i have a Letv router, 16MB flash, 128MB RAM, which firmware should i choose.
None, not listed in the ToH := not supported.
That doesn't mean you can't add support for your device (source level changes required), but there are no ready-made 'generic' firmwares you could 'try' to install.
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I have tested openwrt-18.06.1-ar71xx-generic-ap147-010-squashfs-sysupgrade.bin, everything works very well 
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