After I upgraded my LG G3 to 5.0 I decided to downgrade it back down to 4.4.2 because 5.0 was crashing randomly. After I got 4.4.2 installed back onto the phone, McAfee shows up automatically and wants a PIN. I never made one.
I can't factory reset the device, it tells me the kill switch is disabled. Also, USB download mode is also disabled by McAfee. I'm at a loss, what do I do?
I've tried 123456 and 000000 as some other members have tried, but they don't work.
Jaradice said:
After I upgraded my LG G3 to 5.0 I decided to downgrade it back down to 4.4.2 because 5.0 was crashing randomly. After I got 4.4.2 installed back onto the phone, McAfee shows up automatically and wants a PIN. I never made one.
I can't factory reset the device, it tells me the kill switch is disabled. Also, USB download mode is also disabled by McAfee. I'm at a loss, what do I do?
I've tried 123456 and 000000 as some other members have tried, but they don't work.
Click to expand...
Click to collapse
I have the same problem, did you find the solution? please help me:crying:
Try flashing tot file for your model
montresor60 said:
Try flashing tot file for your model
Click to expand...
Click to collapse
when i put the phone in dowload mode, this say that has been desible by killer switch
Try this:
- Go to: https://www.mcafeemobilesecurity.com.
- Click Forgot your PIN at the top of the page.
- A link with PIN reset instructions is the sent to your registered email.
- Follow the instructions to reset the PIN.
Jaradice said:
After I upgraded my LG G3 to 5.0 I decided to downgrade it back down to 4.4.2 because 5.0 was crashing randomly. After I got 4.4.2 installed back onto the phone, McAfee shows up automatically and wants a PIN. I never made one.
I can't factory reset the device, it tells me the kill switch is disabled. Also, USB download mode is also disabled by McAfee. I'm at a loss, what do I do?
I've tried 123456 and 000000 as some other members have tried, but they don't work.
Click to expand...
Click to collapse
Hi. I think I can help you. Because I have the same problem ago and I solved it.
The way is :
1、reboot your phone again and again until mcafee not auto-start (trust me you can )
2、if you into the system without mcafee successful，Congratulations on your！You have achieved half of success！
3、download towelroot and installed to root your phone
4、after that. Your phone will restart ，then you have the same work likes step 1
5、download TitaniumBackup and installed，then find mcafee on TitaniumBackupal and unInstalled
6、then your phone will work normal，good luck for you.
(I am sorry my English is poor because I am come from China)
xbustama said:
when i put the phone in dowload mode, this say that has been desible by killer switch
Click to expand...
Click to collapse
Of course. I did read your post but must have had a brain fart when responding.
Eenie_胜胜 said:
Hi. I think I can help you. Because I have the same problem ago and I solved it.
The way is :
1、reboot your phone again and again until mcafee not auto-start (trust me you can )
2、if you into the system without mcafee successful，Congratulations on your！You have achieved half of success！
3、download towelroot and installed to root your phone
4、after that. Your phone will restart ，then you have the same work likes step 1
5、download TitaniumBackup and installed，then find mcafee on TitaniumBackupal and unInstalled
6、then your phone will work normal，good luck for you.
(I am sorry my English is poor because I am come from China)
Click to expand...
Click to collapse
I will try it, thanks a lot
xbustama said:
I will try it, thanks a lot
Click to expand...
Click to collapse
I had to login and reset the PIN and it finally let me in. Now it's rooted and I got custom firmware on it. Great phone, but that McAfee crap shouldn't be a thing....
Thank you to everyone who tried to help
Kill Switch Disabled / Black Screen After Factory Data Reset
I just had this problem too; after Factory Data Reset ("FDR") from the "Settings" menu, I went thru setup, opened my Google Backup, watched my Apps reinstalling, then ended up with a black screen showing only the status indicators at the top, and the "Back" arrow at the bottom.
After trying hardware FDS a couple of times, I got a message saying "....Kill Switch Disabled" and then the black screen again.
It turned out that I had installed McAfee antivirus on my phone, including a feature (Kill Switch) which would prevent anyone who got hold of my phone from wiping it and re-selling it for someone else to use.
Once I realized this, all I had to do was log in to my McAfee for Android account from my computer and disable that setting. I don't remember the details of doing so, but it was fairly self-evident once I realized what was happening.
