Firmware availability for AX5200 (RAX48) nighthawk router

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Firmware availability for AX5200 (RAX48) nighthawk router

I have a nighthawk AX5200 (RAX48) router and would like to flash it with a custom firmware.  The stock firmware is designed for convenience over security for the home users.  However I can't seem to find a custom firmware for this model.  Can someone tell me what custom firmware I can use and where I can download?  Thanks