How can I erase all the external flash or better?

I seem to have bricked my daisy seed. :frowning:
Using the web programmer I can program the blink example and also the bootloader.
After I have flashed the bootloader it no longer goes directly to the slow blinking mode, but does this after a few seconds. If I then press the button, I get the fast blinking and then the mode which seems to go into the long bootloader mode. If I then upload a program (Plugdate BIG), it does not work.

Opening DFU capable USB device...
ID 0483:df11
Run-time device DFU version 011a
Claiming USB DFU Interface...
Setting Alternate Setting #0 ...
Determining device status: state = dfuIDLE, status = 0
dfuIDLE, continuing
DFU mode device DFU version 011a
Device returned transfer size 4096
DfuSe interface name: "Flash "
Downloading element to address = 0x90040000, size = 227156

Erase   	[                         ]   0%            0 bytesWarning: Invalid DFU suffix signature
A valid DFU suffix will be required in a future dfu-util release!!!
Error during special command "ERASE_PAGE" get_status
make: *** [../../libdaisy/core/Makefile:330: program-dfu] Error 74

How can I erase all the external Flash?
Thanks a lot!

… after some trials I must say, that the QSPI Flash is gone. My attempts to write and read it did not succeed. The failure happened, when I cycled the power supply, while Daisy was running. Some spike must have killed the flash. I don’t know about the other peripherals.

I had to switch over to a second Daisy.

Indeed, if you see a failure like this where the DFU protocol fails to erase or write to flash, that generally indicates a hardware failure of some sort. It seems a little strange that a mere power cycle would knock it out, though.