If you have the same video card, then download the BIOS firmware from it and replace the BIOS on the problematic video card. But always keep backups.
The RTX 2070 is perfectly flashed with the nvflash64 utility, and the BIOS can be used from a similar video card. But keep the original one to establish a warranty call.
Thank you for your message!
Unfortunately among my other gpus I don't have another one exactly the same. I'll try and see if I can download its firmware from the internet.
I don't have experience in flashing gpus. Do you have some tutorial to suggest?
Thanks in advance