Downgrading from M to L - Nexus 6 Q&A, Help & Troubleshooting

As the name of thread suggest I purchased a nexus 6 and it came with 6.0.1 I want to downgrade it to 5.1.1 do I need to unlock bootloader or what's the procedure?its my first nexus device so I need little help

Download a Lollipop factory image and follow the instructions in this thread, and yes you do need to unlock the bootloader.
http://forum.xda-developers.com/nexus-6/general/guide-flash-factory-images-nexus-6shamu-t2954008

Just out of curiosity, while everybody else is asking about how to upgrade their N6, you're wanting to downgrade. Why?

The device is backwards compatible. Why you'd want to downgrade is curious though. My favorite version is still Jellybean, then Marshmallow. I think Lollipop was horrible

Ok i am on mmb29s i thought this one is developer preview and not stable Can anyone tell me whether its stable or not or give a quick review about firmware and does the toggling of the oem unlock option locks the bootloader again?

Is the MMB29s more stable than lmy48y

The factory images from Google are always stable releases. The version you have is therefore a stable release.
Toggling OEM Unlock will not lock the bootloader. To lock the bootloader you need Fastboot.

Why would you want to toggle OEM unlock back to off?
Why would you want to downgrade to LP? MM is basically LP with the bugs worked out, and an extra hour or so of battery life.
If your only on the dev preview... why not upgrade to most recent instead of to an old version if your looking for more stability?

My advice is, don't downgrade. The latest android version is the one you are using, and it works without problems, and Marshmallow gives you a feeling of having an extra battery compared to Lollypop.

As others have already answered, totally stable, with better battery life probably because of Doze.

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Related

Need help for XT1052 (Moto X 1st gen)

Hi everyone,
I'm using XT1052 (Moto X 1st gen). I'd briefly explain my problem here hoping to get some help. I was using stock Android 4.4.4 which I rooted and installed CM12.1 a month ago. Then when Motorola started soak test, I switched back to stock using RSD Lite and installed soak test OTA which was draining battery heavily so I decided to go back to CM12.1 which I did after a couple of days. Now I'm running CM12.1 but when I try to flash stock Android 4.4.4 using RSD Lite it won't let me do that and giving me the error. I think the soak test did all this.
Is there a way to go back to stock 4.4.4 with the current bootloader?
Can anyone suggest a way out?
No you have to downgrade the bootloader which can be done and there is threads about how to do it, but youre taking a risk of bricking doing thus but it can be safe if done to 100% Right. You're right it was the soak test because it also updated your bootloader to lollipop. Too bad, I waited for a developer to release a official lollipop with a kit kat bootloader so I can easily flash back to kit kat. Let me guess your battery drain was cell standby? I have same problem, but if you turn off carrier internet, it goes away and you actually get better battery life. But if you need cell internet always on, kit kat is best option and you will have to do the risky flash and downgrade the bootloader. If your interested in the lollipop rom that doesn't update the bootloader, it's for the xt1053 model.
BrownDog99 said:
No you have to downgrade the bootloader which can be done and there is threads about how to do it, but youre taking a risk of bricking doing thus but it can be safe if done to 100% Right. You're right it was the soak test because it also updated your bootloader to lollipop. Too bad, I waited for a developer to release a official lollipop with a kit kat bootloader so I can easily flash back to kit kat. Let me guess your battery drain was cell standby? I have same problem, but if you turn off carrier internet, it goes away and you actually get better battery life. But if you need cell internet always on, kit kat is best option and you will have to do the risky flash and downgrade the bootloader. If your interested in the lollipop rom that doesn't update the bootloader, it's for the xt1053 model.
Click to expand...
Click to collapse
Thank you for your reply. Can you give me any link to that thread which contains info. on how can I downgrade my bootloader?
I most of the times use WiFi but when I'm out I use 3g but that's not always on. Once sync has been done, I usually turn it off.
Basically I want to go back to stock 4.4.4 and then be able to install official 5.1. I don't mind bricking my device as my moto is almost 2 years old and soon 3rd gen will be out. If something goes wrong I'll buy a 3rd gen. For now I have a standby basic phone.
Here's the link but why don't you just flash the stock lollipop from the soak test? Why even worry about the downgrade if you want lollipop anyways? http://forum.xda-developers.com/showthread.php?t=3058202
BrownDog99 said:
Here's the link but why don't you just flash the stock lollipop from the soak test? Why even worry about the downgrade if you want lollipop anyways? http://forum.xda-developers.com/showthread.php?t=3058202
Click to expand...
Click to collapse
I want that but basically I don't know where to get the stock lollipop from soak test? I read somewhere that soak test ota zip is not the complete version. It must be installed on the original 4.4.4 ROM. Can you guide me how do I get back to stock and where will I get that soak test file and shall I flash it using RSD Lite? Please reply as I am free this evening and quick response will be really appreciated.

