Bricked, Unbricked, how to update? - Moto X Q&A

So I was on 4.4.2 before and rooted and wanted to update and followed an old guide which led me to an old link to the toolkit. The result was downgrading to 4.2.2, OTAing, and then bricking. It took me awhile but somehow I flashed the 4.2.2 again and managed to unbrick myself. Now that I can access my phone again how do I update to the newest 4.4.4 without bricking again? I'm a bit afraid of doing anything at this point. Is it possible to just flash a custom rom to avoid it (I'm on developer edition)? Is it safe to RSDlite to 4.4.4 using the right carrier?

edit:
nevermind... I turned the phone off to check the status of the bootloader and saw it was unlocked, did a normal power up. For some reason it said android is updating even though I didn't do any updates and it randomly turned off and now it's completely dead .

Same problem
nvertigo said:
edit:
nevermind... I turned the phone off to check the status of the bootloader and saw it was unlocked, did a normal power up. For some reason it said android is updating even though I didn't do any updates and it randomly turned off and now it's completely dead .
Click to expand...
Click to collapse
My girlfriends phone has the same issue. It received an OTA update on Friday and kept havin problems running programs and rebooting. This morning it was off and when it booted, it couldn't get past the "unlocked bootloader" warning. I could get to the recovery menu but could not run TwRP because it froze at the splash.
I have tried installing a new recovery via faastboot but after it "installs" , it still appears to be the old recovery.

If you can boot the phone to FastbootAP/Bootloader, check the bootloader version on your phone, and get the corresponding SBF version or NEWER.
Example:
30.70 = original 4.2.2
30.71 = 4.2.2 OTA with camera update
xx.xx = 4.4 <-- I forgot the bootloader version.
30.B4 = 4.4.2
30.B7 = 4.4.4
using an OLDER version SBF will fail at GPT.BIN and Motoboot.img, or will brick your phone!!!
Flash the SBF by following option 5 at -> http://mark.cdmaforums.com/MotoX-ReturnToStock.html
Doing this (flashing the latest SBF for your phone/bootloader) should bring everything on your phone back in line, making it safe to take future OTA's

