The latest software for the LG K20 AT&T is software version M25520g.
To check what version of software is installed on your LG G5:
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Open Settings
> General tab > About phone
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Tap Software information.
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View the current software under Software version.
Select software for more info:
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Software version M25520g - Release date September, 2019
- August Security Update (2019-09-10)
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Software version M25520f - Release date April, 2019
- Android Security Update (2019-04-01)
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Software version M25520e - Release date February, 2019
- Android Security Update (2019-02-01)
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Software version M25520d - Release date December, 2018
- Android Security Update (2018-11-01)
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Software version M25520c - Release date November, 2018
- Android Security Update (2018-10-01)
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Software version M25520b - Release date October, 2018
- Android O OS Upgrade
- Android Security Update (2018-08-01)
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Software version M25510u - Release date August, 2018
- Security Maintenance Release
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Software version M25510s - Release date May, 2018
- Android Security Update (2018-04-01)
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Software version M25510r - Release date March, 2018
- Android Security Update (2018-02-01)
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Software version M25510q - Release date January, 2018
- Security Maintenance Release
- Wi-Fi KRACK patch
- Android Security Update (2017-12-01) including BlueBorne fix (on SPLs September 1 or later)
References (as needed):
AT&T Support: https://www.att.com/devicehowto/tutorial.html#!/stepbystep/id/stepbystep_KM1223464?make=LG&model=LGM255