BiGuard S20 3.26 firmware
You can download the firmware from this link:
http://www.billion.uk.com/firmware/biguard/BGS20/BGS20_3.26.zip [1]
Links:
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[1] http://www.billion.uk.com/firmware/biguard/BGS20/BGS20_3.26.zip
BiGuard S20 firmware version 3.24v - 13.8 MB.