Hi,
The easiest way to go around the safety block - change your static IP address to any other one. So if your network adapter is set to 192.168.1.100, just manually set it to 192.168.1.101 and you will be able to reach WebUI again.
You can also send SMS with UCI command to do that:
SMS'es should look like this, make sure you send them separately:
admin01 uci delete blocklist.@uhttpd[0].ip='192.168.1.100'
uci commit
luci-reload
Change "admin01" to your current WebUI password and "192.168.1.100" to the IP that the router blocked.
EB.