Update and Upgrade LG Phoenix 4 lm x210apm?

I have the phoenix 4 lm x210apm with android 7.1.2
and I do not have android 8.1, it does not update
in the official page of At & t and in the lg it appears that if there is an update but I can not update.

try to install the version of k8 + of android 8.1 but exit dll error in the LGup

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