same but I think It shouldn't be the issue

I have 6 /128 variant and it's usage is around 3.7-3.8 gb used mostly And about One ui 8.5 Update I am loving it although it's my mother's phone .

good lock is not supported in M ,F series phones it is supported in A 30 series and a50 series and S series but you can use fine lock from playstore. And about software update m35 will get till one ui 10.