Can i go back to cm11s this way?

Hi! My question is lame, i know.. But here it goes anyway, i couldn't find a simple and direct answer..
Is less than a week that i have this phone, and i've been reading a lot of guides of how to rollback to cm11s.. the thing is i've flashed the latest CM12S signed zip ota through CM Recovery, everything is fine as i'm testing it right now..
My question is: if i want to go back to CM11S (in the case that i don't like CM12S or have some bugs), can i just wipe data / factory reset and cache in CM Recovery, and then flash the cm11s signed zip?
I haven't rooted or unlocked bootloader, is it relatively easy from what i read around here.. but i wondered if i had to go through all those steps (unlock bootloader, custom recovery, and then flash) or just doing the steps mentioned before will work just fine..
Is it better to fastboot flash or through custom recovery is fine also?

Thanks in advance!

PD: I'm also asking what do you think about some other 5.1.1 Lollipop ROM, custom kernel, etc.. I'm kind of a flashaholic and i would be able to install the custom recovery if would be really worth it :D
PD2: sorry for the bad english, i'm from argentina

No Signal [CM11S - 25R]

trying my luck here again..

hey guys, i've downgraded from CM11S 38R to 25R, but i don't have signal...
it's doesn't recognize my cellular network and yes the sim is in the right direction because i didn't had signal only after i've downgraded.
any suggestions?
heard it has something to do with modem.. tried to flash 44S modem/33R modem and nothing

Phone bootlooping if i update to CM12, working with CM11S and ColorOS

Hi everyone, i've got my OPO when CM12 still wasn't a thing, and it always did his job wonderfully, i've updated to CM12 when it first came out, then updated it every time a new stable version was out, YNG1TAS2I3 version included (with root access and TWRP). A few days ago, while i was listening to some music with Google Play Music, the phone started to reboot itself for no apparent reason, and after around 10 reboots with random timings, i found out there was a problem with google play services, so i blocked them with Titanium Backup, deleted updates, updated them again, reactivated, and everything went fine.

Yesterday, my phone once again rebooted by itself, but every time it was rebooting, while showing the boot logo, it rebooted again without actually loading android. I first tried to wipe cache, then dalvik cache, then data and system partitions, factory reset, but it kept rebooting no matter what, until i tried to flash CM11S on it. After a few tries and total wipes, CM11S was running with no reboots, and it worked flawlessly, no root, no custom recovery, everything stock flashed from official fastboot images zip.

After that, i tried to update via OTA to the more recent versions of CM11S, no problems so far, but as soon as i updated to CM12 via OTA once again, the phone started to reboot itself after the update, it says "Upgrading Android" like when you wipe the dalvik-cache, and then it freezes for a second, then reboots.

Things i've tried so far:

• full wipe and factory reset from TWRP


• erase and flash again all partitions


• erase and flash again persist partition


• flash colorOS and then flash CM12

After flashing the persist partition it managed to work for a minute on CM12, but then it started rebooting itself again, and i've managed to save the last part of logat log , but i'm not sure if it's worth anything to find out the problem! (i can't post it on forum because of the new user link restriction, but if you want to have a look at it, let me know)

So, basically, my phone works only on android 4.x and not on 5.x, I would think some app on it can make it crash, but even after a full wipe it still behaves like this, what could be the reason and how can i try to fix it? thanks in advice!