If Wi-Fi works, stay on the older kernel until a patch is released. Summary Checklist Check dmesg for the exact missing filename. Reinstall the linux-firmware package. Ensure Secure Boot isn't blocking the driver. Manually place missing .ucode files in /lib/firmware/ .
I can give you more specific commands to check if the card is active or find the right firmware package. iwlwifi firmware failed to load iwldebugyoyobin exclusive
Locate the specific .ucode filename matching the one noted from your dmesg logs in Step 1. If Wi-Fi works, stay on the older kernel