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OpenWRT Table Of Hardware contains some info:
https://openwrt.org/toh/nexx/wt3020 -
At DD-WRT forums for uboot, as follows:
Start from stock firmware. Link to stock firmware if already flashed:
https://app.box.com/s/5ksqqy14i8eb8vbcf9almn7h1it8hqi8
Link to breed uboot:
https://breed.hackpascal.net/breed-mt7620-reset1.bin
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Link to a Russian thread covering the same uboot topic:
http://cyber-place.ru/showthread.php?t=1825 -
Link to a hungarian page explaining the same uboot topic:
https://logout.hu/bejegyzes/alyrarkhon/nexx_wt3020_okositas_step-by-step.html -
Link to a page explaining how to flash:
http://snakelab.cc/2014/12/05/howto_flash_openwrt_on_wt3020.html -
Link to pages for external antenna mod:
https://forum.openwrt.org/viewtopic.php?id=57987
and a russian blog post -
On these forums for flash mod:
Nexx WT3020 upgrading flash storage : compilation failed -
Last, it looks like some work may need done for this WT3020 on LEDE:
https://bugs.openwrt.org/index.php?do=details&task_id=557