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Is there some other device you can ping to see if the issue is the host or the FPGA card?

Le acabo de poner una pica de tierra al lado de la pata de la mesa en la parte de atras para tener tierra totalmente separada.

Me puedes confirmar lo de single ended.

Gracias

Hard to tell if this is a EPP interface issue or maybe a Mesaflash problem

Can you try:

Power up on alternate EEPROM (which should have a valid boot sector)

program FPGA via JTAG (NOT FLASH!)

Then try mesaflash again to write a standard EPP bitfile

If this does not work, a temporary workaround (if you are building you own firmware)
would be to write the flash via JTAG

Thank you, I will try and report

Sigi