Related

[Q] Anyone downgraded from 5.0.2. to 4.4.4

Hello, I have upgraded to 5.0.2. via OTA a few days ago. My phone was RetEU .23, and the update notification that 5.0.2. became so annoying, so I decided to give it a shot. Lollipop is a disappointment for me, battery drain issues, lagging all over the menus, slow dialer, the phone was running better with KK installed, so I want to return back to 4.4.4.
Unfortunately there is no clear opinion whether this could be done, some say that when you have 5.0.2. bootloader installed with the OTA, you cannot go back, others say that it is no problem to do so. Really confusing.
Anyone tried to go back to 4.4.4. after getting the OTA? Could you please share how did you do so? Unlocking the bootloader and flashing one of the 4.4.4 stock ROMs from the General Section?
dub_1 said:
Hello, I have upgraded to 5.0.2. via OTA a few days ago. My phone was RetEU .23, and the update notification that 5.0.2. became so annoying, so I decided to give it a shot. Lollipop is a disappointment for me, battery drain issues, lagging all over the menus, slow dialer, the phone was running better with KK installed, so I want to return back to 4.4.4.
Unfortunately there is no clear opinion whether this could be done, some say that when you have 5.0.2. bootloader installed with the OTA, you cannot go back, others say that it is no problem to do so. Really confusing.
Anyone tried to go back to 4.4.4. after getting the OTA? Could you please share how did you do so? Unlocking the bootloader and flashing one of the 4.4.4 stock ROMs from the General Section?
Click to expand...
Click to collapse
Hello,
i actually switched from 5.0.2 back to KK 4.4.4 from Pizza_dox
when your bootloader is unlocked and you have TWRP installed
follow these instructions
1, go do a factory reset
2, go to advanced wipe and select :dalvik cache/system/data/internal storage/cache
when you did that there is no system on your phone so when you restart you will be going into an endless bootloop.
3, go press install and select the Microkat.zip file from Pizza_Dox
when that is done you have agian kitkat on your device
i think there some other methods but this is how i did it succesfully.
Also dont forget to make a backup because you will lose everything.
Gerriitw said:
Hello,
i actually switched from 5.0.2 back to KK 4.4.4 from Pizza_dox
when your bootloader is unlocked and you have TWRP installed
follow these instructions
1, go do a factory reset
2, go to advanced wipe and select :dalvik cache/system/data/internal storage/cache
when you did that there is no system on your phone so when you restart you will be going into an endless bootloop.
3, go press install and select the Microkat.zip file from Pizza_Dox
when that is done you have agian kitkat on your device
i think there some other methods but this is how i did it succesfully.
Also dont forget to make a backup because you will lose everything.
Click to expand...
Click to collapse
Thanks for your comment. I actually plan to go back to the stock 4.4.4. I have a basic idea of bootloader and things but not deep into this and have never done it before. From what I have read , I will have to:
1. First I need to unlock the bootloader, as per the instructions in the Moto website.
2. Then I will need to do a factory reset. (settings-secuirity-factory reset or some other way of doing this?)
3. Download 4.4.4 firmware + script.
4. Start up with Power+VolDown buttons and have bootloader menu on screen
5. Run the downloaded script from its .bat file.
6. Wait for some time for the flashing to end, then have stock 4.4.4
Please correct me if something is wrong or missed.
dub_1 said:
Thanks for your comment. I actually plan to go back to the stock 4.4.4. I have a basic idea of bootloader and things but not deep into this and have never done it before. From what I have read , I will have to:
1. First I need to unlock the bootloader, as per the instructions in the Moto website.
2. Then I will need to do a factory reset. (settings-secuirity-factory reset or some other way of doing this?)
3. Download 4.4.4 firmware + script.
4. Start up with Power+VolDown buttons and have bootloader menu on screen
5. Run the downloaded script from its .bat file.
6. Wait for some time for the flashing to end, then have stock 4.4.4
Please correct me if something is wrong or missed.
Click to expand...
Click to collapse
What i did...
Download the correct kk stock rom
Setup my drivers and mfastboot correctly (simple fast boot works too)
Unlocked bootloader. (Voids warranty coz gives bootloader status 3)
Reboot in bootloader now...
Flash all files of kitkat except gpt.bin and motoboot.bin (they never flash for me lol )
Flash all other files (i typed filenames manually)
Fastboot reboot
Ps - no matter what i do..i have not been able to lock my bootloader once i downgraded from 5.0.2 to 4.4.4
Locking bootloader works well on 5.0.2
doctor_droid said:
What i did...
Download the correct kk stock rom
Setup my drivers and mfastboot correctly (simple fast boot works too)
Unlocked bootloader. (Voids warranty coz gives bootloader status 3)
Reboot in bootloader now...
Flash all files of kitkat except gpt.bin and motoboot.bin (they never flash for me lol )
Flash all other files (i typed filenames manually)
Fastboot reboot
Ps - no matter what i do..i have not been able to lock my bootloader once i downgraded from 5.0.2 to 4.4.4
Locking bootloader works well on 5.0.2
Click to expand...
Click to collapse
well guess im gonna try - but no need to do, as makes no difference except to downgrading.... So best off unlocked
simply use the 4.4.4 link in my signature and pick firmware 2 or B called DSDSALL to go back to 4.4.4 .23 ret(xx)
So, it has been confirmed by several forums that when you have officially received the 5.0.2 OTA download update, you cannot go back to KK.
It has something to do with the new L bootloader. I guess that there is no way of doing this, up to now at least. Don't know if someone has tried and succeeded.
When you have flashed the 5.0.2. OTA however, you can have KK installed back, as most of the users on xda.
dub_1 said:
So, it has been confirmed by several forums that when you have officially received the 5.0.2 OTA download update, you cannot go back to KK. FALSE
It has something to do with the new L bootloader. I guess that there is no way of doing this, up to now at least. Don't know if someone has tried and succeeded. FALSE
When you have flashed the 5.0.2. OTA however, you can have KK installed back, as most of the users on xda.
Click to expand...
Click to collapse
YES you can install kitkat see my signature you NEED a unlocked boot loader
I have been up / down and sideways with ALL 4 versions ( 3 kitkat 1 Lollipop) of XT1068 firmware 50+ installs , a few soft bricks - also installed a few custom roms - gone back to lollipop and kitkat from these too.
see my signature for 4.4.4 and 5.0.2 firmware xt1068
reefuge said:
YES you can install kitkat see my signature you NEED a unlocked boot loader
I have been up / down and sideways with ALL 4 versions ( 3 kitkat 1 Lollipop) of XT1068 firmware 50+ installs , a few soft bricks - also installed a few custom roms - gone back to lollipop and kitkat from these too.
see my signature for 4.4.4 and 5.0.2 firmware xt1068
Click to expand...
Click to collapse
Cheers mate. Already installed stock 4.4.4.
Does it make sense to relock the bootloader?
dub_1 said:
Cheers mate. Already installed stock 4.4.4.
Does it make sense to relock the bootloader?
Click to expand...
Click to collapse
no absolutely not....... boot logo warning still comes up ...warranty still void and strangely if been to 5.0.2 and back to 4.4.4 it wont relock
but you can relock if on 5.0.2
Successful downgrade from 5.0.2 to 4.4.4
Dear All,
Pls help me in downgrading from 5.0.2 to 4.4.4 on my XT1068 Dual Sim Indian Version.
I need to know whether we can return to 4.4.4 without unlocking bootloader and is rooting needed.
Pls let me know your experience in a noob friendly way.
TIA... :angel:
dub_1 said:
Cheers mate. Already installed stock 4.4.4.
Does it make sense to relock the bootloader?
Click to expand...
Click to collapse
What exactly did you do? His signature is gone...