Nexus 6 5.1 Bootloader

When I first got the N6 in June I immediately unlocked the bootloader and flashed CyanogenMod 12. Now I remember reading beforehand that if you updated your device to 5.1 via the factory images or OTA, that the bootloader cannot be downgraded anymore. I made sure to not do this so my N6 is on the very first bootloader still and I haven't had any issues.
Now, I feel like I read that there was a reason to want to downgrade and a reason for not wanting this new bootloader but I can no longer find any information on this whole topic, other than people saying yo ucannot downgrade.
I'm asking if there are potentially issues if I do update or if it's ok to stay on my current old bootloader when I update to 6.0 soon?
admiralspeedy said:
When I first got the N6 in June I immediately unlocked the bootloader and flashed CyanogenMod 12. Now I remember reading beforehand that if you updated your device to 5.1 via the factory images or OTA, that the bootloader cannot be downgraded anymore. I made sure to not do this so my N6 is on the very first bootloader still and I haven't had any issues.
Now, I feel like I read that there was a reason to want to downgrade and a reason for not wanting this new bootloader but I can no longer find any information on this whole topic, other than people saying yo ucannot downgrade.
I'm asking if there are potentially issues if I do update or if it's ok to stay on my current old bootloader when I update to 6.0 soon?
Click to expand...
Click to collapse
You couldn't downgrade from a 5.1 bootloader to a 5.0 bootloader, because the 5.1 bootloader brought some new security features in. I don't know of any reason why you would want to downgrade the bootloader.
There is no reason to not upgrade it either, though as far as I am aware, 6.0 will work with a 5.1 BL, just don't think it will work with a 5.0 one.
I see, thank you!