Good Luck
Eenie_胜胜 said:
Hi. I think I can help you. Because I have the same problem ago and I solved it.
The way is :
1、reboot your phone again and again until mcafee not auto-start (trust me you can )
2、if you into the system without mcafee successful，Congratulations on your！You have achieved half of success！
3、download towelroot and installed to root your phone
4、after that. Your phone will restart ，then you have the same work likes step 1
5、download TitaniumBackup and installed，then find mcafee on TitaniumBackupal and unInstalled
6、then your phone will work normal，good luck for you.
(I am sorry my English is poor because I am come from China)
Click to expand...
Click to collapse
i can reboot phone without mcafee auto-start but it can't install everythink. and it doesn't matter install from google play or other sources.
https://forum.xda-developers.com/lg...are-method-t3534946/post70470494#post70470494
While old, this is probably still relevant - I came here via a search, and found this to be the only way to resolve the McAfee lock. I was trying to downgrade an LG G3 D855 phone so that I could root it, and flashed a file that was supposed to be a stock ROM, D85510A_00.kdz, the oldest KitKat file for this phone. Big mistake, it had NcAfee installed and locked the phone. My McAfee was registered to an email address, and the only way to unlock it was to log on to "my" McAfee account, or have an email sent to this address. McAfee tech support had a very supportive attitude, but couldn't do anything as they didn't have the email address registered. They didn't know their own product too well, suggesting that if I managed to start in Safe Mode I could remove the McAfee app. Not so. Recovery and download modes reported that they had been disabled by the "kill switch". There was nothing I, or McAfee could do.
I came to this thread; the fundamental fact I learnt is that repeated rebooting eventually got the phone started without locking. It didn't work very well, presumably with McAfee using system resources as it tried to lock; it wasn't possible to install anything from the play store ("downloading" for 5 minutes or so until I gave up), and programs worked slowly and not very well with McAfee active and trying to do its thing.
The exact procedure listed here didn't work for me, but once I knew I could get into the phone by repeated restarting I could try anything; anyone reasonably familiar with Android should be able to cope with whatever the system throws up. I first installed Towelroot 3.0, which rooted the phone without needing a reboot I installed files by writing the .apks to the SD card on a computer. I installed the System 2 task manager, Titanium Backup application, and SuperSU at various times. I also installed Total Commander, my preferred file manager, though the built-in one might have been enough. The first thing to do to stop McAfee from undoing everything, once rooted to provide access to its file /system/priv-app/LGMcAfee.MobileSecurity.apk, was to stop the process with System2. (Until then I had done various things, but later found that McAfee had managed to undo them and resuscitate itself on next reboot.) After stopping the process, I deleted McAfee with Titanium Backup. That's the essential unlocking bit. I also installed the TWRP app and used it to flash the TWRP recovery. So I had a phone working well, rooted, with the earliest release of KitKat. Booting in factory reset mode and ignoring the warnings that everything will be deleted starts TWRP in the way I've been used to, and allowed me to restore a backup of the phone (or install a custom ROM).
[When repeatedly rebooting until McAfee doesn't kill, find something not very taxing to do, e.g. watch a video., so the time is not entirely wasted.]
[Added later]: instead of repeated rebooting, it's been suggested that if you manage to go to Settings > General after the boot process has finished but before McAfee has loaded (about 5"), McAfee will not fully start and you can do the root, terminate, remove process. As before the phone will be sluggish and not work properly, and the Play Store will not work, until McAfee is terminated. Put .apks on an SD card, or use a browser to download them from the phone.
[emoji106][emoji106]?[emoji106]?
Great example of perseverance and not giving up. I probably would've. [emoji37][emoji36]
Kudos.
LG G3 D851, crDroidAndroid v4.6 ROM, microG (NoGapps), MultiROM, XDA Legacy
Related
Hi,
I wanted to unroot and reset to stock my phone. I used LGFlashTool and TOT and DLL from this website:
http://lgg3root.com/lg-g3-stock-factory-firmware/
LG G3 Stock Factory Firmware D855 (European)
Download Android 4.4.2 V10E LG G3 Stock Firmware D855 European 32GB
Download D855 DLL
It worked all fine, but when I started and set up Android for the first time after flashing, it started immediately to install 103 Apps out of nowhere after arriving at the homescreen. See Screenshots.
This happens although I am in Flight Mode and not logged into my Google account yet. And there is no deinstalling them, I can only deactivate them.
