I was wrong to download this firmware. A big mistake.
Yes, I can put any firmware you recommend. The board only turns on the network light, nothing else. And it doesn't read the pendrive, it doesn't even turn on the pendrive light, as if it had no power.
I already bought the TTL cable, I'm waiting and it should arrive tomorrow. I bought this model with drivers:
https://produto.mercadolivre.com.br/MLB-2200958817-1-x-cabo-ftdi-usb-a-para-ttl-rs232-pl2303hx-4-pinosnf-_JM?quantity=1
I looked at how to upload the OS using TTL and it doesn't seem to be simple, but it isn't complex either. I am going to try.
Thank you for your help, BTC UP and the machine stopped... :-( I'm an enthusiast, I bought 30 S19 90Th. But I still don't have that knowledge in terms of maintenance.
Best Regards,