Firmware downgrade to older versions (11.01 or 11.02) is not possible, due to the unsigned firmware update files.
The following clients and features are not supported anymore:
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Caradigm
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Citrix Legacy Sessions
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Citrix Web Interface
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Citrix StoreFront Legacy
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Citrix HDX Flash Redirection
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Citrix XenDesktop Appliance Mode
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Flash Player Download
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JAVA Web Start
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Leostream Java Connect
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Systancia AppliDis
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VIA graphics driver