Hard Reset didn't change anything. Flashing any other kdz (complete wipe/format with CMS Flash) doesn't help either. As soon as I get to the homescreen after setup these annoying 103 apps start to install themselves.
Since there is no SD card, these Apps must be saved somewhere on the internal space. But how do I get rid of them and the command that starts to install them magically?
Thanks for helping
Felix
I just tried to delete all the bloat Apps with NoBloat Free and System App Remover after I rooted the phone. It worked and the Apps didn't install themselves again after I restarted the phone.
But as soon as I hard reset Android, they get installed again directly after the phone setup.
These apps and the command to get installed must be saved somewhere on the internal space.
Does anyone know how this works and how I can completely removed this annoying software?
Thanks
Felix
i assume your carrier just pushes them on your device somehow, so i'd say it's hard coded just like the LG logo on boot
Freeze them with Titanium Backup is your best bet, they won't do any harm thatway, or get re-downloaded
ive seen this too, not just orange apps though, after the flash it installs orange, vodafone, singtel, plus mobile and a ton of others, were talking over 100 apps that just install automatically after reset even with no data connection, i have no idea why its happening and i cant seem to stop it
Hello a question how could remove from my Google account LG g4 was looking on the web that there are tools to remove it from the download mode. If someone would be so kind as to pass me the link.:crying::crying:
And if there is no way to get the link wanted to ask another question no way to unlock if you installed another ROM. through TWRP. Installing a custom ROM but factory.
I wish someone would help me because I spent $ 350 on this phone and when I got what I restore factory asked me Google Account before and now I can only use it as a guest mode and have many limitations I can not Install application than Google Play and I can not read my messages I can not pass data from the computer to my phone please someone help me I would appreciate it thanks in advance:crying::crying::crying::crying:
my phone model is LG G4 T-Mobile H811
luismiguelpc said:
Hello a question how could remove from my Google account LG g4 was looking on the web that there are tools to remove it from the download mode. If someone would be so kind as to pass me the link.:crying::crying:
And if there is no way to get the link wanted to ask another question no way to unlock if you installed another ROM. through TWRP. Installing a custom ROM but factory.
I wish someone would help me because I spent $ 350 on this phone and when I got what I restore factory asked me Google Account before and now I can only use it as a guest mode and have many limitations I can not Install application than Google Play and I can not read my messages I can not pass data from the computer to my phone please someone help me I would appreciate it thanks in advance:crying::crying::crying::crying:
my phone model is LG G4 T-Mobile H811
Click to expand...
Click to collapse
I assumed you reset your phone while it's still locked and you forgot your Google account, is this correct?
If yes, then sadly there's no way to unlock the phone without your former Google account, as far as I know.
This was made by Google to prevent theft on your phone as explained in http://www.androidpolice.com/2015/0...evice-protection-feature-and-how-do-i-use-it/
And what about people like me who are the phone is locked by mistake?
I assumed you reset your phone while it's still locked and you forgot your Google account, is this correct?
If yes, then sadly there's no way to unlock the phone without your former Google account, as far as I know.
This was made by Google to prevent theft on your phone as explained in
Click to expand...
Click to collapse
And what about people like me who are the phone is locked by mistake?
Google "quick shortcut lg g4" install 2. Use dual window to run (using hardware keys) search "master" select ma$ter Reset. Done. Sent from LG G4 (unlocked with this procedure.
luismiguelpc said:
Hello a question how could remove from my Google account LG g4 was looking on the web that there are tools to remove it from the download mode. If someone would be so kind as to pass me the link.:crying::crying:
And if there is no way to get the link wanted to ask another question no way to unlock if you installed another ROM. through TWRP. Installing a custom ROM but factory.
I wish someone would help me because I spent $ 350 on this phone and when I got what I restore factory asked me Google Account before and now I can only use it as a guest mode and have many limitations I can not Install application than Google Play and I can not read my messages I can not pass data from the computer to my phone please someone help me I would appreciate it thanks in advance:crying::crying::crying::crying:
my phone model is LG G4 T-Mobile H811
Click to expand...
