It's on secondary ftp2 server for now, should appear primary soon.
USG20 ftp://ftp2.zyxel.com/ZyWALL_USG_20/firmware/ZyWALL%20USG%2020_3.30(BDQ.4)C0.zip
USG20W ftp://ftp2.zyxel.com/ZYWALL_USG_20W/firmware/ZYWALL%20USG%2020W_3.30(BDR.4)C0.zip
USG50 ftp://ftp2.zyxel.com/ZyWALL_USG_50/firmware/ZyWALL%20USG%2050_3.30(BDS.4)C0.zip
USG100 ftp://ftp2.zyxel.com/ZYWALL_USG_100/firmware/ZYWALL%20USG%20100_3.30(AQQ.4)C0.zip
USG 200 ftp://ftp2.zyxel.com/ZYWALL_USG_200/firmware/ZYWALL%20USG%20200_3.30(AQU.4)C0.zip
USG300 ftp://ftp2.zyxel.com/ZyWALL_USG_300/firmware/ZyWALL%20USG%20300_3.30(AQE.4)C0.zip
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