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Flash CM13 with locked bootloader

Hello guys.
I'm really waiting for lg's bootloader unlock support for TWN version, but I got a question about that.
If I root my phone and using flashfy, can I flash CM13 with locked bootloader?

It wouldnt flash it would probably would brick your device and i wouldnt recommend it, Its an unsigned zip so yeah but trying to get safestrap on this thing would be nice

subkm said:
Hello guys.
I'm really waiting for lg's bootloader unlock support for TWN version, but I got a question about that.
If I root my phone and using flashfy, can I flash CM13 with locked bootloader?
Click to expand...
Click to collapse
Better don't do it, consquences may be very ugly.

How to pass LG G4 Marshmallow to CM13 or another custom ROM?

Hello, has passed a lot of time since my last thread. This time, I'm requesting your help about something that every time I read a related thread turns more complicated.
I just want to know if I can flash CyanogenMod 13 or another custom ROM if I have an LG G4 with official Android Marshmallow V20c (not rooted and with locked bootloader, because I don't know if I can take the risk), because I learned how to root and unlock the bootloader, but for example, CM13 needs a V20a stock ROM and when I flashed that version with LGUP I didn't have signal and com.android.process wasn't working.
I hope you can give me a vision, very easy to understand, because the threads are not very explicit.
Thanks and regards!

chrisdlc119 said:
Hello, has passed a lot of time since my last thread. This time, I'm requesting your help about something that every time I read a related thread turns more complicated.
I just want to know if I can flash CyanogenMod 13 or another custom ROM if I have an LG G4 with official Android Marshmallow V20c (not rooted and with locked bootloader, because I don't know if I can take the risk), because I learned how to root and unlock the bootloader, but for example, CM13 needs a V20a stock ROM and when I flashed that version with LGUP I didn't have signal and com.android.process wasn't working.
I hope you can give me a vision, very easy to understand, because the threads are not very explicit.
Thanks and regards!
Click to expand...
Click to collapse
As simple as possible: no!
With MM and locked BL you can't get root and you can't install any custom Rom.

Jens1969 said:
As simple as possible: no!
With MM and locked BL you can't get root and you can't install any custom Rom.
Click to expand...
Click to collapse
You don't understand me. I know how to unlock my bootloader and after that root my phone, but I'm not taking the risk because I flashed the V20A stock ROM to install CM13, but I didn't have cellular signal and because that I didn't try to unlock and root my phone.
Maybe this question is more useful: Can I install CM13 when I have a V20C stock ROM and not the V20A one?
Thanks and regards.

You can flash any custom rom if you have unlocked bootloader and custom recovery e.g. TWRP. Without that things you can't flash anything, because custom roms needs unlocked bootloader.

adamz667 said:
You can flash any custom rom if you have unlocked bootloader and custom recovery e.g. TWRP. Without that things you can't flash anything, because custom roms needs unlocked bootloader.
Click to expand...
Click to collapse
OK, now I understand that I can flash CM13 over V20C and not necessarily over V20A.
Enviado desde mi LG-H815 mediante Tapatalk

You can flash CM13 on any V20... (V10 being LP, V20 MM) as long as you have a MM base you can flash. However, as said above, you MUST unlock bootloader to flash CM, don't try and flash custom ROM without unlocked bootloader. You can unlock bootloader on any version as long as yours is one of the models with the ability.

Question: Bootloader status and root for M

It may be a stupid question but I found 1 thing, about the bootloader, confusing:
When the M beta was released in the dedicated thread was written that the updating process to M locks the bootloader.
Now that M is released to root it we have to update from L to M and then fastboot boot twrp.img and apparently this command requires an unlocked bootloader (I've read this in a nexus thread).
The question is: if the update locks the bootloader how comes we need to unlock it in L?
What is the difference between a locked phone updated from L to M and a phone unlocked in L and then updated to M? Shouldn't both the phones have a locked bootloader?
TiA
Sent from my ASUS_Z008D

Fastboot FLASH twrp requires an unlocked bootloader (that's installing permanent twrp) fastboot BOOT twrp (tethered twrp) does not.
Sent from my ASUS_Z00A using Tapatalk

I know that, but the command doesn't say flash, it says boot, so it's like (or at least it looks like) the tethered recovery we're using for L. Yet they say to unlock before updating, or downgrade + unlock + upgrade.
Sent from my ASUS_Z008D

Ah, I misread your post. That actually is a good question!
Sent from my ASUS_Z00A using Tapatalk

Yes i also wondered why too(unlocked bootloader in L) but that was in description to have unlocked bootloader in L before flashing beta 6 MM to gain root or the script wouldnt work.
Not too sure if this is the same with new official MM maybe someone can explain more ?

I was about to ask the exact same question. Shakalaca method for rooting (Unlocked L > MM upgrade > root + xposed through tethered TWRP) ends up with a LOCKED bootloader (he say so in OP). This method works for OFFICIAL BETA (4.21.40.61).
Quang Boom's rooting video ends up with MM root and UNLOCKED bootloader.
Do Shakalaca's method works with OFFICIAL FINAL MM (i.e. 4.21.40.134)? Some say yes, others say no. I'm confused.

