Yiaay it worked, thank you SO MUCH.
I feel stupid I did not tried that, I guess I just panicked. Grub goes really fast and I forgot I have that option if I pay attention and rush to it.
After booting in a previous kernel the update finished, and I rebooted twice just to check. I am writing this lines from my laptop.
I googled how to check how many firmwares I have and this is what I got:
toniblanco@fedora:~$ rpm -qa kernel
kernel-6.17.5-200.fc42.x86_64
kernel-6.17.6-200.fc42.x86_64
kernel-6.17.7-200.fc42.x86_64
I found this related thread. Since having older kernels saved me this time, I am reluctant to erase the old ones to free /boot partition space. Is there any other way to free space I missed?
Again, thank you so much for your help.
Toni