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In my Clevo Laptop with @novacustom@mastodon.online and @3mdeb@fosstodon.org Coreboot firmware I now have replaced another proprietary part!
The Intel AX200 previously installed waits for a new use case, while I swapped in the Qualcomm Atheros Y8512 pci-e Wifi card, which has #blobfree drivers and thus runs fully on Linux, not just on some #nonfree kernels (that basically break the open source philosophy by including proprietary code in the single most critical root binary on your system)
It works great, just downloaded a Firefox release. zip over wifi without a single stutter!
I am guessing modern wifi features and speeds aren't important to you. Note that using an 802.11n device on a network with ac/ax devices will slow down all other devices traffic
Do you have an alternative blobfree card?
Our router is old and other devices here are too. Thats not a worry for me.
There are no blobless cards newer than wifi 4 afaik, wifi 5+ seem to be complicated enough they need updatable firmwares
OpenWiFi implemented a WiFi 6 (802.11ax) network card with FPGA, and its driver. Currently only available for subscription, but will be open source in future.