Click to collapse
Try pulling your sim card and resetting again. When it starts up DONT turn on internet.. When you get the "configuring your phone" screen use power and volume up 4 or 5 times then power and volume down 4 or 5 times.. If it doesnt work keep trying. I just randomly pressed the key combinations and it went to a "skip activation" option and bypass google FRP.. (i was stuck on the configuration screen and it didn't give the the chance to log into my account) Once your in ADD YOUR GOOGLE ACCOUNT TO THE PHONE AND RESET IT AGAIN.. youve just effectively took over the phone. Hope that helps..
First of all, I salute everybody that chips in to this comunity, active or less ! G'day, gents !
And now, to the problem(s) :
I have a stock 16g/2g D855 (Romania/Orange), no root, no tweaks, nothing, except an original battery change couple of months back.
My phone didn't take OTA updates, don't know why, but i've been updating it via PC Suite / Mobile Support Tool.
Last update was 5.0, all was fine.
Now, on the other hand, after the update to 6.0, a small hell broke loose.
First of all, until now, after the power on LG image, i had a small LG animation, now it has changed to some stupid Orange explosion crap + wallpaper. That doesn't bother me that much, but the fact that whatever wallpaper i choose, it changes it back to the Orange one right after restart...
Second, and third, and fourth & fifth ...
QuickCircle apps no longer work (even though they are activated and selected), so my "submarin"ish flip case is useless... Facedetection, no reaction... KnockCode, same thing, doesn't even lock the phone, no matter the security type. I can't even change my Display Off style anymore. Developer Options, gone, not available for this user (altough user is owner) and clicking hundreds of times on build no. doesn't do anything. Notification bar, no kind of available selection on it (like wifi or data, etc), except user & the notification button in the button bar doesn't even slide it down. Plus a couple more of these "small unfortunate events" :silly:
But the biggest problem is that when and if i turn on the wifi, the phone almost instantly restarts, and keeps doing so if i'm not fast on the touch and disable it (like split second after finshing boot) and thus becoming an unusable plastic...:crying:
So i've tried reinstalling the update, via Recovery Upgrade two times (all went smooth) but problems are still there. I'm starting to think that this might be a something wrong with the update. Eitherway, main concern is, what do i do now ? Wireless is 30% of my job...
Specifing that i'm pretty much a noobie at this kind of stuff, thank you all for taking the time to read about my problem !:highfive:
the software may be having some issues, i recommend that you download the kdz file for the software and flash it via flashtool, all problems should be fixed and the o2 bloat will be removed.
d855 kdz (30B):http://csmgdl.lgmobile.com/dn/downloader.dev?fileKey=FW4DCC3332TXAZRAB5452PI/D85530B_00_1217.kdz
lg flashtool:http://lgflashtool.com/download/LG-Flash-Tool-2014.zip
ModekXKay said:
the software may be having some issues, i recommend that you download the kdz file for the software and flash it via flashtool, all problems should be fixed and the o2 bloat will be removed.
d855 kdz (30B): csmgdl.lgmobile. com/dn/downloader.dev?fileKey=FW4DCC3332TXAZRAB5452PI/D85530B_00_1217.kdz
lg flashtool: lgflashtool. com/download/LG-Flash-Tool-2014.zip
Click to expand...
Click to collapse
Thank you for your reply
But doesn't this require root ?
And most of all, won't i lose everything ? Settings, accounts, contacts, data ? Or is there anyway to backup everything ?
andy_krt said:
Thank you for your reply
But doesn't this require root ?
And most of all, won't i lose everything ? Settings, accounts, contacts, data ? Or is there anyway to backup everything ?
Click to expand...
Click to collapse
It doesn't require root.
But it would certainly wipe everything including your internal sd. The only way is to take a backup using any app and moving the backup files temporarily to a pc or any other external storage.
Sent from my LG-D855 using XDA-Developers mobile app
Sreerag ag said:
It doesn't require root.
But it would certainly wipe everything including your internal sd. The only way is to take a backup using any app and moving the backup files temporarily to a pc or any other external storage.
Click to expand...
Click to collapse
Thank you for replying
Ok, seems logical. Any advice about some software that cand do that properly ?
I mean all & all. Accounts, passwords, contacts and so on...because I can't remember my Google account pass (or any other one for that matter) for the life of me, and the maps to the nav app are a pain to dld.
And besides that, can the backup be actually performed, since i can't access the Developer Debug Mode ?
andy_krt said:
Thank you for replying
Ok, seems logical. Any advice about some software that cand do that properly ?