A few Questions from a Noobie

Hi, im new to Note 5 Dev. and been out of the loop since it was released. i had a Sony Xperia play and a Galaxy s3 before and know how to do the basic stuff to do custom roms and flash stuff etc. to those Phones. But a Note 5 is different, running on Lollipop, having EFS partition stuff and OEM unlock Stuff. i just want to ask a few questions to make sure i don't do something stupid (i already did some of the research for answers on some of this for a few days now and some are Informative and Awesome, but a little outdated) so tnx in advance kind People :fingers-crossed:
My Device: SM-N920C (UAE)
Android Ver: 5.1.1 (Lollipop) Stock
Questions:
1.) Can i Revert back to 5.1.1 (lollipop) stock/ [Downgrade] , IF i decided to update to Nougat Stock?? (just curious ) and if yes, can you kindly link me to a process? if not, then that's fine too :laugh:
2.) Do you have to Enable OEM unlock if Updating Stock (in my case Nougat)??
I red somewhere on Magisk thread here on XDA that it can Grant Root Access to 5.0+ . If so, installing TWRP and Flashing Magisk on 5.1.1 involves Enabling USB Debugging and OEM Unlock.
3.) Do i have to Enable OEM Unlock Forever now? cause i saw some threads says that if you disable it, you will have a bootloop or a soft brick and will have to Flash Stock again and repeat. (don't really have a problem with it being Enabled, but the other people in Tutorials , Vid. Tutorials and Thread Posts just mentions "Enable it". And never really says after the process is done u can Disable it and stuff.), just want to have that information, cause i Understand that OEM is a LOCK that Even if someone steals your phone and has a lock in it. they can't just Flash a Stock Rom on it to Unlock it. [great feature] :fingers-crossed:
4.) if i have a Custom Recovery and Rooted my phone ver. 5.1.1 successfully, can i still Unroot it and go back to Stock 5.1.1?? also applies to other Versions of android. EX. nougat Stock then i root it, will i still unroot it and go back to stock?
5.) Do you need to be in a Specific Version of android to use the Custom Roms?? i mean i'm in android 5.1.1 [if rooted], can i flash a Nougat Custom Rom or a s8 port etc.?? or do i need to be in Stock Nougat > Root it > then flash Custom Nougat Roms?
That is all, Sorry if all the Questions are Freakin Long Shahaha, i just want to be specific so all the people who are also newbies can understand the questions and have answers. Tnx again for the people who have the patience to read and answer these questions. :highfive:
shadowhog006 said:
Hi, im new to Note 5 Dev. and been out of the loop since it was released. i had a Sony Xperia play and a Galaxy s3 before and know how to do the basic stuff to do custom roms and flash stuff etc. to those Phones. But a Note 5 is different, running on Lollipop, having EFS partition stuff and OEM unlock Stuff. i just want to ask a few questions to make sure i don't do something stupid (i already did some of the research for answers on some of this for a few days now and some are Informative and Awesome, but a little outdated) so tnx in advance kind People :fingers-crossed:
My Device: SM-N920C (UAE)
Android Ver: 5.1.1 (Lollipop) Stock
Questions:
1.) Can i Revert back to 5.1.1 (lollipop) stock/ [Downgrade] , IF i decided to update to Nougat Stock?? (just curious ) and if yes, can you kindly link me to a process? if not, then that's fine too :laugh:
2.) Do you have to Enable OEM unlock if Updating Stock (in my case Nougat)??
I red somewhere on Magisk thread here on XDA that it can Grant Root Access to 5.0+ . If so, installing TWRP and Flashing Magisk on 5.1.1 involves Enabling USB Debugging and OEM Unlock.
3.) Do i have to Enable OEM Unlock Forever now? cause i saw some threads says that if you disable it, you will have a bootloop or a soft brick and will have to Flash Stock again and repeat. (don't really have a problem with it being Enabled, but the other people in Tutorials , Vid. Tutorials and Thread Posts just mentions "Enable it". And never really says after the process is done u can Disable it and stuff.), just want to have that information, cause i Understand that OEM is a LOCK that Even if someone steals your phone and has a lock in it. they can't just Flash a Stock Rom on it to Unlock it. [great feature] :fingers-crossed:
4.) if i have a Custom Recovery and Rooted my phone ver. 5.1.1 successfully, can i still Unroot it and go back to Stock 5.1.1?? also applies to other Versions of android. EX. nougat Stock then i root it, will i still unroot it and go back to stock?
5.) Do you need to be in a Specific Version of android to use the Custom Roms?? i mean i'm in android 5.1.1 [if rooted], can i flash a Nougat Custom Rom or a s8 port etc.?? or do i need to be in Stock Nougat > Root it > then flash Custom Nougat Roms?
That is all, Sorry if all the Questions are Freakin Long Shahaha, i just want to be specific so all the people who are also newbies can understand the questions and have answers. Tnx again for the people who have the patience to read and answer these questions. :highfive:
Click to expand...
Click to collapse
1)If you flash stock 7.0 on your device if available then its hard to revert to back to stock 5.1.1 as there is thread in Question&Answers section about downgrading from 6.0.1 to 5.1.1 but many are unsuccessful(I have successfully downgraded from 7.0 to 6.0.1 but Cant confirm about 5.1.1 as google has changed many security policies in updates versions like 6.0.1 or 7.0 which will block your bootloader to downgrade easily/Issue you will face like lossing of baseband or corrupt imei which will block you from receiving network signal)
2)Yes its very important to enable Oem unlock and usb debugging while flashing any stock firmware using odin to avoid DM-Verity/SW Check Fail/Custom Binary blocked by FRP like issues which are hard to solve enough OR you will might hard brick your device which will be difficult to make it live again( AFAIK to flash TWRP or Any root access using odin there is instruction to enable Oem Unlock before flashing always remember it as a essential step before flashing anything using odin)
3)Yes once you enable Oem unlock for purpose of modification of your device, it needs to be unlocked or even its enabled by default to overcome reported issue like infinite bootloop or Many i mentioned in my 2nd Post And Oem unlock allows your bootloader to be customised by flashing mods or roms which is by default locked so that you could not easily modify your device as well as to avoid further modification issues
4)If you choose to stay at 5.1.1 and rooted your device with installed TWRP then yes you can unroot it by flashing 5.1.1 using odin( In case your on 6.0.1 or Even on 7.0 you can unroot your device with the same process but here to remind you that you need to flash stock 6.0.1 or 7.0 respectively version on which you rooted your device So if you will try to unroot it by flashing 5.1.1 again while your on 7.0 rooted device then again here downgrade issue which will probably give you mentioned error as a result)
5)To use custom nougat based roms or any S8+ port based on 7.0 you should atleast upgrade your bootloader and modem to 6.0.1( If your rooted on 5.1.1 and try installing nougat roms then your device will not boot as your using old bootloader, so upgrade bootloader or modem either to 6.0.1 or you can update whole system to 7.0>root>install TWRP>flash custom nougat based roms or s8+ ports afterall choice is your as if you want to upgrade only BL and Modem to 6.0.1 or want to upgrade system with BL and Modem to 7.0, i will mention here is BL and Modem for 7.0 are also available to flash you can find those on dr.ketan rom n10 installation instruction section in Samsung galaxy note 5>Android development>Dr.ketan Rom N10 instead of whole system update but Flashing Stock full firmware is always recommended for good reception and avoid glitches)
I think i have tried to fulfil all of your queries as far possible by myself
Regards,
AssassinCreed-Xda Developers
Too bad about the answer to the 3rd question, that feature would've been nice to have. but oh well. shahahaha
~Ooh!! i have a follow up question regarding your Answer to the 4th question. Can i also flash other Countries Stock firmware?? for example: mine is Stock 5.1.1 [UAE] can i flash Stock 5.1.1 [USA] or other Country variants?? [of course unlocked bootloader] , i searched again here for people who did that and for some reason they encounter Errors and Unable to revert back to their Original Stock Firmwares.
@AssassinCreed Thank you. yup, clear cut answers. Thank you!! :victory: :victory:

How to update motorola moto x 2nd gen?