[Q] Unlocked Bootloader running 5.01 - is it safe to upgrade OTA to 5.1?

Hi Noob question here, I don't want to root or flash my Nexus 6, I bought it from a guy 2nd hand and he had flashed various roms. He restored it to stock android before selling it to me - It has the unlocked padlock on boot - Unlocked Bootloader running 5.01 - is it safe to upgrade OTA to 5.1? Will there be any danger of bootloop?
What should I do?
@Darius,
Unlocked bootloader has no effect on installing OTA.
Yes, there's always a risk of bricking if you don't follow the directions precisely. There are several "how to" threads. Read, understand, and ask questions.
Whatever you do, relocking the bootloader is probably not the answer ?
Sent from my Google N6 on VZ
Darius said:
Hi Noob question here, I don't want to root or flash my Nexus 6, I bought it from a guy 2nd hand and he had flashed various roms. He restored it to stock android before selling it to me - It has the unlocked padlock on boot - Unlocked Bootloader running 5.01 - is it safe to upgrade OTA to 5.1? Will there be any danger of bootloop?
What should I do?
Click to expand...
Click to collapse
If the device is completely stock (including recovery), you should be able to take the OTA. Unless there is something wrong with your device hardware, I don't see any risk. It is just a regular OTA you get from google, direct to device, and you just apply it. Just make sure your phone has a full charge, and don't interrupt the update process.
As a precaution, you should back everything up - never say never
Oh, and to second what DebianDog wrote, don't lock your bootloader
Thanks for all the tips guys, applying update right now...
I have been trying to upgrade my Sprint Nexus6 for the last 3 days. the download goes well the install gets halfway through the blue line under the Android and then he lays down with an "Red Error"
boot loader unlocked and rooted running Stock 5.01. suggestions of the log files i should pull to help narrow this down?
myopic said:
I have been trying to upgrade my Sprint Nexus6 for the last 3 days. the download goes well the install gets halfway through the blue line under the Android and then he lays down with an "Red Error"
boot loader unlocked and rooted running Stock 5.01. suggestions of the log files i should pull to help narrow this down?
Click to expand...
Click to collapse
Nothing needed to narrow it down - you cant take the OTA if you rooted -> because rooting installs SU -> which changed your /system partition -> it no longer matches what the OTA looks at -> and it will fail, sorry.
Unroot it and you might try it again, or you would have to re-flash a stock image to be clean and then take it. The bootloader being unlocked is not the cause.