I mean all & all. Accounts, passwords, contacts and so on...because I can't remember my Google account pass (or any other one for that matter) for the life of me, and the maps to the nav app are a pain to dld.
And besides that, can the backup be actually performed, since i can't access the Developer Debug Mode ?
Click to expand...
Click to collapse
There are many apps on the play store for taking backups. You can use the to take backups of apps, contacts, messages and so on.
However to backup accounts, passwords and app data you require a rooted device and could use titanium backup.
Sent from my LG-D855 using XDA-Developers mobile app
Sreerag ag said:
There are many apps on the play store for taking backups. You can use the to take backups of apps, contacts, messages and so on.
However to backup accounts, passwords and app data you require a rooted device and could use titanium backup.
Click to expand...
Click to collapse
Well then that's out of the question... Having no data plan, any Play Store installation is ruled out, could probably be done via PC Suite.
I've tried using Helium, doesn't do much good. I'm thinking about rooting the phone, but with my luck, i'll probably brick it.
I wonder if there's anyway to find my Google account pass...
L.E. according to devtester, LGD855 MyIMEI A6RRTN D85530C_00 (D85530C_00_0211) is the latest version for it, pretty much the same as my last update. So ,do i re.dld this one and flash it or i go with the D85530B_00_1217 from the Quick Download page ?
L.E.2 : So far i've tried both kdz files mentioned above, plus D85521C_00_1204.kdz (Lollipop). All unsuccesful. In Download Mode, using Flash Tool as is, selecting Normal than Start. The Marshmallows kdz show the exact same problems and Lollipop doesn't even want to install. It goes up tu 4% on Pc (0 on phone) and Retry appears until Exit.
Aw man, the truth MUST be out there...
Try thos link to fix the lg flash tool stuck at 4%
http://www.theandroidsoul.com/how-t...it-stops-at-4-while-flash-kdz-firmware-80205/
Dont sweat it too much, ive been in your situation before. It sucks but the community is always by your side to fix it!
ModekXKay said:
Try thos link to fix the lg flash tool stuck at 4%
www. theandroidsoul.com/how-to-fix-lg-flashtool-problem-when-it-stops-at-4-while-flash-kdz-firmware-80205
Dont sweat it too much, ive been in your situation before. It sucks but the community is always by your side to fix it!
Click to expand...
Click to collapse
Thanks for the link, but i managed to somehow solve the problem :good:
ok, so it took some time, but finally figured this bugger out.
For anyone that needs assistance in the future, let me know and i'll support you as much as i can.
It took me 2 crazy noobie a** days, and almost lost everything, but somehow i managed not to.
So, from the start, let me just say that Remember Password on FF was heaven for me.
Mainly, for not losing everything, you definetly NEED to know your Google account. For me it was setup before to back everything up, but somehow, i forgot the pass This is where i used my PC and logged in to G+ (again, thank God for pass remembering) and reset the pass by sms. Spot on !:victory:
Then connect your phone via usb and within PC Suite (Lg Bridge didn't work for me btw) drag & drop everything from Phone to PC. Apps, contacts, messages, all.
Next, the only sofware that actually worked in flashing my G3 was LGUP. Had some problems with it by not recognising my phone, but i found a version that worked.
Once that done, i removed the Sd Card, entered Download mode and tried flashing D85530B_00_1217.kdz (MM) by selecting Upgrade. That din't work. Same problems. Tried it again, but this time selecting Refurbish (wich wipes out everything) and voila ! Alive & kickin' !
Then it's just a matter of patience resetting your phone back. Enter the Google account with your freshly changed pass and the phone will basically ask you to restore itself back.
This was a long story short, but if anyone needs more detailed aspects, let me know.
The only thing i didn't figure out yet is why the Orange bloated kdz had Slow Mo option for camera and this standard one doesn't.
Thanks to everybody for their support and the community for hosting us !
Cheers:highfive:
Hello guys, i want to update my lg to 6 android, but i cant go to download mode. I just rooted my phone, with titaniumbackup i deleted mcafee program ir my phone. BUT, i cant go to download mode anyway What should i do ..? :/
More information needed.
- What model G3 do you have?
- What Android version is currently running on the phone?
- After successfully rooting, did you install a custom recovery? If so, which one?
- Why are you attempting to go into Download mode?
- What exactly happens when you attempt to go into Download mode? Does it reboot immediately or give you an error message?
