Wavlink WN530HG4 M30HG4.V5030.191116 was discovered to contain a hardcoded encryption/decryption key for its configuration files at /etc_ro/lighttpd/www/cgi-bin/ExportAllSettings.sh.
https://drive.google.com/file/d/1s5uZGC_iSzfCJt9BJ8h-P24vmsrmttrf/view?usp=sharing