moto x 1st gen 4.2.2 Upgrade to 5.1

Verizon
Moto X 1st Gen
Android 4.2.2 - Stock rooted
Unlocked Boot loader - not DEV edition though
TWRP 2.7.1.1 recovery
Question:
To upgrade to 5.1 do I just need to revert back to stock boot loader and do an OTA update?
Will the OTA re-lock my boot loader?
After the upgrade to 5.1 do I just reload TWRP recovery and flash SU for root access again?
No the new updates do not relock the bootloader. I suggest you first try out the Lollipop by flashing it through latest version of TWRP. If you think you can live with it than just flash complete stock through rsdlite or manually by fastboot. Reason I say that is because once you take the OTA it will update both bootloader version and the partition tables which means you won't be able to revert back to a lower Android version without the risk of bricking your device.
Sent from my Moto X
bushako said:
No the new updates do not relock the bootloader. I suggest you first try out the Lollipop by flashing it through latest version of TWRP. If you think you can live with it than just flash complete stock through rsdlite or manually by fastboot. Reason I say that is because once you take the OTA it will update both bootloader version and the partition tables which means you won't be able to revert back to a lower Android version without the risk of bricking your device.
Sent from my Moto X
Click to expand...
Click to collapse
I don't want to go back to complete stock, I want to keep bootloader unlocked and root. Is there a stock rooted rom out there I can flash w/ TWRP without having to do OTA or flashing the recovery back to stock?
Yes there is its in the development section. You'll read the thread something like xt1053 stock flash-able. It contains only the kernel and system files so you should be good.
Here http://forum.xda-developers.com/showthread.php?t=3155843
Sent from my Moto X
-RanZ- said:
Verizon
Moto X 1st Gen
Android 4.2.2 - Stock rooted
Unlocked Boot loader - not DEV edition though
TWRP 2.7.1.1 recovery
Question:
To upgrade to 5.1 do I just need to revert back to stock boot loader and do an OTA update?
Will the OTA re-lock my boot loader?
After the upgrade to 5.1 do I just reload TWRP recovery and flash SU for root access again?
Click to expand...
Click to collapse
First off, there is no Verizon 5.1 yet. So any 5.1 you try will be for a different model, and if you flash a full rom, it will have different radios (which don't work for CDMA that Verizon still uses for voice/3g data. If you keep your stock VZW radio files, keep in mind they will be on a different version than the rest of the rom which could cause some inconsistencies and issues. IF you do flash a FULL SBF, you will be stuck with no SAFE way to revert to 4.4.4 due to GPT.BIN/Motoboot.img (for more on this, see the link in my signature), and you'll have to wait for the Verizon 5.1 SBF to get back to Verizon's rom.
Next, to install an OTA update, when it becomes available, you need STOCK RECOVERY on your phone. The OTA also does a pre-flash check/validation of your phone before it flashes, so if anything it looks for is not what it expects, the OTA will fail. Because of that you need to be 100% stock, or very near to it.
Finally, NO, an OTA will not relock your bootloader, nor will flashing an SBF.
For more on taking an OTA, see the link in my signature on OTA Updates..
That being said, if you TRY a 5.1 rom that is out there for another model you best bet is to find one that is a TWRP back up of 5.1 installed on someone's phone, since it only updates system.img and boot.img. It may not work 100% (because part of your phone will still have the 4.4.4 files), but it will give you a taste and you could later revert back to the stock 4.4.4 which you currently have on your phone. IF you flash a FULL SBF, you might be stuck with no way to revert to 4.4.4 due to GPT.BIN/Motoboot.img (for more on this, see the link in my signature)
Hi Bushako, I've Moto X Verizon XT1060 and it's struck in 4.2.2 android. When I try to update using setting, about phone and system update it show there is no update available but the android version on it is 4.2.2
5.1 is available for Verizon Moto X 1st gen now isn't it? I am googling for a detailed process on how to update from 4.2.2 to 5.1 and keeping root but not having any luck finding anything. Is it easy to update from 4.2.2 stock rooted to 5.1? The specs of my phone are the same as the original post:
Verizon
Moto X 1st Gen
Android 4.2.2 - Stock rooted
Unlocked Boot loader - not DEV edition though
TWRP 2.7.1.1 recovery
-RanZ- said:
5.1 is available for Verizon Moto X 1st gen now isn't it? I am googling for a detailed process on how to update from 4.2.2 to 5.1 and keeping root but not having any luck finding anything. Is it easy to update from 4.2.2 stock rooted to 5.1? The specs of my phone are the same as the original post:
Verizon
Moto X 1st Gen
Android 4.2.2 - Stock rooted
Unlocked Boot loader - not DEV edition though
TWRP 2.7.1.1 recovery
Click to expand...
Click to collapse
Aug 1, when I last posted in this thread, Verizon 5.1 wasn't available. It is now.
As for updating and keeping root, there are a few ways to do it. Since you say your Bootloader is unlocked, the best way is flash 5.1 SBF, and use the process of flashing TWRP and SuperSU to root and have Write protection Disabled (see -> http://forum.xda-developers.com/moto-x/general/how-to-how-to-root-5-1-unlocked-t3140217 ). If you're bootloader isn't unlocked yet, and if you are on 4.4.2 or lower and have NEVER upgraded to 4.4.4 or 5.1, use Sunshine to unlock the bootloader FIRST
If you're bootloader isn't unlocked, there is only one way to root 5.1, but it doesn't disable write protection, and its risky because it intentionally soft bricks the phone back to the Qualcomm HS-USB QDLoader mode.
KidJoe said:
Aug 1, when I last posted in this thread, Verizon 5.1 wasn't available. It is now.
As for updating and keeping root, there are a few ways to do it. Since you say your Bootloader is unlocked, the best way is flash 5.1 SBF, and use the process of flashing TWRP and SuperSU to root and have Write protection Disabled (see -> http://forum.xda-developers.com/moto-x/general/how-to-how-to-root-5-1-unlocked-t3140217 ). If you're bootloader isn't unlocked yet, and if you are on 4.4.2 or lower and have NEVER upgraded to 4.4.4 or 5.1, use Sunshine to unlock the bootloader FIRST
If you're bootloader isn't unlocked, there is only one way to root 5.1, but it doesn't disable write protection, and its risky because it intentionally soft bricks the phone back to the Qualcomm HS-USB QDLoader mode.
Click to expand...
Click to collapse
Bootloader is unlocked, I get the warning every time I restart the phone.
Where can I find the SBF files? Every post I find from a search the links do not work.
Are the SBF files stock or from someone else's phone?
Do I flash the files with my currently installed TWRP?
When I flash the SBF does it remove TWRP so I have to re flash it?
Are there any radio upgrades/do they get done w/ the SBF?
Sorry if these are basic questions, I have not done much phone rooting since my old HTC Incredible.
-RanZ- said:
Bootloader is unlocked, I get the warning every time I restart the phone.
Where can I find the SBF files? Every post I find from a search the links do not work.
Are the SBF files stock or from someone else's phone?
Do I flash the files with my currently installed TWRP?
When I flash the SBF does it remove TWRP so I have to re flash it?
Are there any radio upgrades/do they get done w/ the SBF?
Sorry if these are basic questions, I have not done much phone rooting since my old HTC Incredible.
Click to expand...
Click to collapse
There is a link in my signature to a thread containing the known places that were hosting the SBF/FXZ files. That is the only place I can suggest you look.
SBF/FXZ files I'm taking about are stock, and digitally signed by Motorola. They can be flashed on phones with locked or unlocked bootloaders. NOTE: make sure you get the SBF for your device model and carrier!!
You flash these via Mfastboot or RSDLite. When using these tools you are flashing back to stock. After you get the SBF file, see -> http://forum.xda-developers.com/showpost.php?p=61142892&postcount=2 and read the REQUIREMENTS section, and pick either Option 3, 4 or 5 to actually flash (only use one option. which ever you find the easiest. Do NOT use Option 1 or 2 as they would not apply to your situation). I usually recommend option 5.
Yes, the process of flashing the entire SBF will overwrite TWRP with stock recovery. You'll need to flash it later as part of the rooting process.
Yes there are radio updates in the newer SBF files.
So basically, you flash to stock 5.1 by using the SBF files (following the requirements and ONE of the options in http://forum.xda-developers.com/showpost.php?p=61142892&postcount=2 again,I usually recommend option 5), then root by following http://forum.xda-developers.com/moto-x/general/how-to-how-to-root-5-1-unlocked-t3140217
One other tip... Make a back up of your phone BEFORE YOU FLASH. copy all data from the /sdcard area to your PC, make a list of all your apps, etc. And seriously consider erasing your UserData while flashing (wipes the phone clear), or doing a factory reset before you flash.
I only say this because 5.1 seems more stable (and less buggy) if a factory reset is done before/during the upgrade process.
EDIT: The 5.1 SBF file you want for a Verizon XT1060 is GHOST_VERIZON_5.1_LPA23.12-39.7_cid2_CFC.xml.zip and is available from -> http://motofirmware.center/files/category/11-moto-x-1st-generation/
KidJoe said:
There is a link in my signature to a thread containing the known places that were hosting the SBF/FXZ files. That is the only place I can suggest you look.
SBF/FXZ files I'm taking about are stock, and digitally signed by Motorola. They can be flashed on phones with locked or unlocked bootloaders. NOTE: make sure you get the SBF for your device model and carrier!!
You flash these via Mfastboot or RSDLite. When using these tools you are flashing back to stock. After you get the SBF file, see -> http://forum.xda-developers.com/showpost.php?p=61142892&postcount=2 and read the REQUIREMENTS section, and pick either Option 3, 4 or 5 to actually flash (only use one option. which ever you find the easiest. Do NOT use Option 1 or 2 as they would not apply to your situation). I usually recommend option 5.
Yes, the process of flashing the entire SBF will overwrite TWRP with stock recovery. You'll need to flash it later as part of the rooting process.
Yes there are radio updates in the newer SBF files.
So basically, you flash to stock 5.1 by using the SBF files (following the requirements and ONE of the options in http://forum.xda-developers.com/showpost.php?p=61142892&postcount=2 again,I usually recommend option 5), then root by following http://forum.xda-developers.com/moto-x/general/how-to-how-to-root-5-1-unlocked-t3140217
One other tip... Make a back up of your phone BEFORE YOU FLASH. copy all data from the /sdcard area to your PC, make a list of all your apps, etc. And seriously consider erasing your UserData while flashing (wipes the phone clear), or doing a factory reset before you flash.
I only say this because 5.1 seems more stable (and less buggy) if a factory reset is done before/during the upgrade process.
EDIT: The 5.1 SBF file you want for a Verizon XT1060 is GHOST_VERIZON_5.1_LPA23.12-39.7_cid2_CFC.xml.zip and is available from -> http://motofirmware.center/files/category/11-moto-x-1st-generation/
Click to expand...
Click to collapse
I will give this a try if I can locate the correct SBF files, your information has helped greatly, Thanks!
nevermind, google fixed me.

