how to update Samsung Google Android jelly bean?

[shehryaar]

how do you update a Android jelly bean phone? it is the oldest version of it still it's telling that your device is up to date

[sgrkoirala]

lol buy a new phone

[shehryaar]

but they don't exist

[shehryaar]

info

[shehryaar]

pictures Nusxus s

[shehryaar]

it lags too much

[shehryaar]

Please answer:(