TP-LINK 740v4 Openwrt
Download from gdrive Snapshot version Revision r14194-18ab496c32
and the v19.07.3 release
A newer snapshot version is available, the newer ath79 with the newest kernel 5.4.x but without luci (not possible) For this version upgrade without keep the configuration, but you can restore the old configuration later via ssh.
WARNING: Do not attempt to preserve settings when upgrading from the snapshot > release. The snapshot are newer than the release.
I'm not responsible for any damage to your device of any sort.
By flashing this you take responsibility of anything that happens.
Process at your own risk!
This is the unofficial version from the source version 19.x
I use this firmware instead a switch for a TV and some other small device.
But if you have any mind use the official 18. I don't give any support.
I don't have any issues with my compiled firmware
But remember that you don't have enough space for install anything else