At&t failing 5.1 update

Just bought an at&t variant on craigslist, I did a factory reset and tried to run the 5.1 update and I get an error updating, it downloads update.. then it reboots and starts installing showing the android guy working , then about 20 seconds into it it shows the little android guy on his back with a red exclamation and says error and then proceeds to reboot. Once rebooted it says it failed to update. I'm used to Samsung phones .. hoping there's an odin type option to get a stock 5.1 or rooted stock 5.1 on this guy, any headstart info would be appreciated. thanks
Here is the AT&T 5.0.2 firmware:
http://www.filefactory.com/file/1cekivswpakf/VICTARA_ATT_XT1097_5.0.2_LXE22.46-34_cid1_CFC.xml.zip
If you want to unlock your bootloader or root your phone don't upgrade yet! While you still have 5.0.2, root is possible with mofo and unlocking the bootloader can be done with sunshine. After you upgrade to 5.1 you can't downgrade nor root it. If you unlock it now and root it now, then you can keep root when you go to 5.1. But if you go to 5.1 before that you are screwed and lose the ability to do it forever.
We don't use odin. We have a tool called RSDLite. Search for it on these forums and you will find it and instructions on how to use it.
Sent from my XT1095 using Tapatalk
thanks for the heads up.. Glad I decided to wait and not try to figure out that update.. then not be able to root.
thanks

Stopped Android update from Kitkat to Lollipop now Android is No Command :(

I heard lollipop drains battery fast so I tried stopping update midway now my stock kitakat is corrupt. Please advice how to install stock Kitkat in my motorola droid turbo xt1254.
Note my usb debbuging is off in phone settings and the device is not being recognised by RDS Lite even though i tried reinstalling motorola device manager. It says update is N/A.
Thanks in advance
Crunch7
At the very least, you have a lollipop recovery on the phone and will not accept KitKat reinstallation. It is likely that you bricked the phone, but not totally certain. Try putting the phone in fastboot for RSDlite. If you can't do that, you may be SOOL. Once you do get a stock ROM on, unlock the bootloader with 'Sunshine', then you can do about anything you want.
Sent from my XT1254 using Tapatalk
There's three versions of Verizon firmware that can be bootloader unlocked via Sunshine. Make sure you do NOT update to the very latest, which cannot be unlocked. Once bootloader is unlocked you can then downgrade back to Kitkat if you wish.
You can't downgrade bootloader, but with unlocked bootloader you can downgrade firmware. With a locked bootloader you can't downgrade anything.

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