Since stock OpenWrt will not run, here are three practical paths:

The RTL8196E is a MIPS-based SoC from Realtek commonly used in low-cost routers and embedded network devices. Running OpenWrt on RTL8196E-based hardware can provide a more flexible, secure, and up-to-date router firmware than vendor-provided images, but support is limited compared with more popular SoCs. This guide covers hardware background, OpenWrt compatibility, obtaining and building firmware, installation methods, common issues, and tips for development and recovery.

git clone https://github.com/openwrt-rtl/rtl8196e-patches.git target/linux/ramips/patches-5.4/

The RTL8196E is typically paired with very limited resources, which presents significant hurdles for modern firmware: Topic: Realtek SoC support in OpenWrt