20.04 - Fix Wifi issue network unclaimed (AX201)

I don't have Wifi on my laptop (Dell, Linux Ubuntu 20.04 no dualboot) since I rebooted it. Before, I had no problem and I did not change anything. On the reboot, I had a blue screen talking about "MOK Management" and I choose to "Continue boot". Once on the OS, resolution has been changed and I lost Wifi options. I rebooted it again, resolution has came back to normal but still no Wifi. Oh and I can't connect though Ethernet either.

Here are some infos, sorry for the quality I had to take it myself with my phone : kernel 5.11, Wifi Intel AX201 https://ibb.co/N24wzrt

I saw a lot of answers about it but I can't make it works so if you can help me, it would be great.

EDIT :

Result of sudo modprobe iwlwifi && sudo dmesg | grep iwl :

modprobe: ERROR: ../libkmod/libkmod-module.c:838 kmod_module_insert_module() could not find module by name='iwlwifi'
modprobe: ERROR: could not insert 'iwlwifi': Unknown symbol in module, or unknown parameter (see dmesg)

EDIT 2 :

Empty result for sudo dmesg | grep iwl

Result for sudo dkms status : backport-iwlwifi, 8324: added

Result for modinfo iwlwifi | grep filename : modinfo: ERROR: Module iwlwifi not found.