Here;
https://forum.qnap.net.pl/temat/stable-qts-4-1-4-build-0910-arm-x86.7759/print
[Download]
http://download.qnap.com/Storage/SS-439ProTurboNAS/SS-439_20150910-4.1.4.zip
http://download.qnap.com/Storage/SS-839ProTurboNAS/SS-839_20150910-4.1.4.zip
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http://download.qnap.com/Storage/TS-210TurboNAS/TS-210_20150910-4.1.4.zip
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http://download.qnap.com/Storage/TS-869ProTurboNAS/TS-869_20150910-4.1.4.zip
http://download.qnap.com/Storage/TS-869U-RP/TS-869U_20150910-4.1.4.zip
http://download.qnap.com/Storage/TS-870U-RP/TS-870U_20150910-4.1.4.zip
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http://download.qnap.com/Storage/SS-EC1279U-SAS-RP/SS-1279U_20150910-4.1.4.zip
http://download.qnap.com/Storage/SS-EC1879U-SAS-RP/SS-1879U_20150910-4.1.4.zip
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http://download.qnap.com/Storage/TS-269HTurboNAS/TS-269H_20150910-4.1.4.zip
http://download.qnap.com/Storage/HS-210TurboNAS/HS-210_20150910-4.1.4.zip
http://download.qnap.com/Storage/IS-400/IS-400_20150910-4.1.4.zip
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http://download.qnap.com/Storage/HS-251/HS-251_20150910-4.1.4.zip
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http://download.qnap.com/Storage/TVS-X71U/TVS-X71U_20150910-4.1.4.zip
http://download.qnap.com/Storage/TS-X31+/TS-X31+_20150910-4.1.4.zip