Install a smaller version for Mi 4c

I installed the latest version on mi 4c, but there is 6 kilobytes of space left and there is no place to install software. Which version should I install to save more space?

Xiaomi Mi Router 4C
MediaTek MT7628AN ver:1 eco:2
OpenWrt 22.03.5 r20134-5f15225c1e / LuCI openwrt-22.03 branch git-23.093.57104-ce20b4a

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