i have found source for compile pandorabox firmware but wifi problem with DFS channels
i use in fine PandoraBox 18.07
compilation informations:
https://www.haiyun.me/archives/1287.html
sources:
https://downloads.pangubox.com/pandorabox
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i have compiled & removed chinese pages , samba4 ( no many place in flash for add minidlna , luci-app-relayd )