How do I downgrade to stock Marshmallow? - Nexus 6P Q&A, Help & Troubleshooting

I have 8.1.0 rooted and I'd like to go back as far as I can go without root without twrp, everything stock if possible.
I've seen this section 10: https://forum.xda-developers.com/t/guide-unlock-root-flash-for-nexus-6p.3206928/
But I'm not sure which is the correct 'version'. For example:
6.0.0 (MDA89D)
6.0.0 (MDB08K)
6.0.0 (MDB08L)
6.0.0 (MDB08M)
6.0.0 (MMB29N)
6.0.1 (MMB29M)
6.0.1 (MMB29P)
6.0.1 (MMB29Q)
6.0.1 (MMB29V)
6.0.1 (MHC19I)
6.0.1 (MHC19Q)
6.0.1 (MTC19T)
6.0.1 (MTC19V)
6.0.1 (MTC19X)
6.0.1 (MTC20F)
6.0.1 (MTC20L)
Are those for different devices (depending on carrier/region) or are those small updates between versions?
Also, Google claims OTA is easier and safer than Factory Images as in the above link.
Does it matter which is used?

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Downgrade to 5.1.1 ? [A510F]

Hello.
Is there a way to downgrade my 6.0.1 Galaxy A5 2016 to Lollipop 5.1.1 ? I know the steps but I couldnt be sure that flashing 5.1.1 firmware directly from Odin will be okay.
Downgrade from stock 6.0.1 to stock 5.1.1 with Odin isn't possible.
"Kad piješ umjereno mo'š pit' kol'ko 'oćeš" by Izet

N910f Downgrade 6.0.1 to 5.1.1

Recently I updated Note 4 N910f to 6.0.1 but Now I want to downgrad from 6.0.1 to 5.1.1
faijanpatel said:
Recently I updated Note 4 N910f to 6.0.1 but Now I want to downgrad from 6.0.1 to 5.1.1
Click to expand...
Click to collapse
Download the latest 5.1.1 Stock Firmware for your device from SamMobile website. Always download any unbranded Firmware. And Flash through latest version of Odin ( Follow the instructions).

Which image do i download for canadian varient.

Im using the Canadian version of the 6p and want to downgrade back to 7.0 and or 6.0.1. There are 4 or 5 different ones listed. Im currently on NPF10C.
There is no Canadian version. Use 6.0.1 MTC20L or 7.0 NBD90X. Those are the latest available.
https://developers.google.com/android/images
Can i just flash that over 7.1.1 and not loose data?
If you don't flash userdata.img
I would not recommend dirty flashing.
Backup your stuff, and clean flash when switching major versions (ie. 7.1.1 to 6.0.1, etc.)

J510FQ update 7.1.1 back to 6.0 help ?

J510FQ update came. Official stock 7.1.1 I am using firmware, I would like to return to firmware 6.0 How do I do with my odin?

stock 5.1.1 (lollipop) modem/radio image for c50n/h340n ?

Could someone provide 5.1.1 modem for c50n/h340n?
I have installed XenonHD but the baseband I have is mpss.dpm.2.0.c11-00061-m8936faaaanuzm-1 (Marshmallow 6.0) causes the some problems with calling. See post 1 and post 2..

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