I finally got my RN2 from G5 after 3days of waiting!

Here's my review:
1. Camera's quality is very similar to Redmi Note, can't see much improvements in terms of the night shots. But the auto focus is pretty snappy.
2. Processor is extremely fast, no lagging at all.
3. Battery life is under average I would say, compared to redmi note. I'm on V7.0.8.
4. Screen is fabulous. Watching HD videos on youtube is a joy, speaker is loud and clear too.
5. A full charge from <10% to 100% takes 2 hours.

Hi, I have some questions to ask. Mine is on V7.0.8

1. What is the easiest way to root this phone without going through PC, for simplicity sake? I tried the twrp287.zip of the Method 2 in the miui forum, but it states that "signature verification failed" when I tried to install it from Mi Updater.

2. Is the font on 7.1.1 the same as 7.0.8? I heard that the font cannot be changed, but if its giving the same font as 7.0.8, then I don't mind upgrading, since I won't change my font anyway. Can someone on 7.1.1 post a screenshot of their font here for comparison?

3. If I have rooted my phone, do I need to unroot it first before performing OTA update or a reformatting, or it's fine to do that while my phone is rooted?