you need to modify dts of 841v8 to 16mb flash https://github.com/openwrt/openwrt/blob/1722e23ffcf9038114142a2129c29eb3cdec8ff9/target/linux/ath79/dts/ar9341_tplink_tl-wr841-v8.dts#L55 and recompile openwrt
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