How to eraese defekt SPI ?

[linuxfreund]

Hi there,
unfortunately I've filled the SPI with garbage while updating to new U-Boot.
U-Boot SPL 2024.04-rc2 (Feb 14 2024 - 00:00:00 +0000)
Trying to boot from SPI
Trying to boot from MMC1
Card did not respond to voltage select! : -110
spl: mmc init failed with error: -95
Trying to boot from SPI
Trying to boot from MMC2
Card did not respond to voltage select! : -110
spl: mmc init failed with error: -95
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###

Question: how to reset the bord and flash a correct version of U-Boot? Pressing the "Reset" button didn't help.

Thanks
Andreas