V20f is JB and is the KDZ most, if not all MetroPCS phones were on since this year. Now, if it's asking you to update to V20h, I heard it breaks root for some people so I'd say no. The KDZ above is V20f which is T-Mobile. The updates work whether you're T-Mobile or MetroPCS though.
“Take heed, and be on your guard against all covetousness,
for one’s life does not consist in the abundance of his possessions.”