Format or wipe in TWRP with stock rom for factory reset?

[wonder_skydive]

Hi,
Fist time, my apologies if this doubt or question is "stupid"...
I'm new in twrp...
I want use the stock rom, Iwas installed TWRP , root the device, change some files for VoLTE and all works fine.
But I want made a full factory reset (also for calibrate battery).
I was go to TWRP and presh Wipe (no advanced wipe), this made a reset but I view that aren't full factory reset (some files continue in internal storage...etc...).

I view that, are a Format option in TWRP-Wipe-Advanced options, if use format, format my rom? I question this because, also, I want decrypt my phone, and after read in google and some posts I view some posts with the option for format, but like indicate, I want use my stock rom of HTC u11 but I'm not sure if format delete my o.s./rom and then need install stock rom.

If the format option isn't for decrypt and factory reset, are wipe, wipe data, cache and davilk cache, options for full factory reset?

Again, sorry if this question is...rookie question...I search in google, in this forum, but I don't view exact how made and I have very afraid of doing it wrong.

Thanks and regards.

PS: Sorry my english

 

[wonder_skydive]

Auto reply:
First, format data.
Then, advanced options in wipe, check Dalvik / ART Cache, Cache and Data, then wipe.
With this, hard reset.

The first time I made the wipe with not format data, not made wipe for decryption, for this reasson, first we need format data, then, we can check this options and wipe works fine.

Regards.