- When first powering on the device, do any error messages appear above the LG logo? If so, what do they say?
I got D855, now running lollipop 5.0 android, after root, i didnt install custom recovery. I want to go to download mode to install marshmallow 6.0 android soft, when i go into download mode, it says disabled by kill switch, like mcafee is still running on my phone. No error messages.
Andrius.sp said:
I got D855, now running lollipop 5.0 android, after root, i didnt install custom recovery. I want to go to download mode to install marshmallow 6.0 android soft, when i go into download mode, it says disabled by kill switch, like mcafee is still running on my phone. No error messages.
Click to expand...
Click to collapse
After some searching I found a post in a thread that may be useful to you. In short, it looks like you have to contact McAfee. If you can prove you are the owner of the G3, they will provide a 6-digit pin to unlock the Kill Switch. It looks like from the thread that it can be done online on their website. I found no other option to unlock the Kill Switch.
I hope this helps. Good luck!
I know the pin code, but i dont know phone number, becouse i deleted mcafee. I dont know what to do next, how i need to disable it.
Andrius.sp said:
I know the pin code, but i dont know phone number, becouse i deleted mcafee. I dont know what to do next, how i need to disable it.
Click to expand...
Click to collapse
You only deleted the McAfee app, not the entire McAfee. Re-install the app from a backup and press the 3 dots in the upper right in the McAfee app. I read somehwere that you can find information you need in there. If that fails, just call em.
How can i do backup? Becouse i didnt done it before :/
I'm looking for a way to copy my Google account, then delete it on reset or shutdown, and restore it when the phone turns back on. This is an attempt to bypass FRP locks due to rooting/recovery manipulations. This is my way of being able to use Google sync features, root, and TWRP without FRP bothering me. I didn't want to have to reflash on restart due to an update or in case the phone froze or something. I've been deleting my Google account before restarting and thought if there was a way to copy the info, delete the account, and restore it, then my phone won't turn off at boot from FRP. Is there anyway to do this? I had to post here because of low post count. I'm using the G920P on PD3 w/CF Root. I can also use PF4 as well with same root. I don't currently have TWRP on the phone, but I can put it on there.
Anybody? Is it to long of a post, or just a mess of information? It seems like a fairly easy solution to avoid FRP lock...What were the security updates in PF4 and PG1 anyway?
Thanks everyone!
First off, I have never had this problem, not sure why you would run into it.
Secondly, you can use Samsung's SideSync program to solve this. Google it or look at the videos on YouTube.
Koop have you rooted your G920P with CF Auto Root? My Knox counter is at 0x1. I had used CF Auto Root and added TWRP on PD3 and even PF4. If I have a Google account added to my accounts section and root, I will get a FRP lock when I restart the phone. That's even without TWRP. As long as one of two banks in download mode are custom, FRP is there to ruin the day. Are you not getting a FRP lock with root and/or TWRP with a Google account?? FRP lock goes away if I go into accounts and remove my Google account before shutting down or restarting the phone.
What I was asking was, is there a way to copy your Google account to somewhere, remove it from the Accounts section in the phone before restarting or shutting down through an app or from the power button, and then restore it when the phone has completely booted to avoid FRP. Running Flashfire without even flashing anything gave me custom status. I would love to have CF Auto Root and TWRP or CF Auto Root and Xposed and still be able to have a Google account in my phone.
Any other solutions? I believe I may have confused those who have read this post.
Just FYI, not only have I rooted my phone with CF-Auto-Root but I have written the tutorials on how to do it. And no, no FRP lock for me ever.
You will find if you read these forums that most people aren't experiencing any such issue. You are simply doing something wrong.
Saafir said:
I decided to use CF Autoroot after taking the latest OTA, without any issue. You haven't enabled OEM Unlocking, have you? ;p
Click to expand...
Click to collapse
Of course that is the issue. But the bigger issue is not searching the forums or even just using Google.
My tutorial here: http://forum.xda-developers.com/spr...uide-links-files-update-root-restore-t3366862
Step 4) Let your phone finish its rebooting process. Then, on your phone, go into Settings -> About Device. Scroll down to Build Number and tap that until it says "Developer mode" has been turned on. Go back to settings and you should see Developer Options. In Developer Options, make sure that OEM unlocking is turned on. It never hurts to turn that off and back on to really make SURE! Simple step that can save you a lot of grief.