Hey Guys! I write to know that how can I update my moto x 2nd gen. from lollipop to marshmallow without opening its bootloader or root because I think these two options are not safe and somehow will damage my device. By the way its a verizon variant xt1096. So guys please help me, will be very grateful
Sapper Morton said:
You could update to MM without unlocking the bootloader, unfortunately the XT1096 ( Verizon ) didn't ever received the Stock MM Firmware, so no lucky to you mate.
Flashing Stock firmware from other variants with locked bootloader could become a nightmare very quickly, so I don't recommend doing that.
If you want a phone that is more or less secure, you better be staying on locked state on Lollipop.
Unlocked bootloader + partition encryption is a reasonable security measure for smartphones, but yet is vulnerable to injection of custom binaries due to the unlocked state.
On daily use, you will hardly ever be vulnerable, however you could be exploited if you become a specific target.
Other than that I recommend buying a new phone that supports security updates officially, for a least to the next 2-3 years.
You know your daily life and your priorities, you can decide for yourself.
Click to expand...
Click to collapse
Thanks for the advice! I really appreciate your thoughts. Well you said that I can update to marshmallow by flashing other variants firmware without opening my device's bootloader. So how can really do that? By the way I have already tried updating through recovery mode, but it didn't work. So is there any other way to update my device.
I have the Verizon model too, and same situation. Phone still works fine, but I couldn't tolerate being 4 major Android versions behind. Eventually, I bite the bullet, unlocked the boot loader (since device is well out of warranty anyway), flashed a Oreo-based Linage OS ROM, which really brought new life into the phone. Some minor issues here and there but nothing huge. You should be okay if you know what you're doing and backup your stock configuration properly.
Sapper Morton said:
You could flash other variants firmware, however the stock MM doesn't support CDMA, only GSM.
With locked bootloader you will only get your XT1096 to work on non-verizon carriers, or partially work on verizon, since they don't use CDMA exclusively anymore.
There was a modded stock MM OS in the past, made to work on verizon network, unfortunately, you need an unlocked bootloader to flash it.
In case you should consider unlocking your bootloader, I recommend flashing the LineageOS 14.1, Android 7.1.2.
Any AOSP ROM, based on CM13, Android 6.0.1, should support CDMA and GSM from the source.
In which case, the Lineage 14.1 supports it, and it has the latest security patches, as I said before, using /data encryption on a unlocked state, is a reasonable security measure you should consider, that way, anyone that may get hands on your device will be unable to read the data, being naive.
Click to expand...
Click to collapse
Thanks once again for your time! Actually I am not on CDMA, I'm using GSM network. So how can update to marshmallow now and I prefer stock marshmallow rather than custom or any other roms. So please guide me in that.

How to downgrade from BTA8 (or how to bypass Bootloader protection)?

Hello people,
I need your help.
I've made greatest mistake of my life by updating ROM of my Samsung S10+ Exynos to this Android 10 ROM: sammobile.com/samsung/galaxy-s10-plus/firmware/SM-G975F/ILO/download/G975FXXU4BTA8/316086/
Now, I need to downgrade to 9.0, because all intent features are "secured" (or just broken) on 10.0 and don't work as they did at 9.0. And, because G975FXXU4BTA8 uses Bootloader 4, I can't downgrade to previous ROMs that use Bootloader 3 and lesser.
I will be happy with any instruction or solution that will allow me to bypass Bootloader protection, or that will allow me to patch previous ROMs to use Bootloader 4 instead of 3 to successfully downgrade, no matter how difficult and complex they are.
Actually, I don't care about downgrade, as long as I can use all intent features in Android 10.0 as I could in Android 9.0, but I don't see any solution so far.
Any advice is welcome,
Thanks!
Since you're on bootloader 4, I don't think you can go back at all as there isn't a work around as far as I know.
StoneyJSG said:
Since you're on bootloader 4, I don't think you can go back at all as there isn't a work around as far as I know.
Click to expand...
Click to collapse
Aren't there any custom ROMs in existence that allow to install Android 9.0 over Bootloader 4 as if nothing happened?
There might be, you would have to check the forums here. I have a snapdragon model, so no root or custom ROMs for me.

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