First of all, the version of the router is 4A Giga Version R4A. There are metal coolers on the processor and components in the product. How can I install openwrt on this model, the classic version is not very good, I have zero knowledge about this subject, so please try to explain accordingly.
Start by reading the official wiki and identifying your version. Then, return with any specific questions you might have.
e.g., there is no OpenWrt support for the v3 (aka RD05) on the Realtek SoC.
If you have a v1 or v2 on MediaTek SoC, follow the OpenWrt install guide here:
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