do a hard reset of the bios after flashing it. Nothing has changed these days.
update: After removing battery, don't go into bios. If you change there the boot sequence, you will get stucked again. If you do it, you have to reset the bios settings with shorting. Connect a simple CD-Drive, boot up there a Win7 (or something like this). Connect a usb stick with bios B11F1P03 and the windows flasher. Advance in Windows Setup to the command prompt and call the windows command line bios updater with the same parameters like the dos version. :-)
PS: Funny day.