Here's how we parse the user agent:
Mozilla/5.0 (Linux; U; Android 4.1.1; en-us; Huawei Y301A1 Build/HuaweiY301A1) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30

Android Browser 4 on Android (Jelly Bean)
Huawei
Here's detailed information about what we can parse:
Simplified readout
Clear, human readable descriptions of the software & platform
Software
Information about the web software
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Software
Android Browser 4
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Software Name
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Software Name Code
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Software Version
4
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Software Version (full)
4.0
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Layout Engine Name
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Layout Engine Version
534.30
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Software Type
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Hardware Type
Operating System
Information about the Operating System
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Operating System
Android (Jelly Bean)
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Operating System Name
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Operating System Name Code
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Operating System Flavour
---
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Operating System Version
Jelly Bean
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Operating System Version (full)
4.1.1
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Operating System Frameworks
---
Misc
Miscellaneous Information
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Operating Platform
---
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Operating Platform Code
---