@msallehi
I tried to follow the instructions and there seems to be some error with the links above (space between /Everything/ and aarch64).
In any case I got to the point where you convert from rpm to deb and it failed. See steps I took.
sudo wget https://download1.rpmfusion.org/nonfree/fedora/development/rawhide/Everything/aarch64/os/Packages/r/r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm
sudo add-apt-repository universe
sudo apt-get install alien
sudo alien r5u87x-firmware-0.2.0-15.a9b2171d762b.fc33.aarch64.rpm
warning: r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm: Header V3 RSA/SHA1 Signature, key ID 94843c65: NOKEY
warning: r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm: Header V3 RSA/SHA1 Signature, key ID 94843c65: NOKEY
warning: r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm: Header V3 RSA/SHA1 Signature, key ID 94843c65: NOKEY
warning: r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm: Header V3 RSA/SHA1 Signature, key ID 94843c65: NOKEY
warning: r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm: Header V3 RSA/SHA1 Signature, key ID 94843c65: NOKEY
warning: r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm: Header V3 RSA/SHA1 Signature, key ID 94843c65: NOKEY
warning: r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm: Header V3 RSA/SHA1 Signature, key ID 94843c65: NOKEY
warning: r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm: Header V3 RSA/SHA1 Signature, key ID 94843c65: NOKEY
warning: r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm: Header V3 RSA/SHA1 Signature, key ID 94843c65: NOKEY
warning: r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm: Header V3 RSA/SHA1 Signature, key ID 94843c65: NOKEY
warning: r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm: Header V3 RSA/SHA1 Signature, key ID 94843c65: NOKEY
warning: r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm: Header V3 RSA/SHA1 Signature, key ID 94843c65: NOKEY
warning: r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm: Header V3 RSA/SHA1 Signature, key ID 94843c65: NOKEY
warning: r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm: Header V3 RSA/SHA1 Signature, key ID 94843c65: NOKEY
warning: r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm: Header V3 RSA/SHA1 Signature, key ID 94843c65: NOKEY
warning: r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm: Header V3 RSA/SHA1 Signature, key ID 94843c65: NOKEY
warning: r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm: Header V3 RSA/SHA1 Signature, key ID 94843c65: NOKEY
r5u87x-firmware-0.2.0-16.a9b2171d762b.fc34.aarch64.rpm is for architecture aarch64 ; the package cannot be built on this system
Now I am stuck. Seems that the Kubuntu version I am using doesn't like it...
any help will be appreciated.