I have installed rocky linux minimul but when i got to start networking it said i device was down so i set it to up state using ip link still no internet so i go to nmtui → radio there it said wifi hardware missing what to do
What WIFI card is it? Provide output of:
lspci -nn
In the past a minimal install has not installed all packages required for wifi.
Check if wpa_supplicant and NetworkManager-wifi packages are at least installed (you may need more).
try
dmesg | grep iwl
see if the firmware is loaded and the device is detected (probably not)
A quick google shows issues with this WiMAX 6250 device around 2010.