Thanks for your answers.
Yes it’s bought at AliExpress (it’s a similar product, the original shop where I bought it are temporary closed: https://es.aliexpress.com/item/1005005188913454.html). Maybe could be a scam but I had coupons and the price and storage seemed good so why not try? :D
The info showed by the device is:
048d:1234 Integrated Technology Express, Inc. Chipsbank CBM2199 Flash Drive
Size reported by Gparted: 61.04 TiB , 67.1 TB
Maybe it could be reliableless but I’d like to try. Copying directly the Batocera .img file makes the device with an unrecognized partition table so I had to do it manually. Partitions in GPT mode are seen by several drive partition utilities but it cannot be seen by UEFI nor CSM so it cannot boot. I think because it’s a 4kn drive (4k physical and logical sector size) and UEFI nor CSM cannot boot with this.
I’m afraid that I’ll have to boot from another USB device … I dont’ know.
Thanks.