And a lot of people are saying they succeeded with a locked bl
Sent from my ASUS_Z008D

distant_thunder_89 said:
Quang Boom's rooting video ends up with MM root and UNLOCKED bootloader.
Click to expand...
Click to collapse
Can you post the link for this video? Thanks.

I unlocked the official mm with quang booms files he linked in YouTube, rooting is then possible with his signed twrp...
https://youtu.be/fDls4gLyusY

Guys, after some research I came to the conclusion that is not possible in MM to have both root and a locked BL.
I decided to upgrade nonetheless, if some issue arise which would require RMA we can always downgrade and use the LP relock to get warranty back (the LP relock is in the asus forum).

TheSSJ said:
I unlocked the official mm with quang booms files he linked in YouTube, rooting is then possible with his signed twrp...
Click to expand...
Click to collapse
Well this dude just made a video of himself using shakalaka's method for the beta (unlock android beta by shakalaka, 3d by samcjtsai), I just confronted the hashes for the files you can download from the YouTube page with those for the files from that 3d and they are the same, same method, same files.
But let's not make this a "how to root post", there's plenty of informations on here.
I'm just interested in the bootloader thing, if someone can explain.
Sent from my ASUS_Z008D

how to check if my bootloader is unlocked?

i got asus zenfone 2 ww.194 z00a

maor23 said:
i got asus zenfone 2 ww.194 z00a
Click to expand...
Click to collapse
Assuming that you unlock the bootloader, root the phone and change the splash screen....
Reboot the phone.....
If Asus logo splash screen is black your bootloader is locked.
If Asus logo splash screen is white your bootloader is unlocked.

sway8966 said:
Assuming that you unlock the bootloader, root the phone and change the splash screen....
Reboot the phone.....
If Asus logo splash screen is black your bootloader is locked.
If Asus logo splash screen is white your bootloader is unlocked.
Click to expand...
Click to collapse
is black
so i do i unlock the bootloader?

maor23 said:
is black
so i do i unlock the bootloader?
Click to expand...
Click to collapse
Why do you want to unlock the bootloader?
For the time being, there is no way to unlock the bootloader in MM. May be in the near future.
If you want to unlock the bootloader in MM, you need to temporarily downgrade the bootloader to Lollipop, unlock the bootloader and upgrade back to MM by the patched bootloader.

sway8966 said:
Why do you want to unlock the bootloader?
For the time being, there is no way to unlock the bootloader in MM. May be in the near future.
If you want to unlock the bootloader in MM, you need to temporarily downgrade the bootloader to Lollipop, unlock the bootloader and upgrade back to MM by the patched bootloader.
Click to expand...
Click to collapse
i understood that if i want to upgrate to MM from LP i need a twrp and unlocked bootloader no?

maor23 said:
i understood that if i want to upgrate to MM from LP i need a twrp and unlocked bootloader no?
Click to expand...
Click to collapse
Yes

maor23 said:
i understood that if i want to upgrate to MM from LP i need a twrp and unlocked bootloader no?
Click to expand...
Click to collapse
No.
To upgrade to MM from LP your firmware has to be at least 184.
You can use OTA or download the MM from ASUS site and install the MM in ADB environment with adb sideload command.
Do not upgrade MM via TWRP. MM install package does not compatible with TWRP. However, there is guide to modified the installation script in order to work with TWRP. The guide was written a year ago for Lollipop .
If your intention is to use custom rom in MM then you need an unlocked bootloader with custom recovery like TWRP.
In that case you need to unlock the bootloader in lollipop before you upgrade to MM. Like I said, there is no direct way to unlock bootloader in MM.
If your intention is to have rooted MM, then you do not need to unlock the bootloader.
You do not need to install the TWRP. You can use tethered TWRP to flash the super su zip file.

sway8966 said:
No.
To upgrade to MM from LP your firmware has to be at least 184.
You can use OTA or download the MM from ASUS site and install the MM in ADB environment with adb sideload command.
Do not upgrade MM via TWRP. MM install package does not compatible with TWRP. However, there is guide to modified the installation script in order to work with TWRP. The guide was written a year ago for Lollipop .
If your intention is to use custom rom in MM then you need an unlocked bootloader with custom recovery like TWRP.
In that case you need to unlock the bootloader in lollipop before you upgrade to MM. Like I said, there is no direct way to unlock bootloader in MM.
If your intention is to have rooted MM, then you do not need to unlock the bootloader.
You do not need to install the TWRP. You can use tethered TWRP to flash the super su zip file.
Click to expand...
Click to collapse
hey man, thanks for the answer.
i did succsessfuly upgrade to MM, but i cant now root my phone..
do you know how can i root my phone

maor23 said:
hey man, thanks for the answer.
i did succsessfuly upgrade to MM, but i cant now root my phone..
do you know how can i root my phone
Click to expand...
Click to collapse
I answered your question in the other post.

Help me what to do with my new phone!

Hi everyone, I have a bit of experience with flashing roms to android phones from the past and I'm coming from an LG G3 that has Lineage OS installed on it.
What I'm looking to do is to get Lineage installed on my HTC 10, I picked it up the other day and it came shipped with Android 7.0 Nougat installed. I haven't got a clue what to do first just in case anything goes wrong.
So my questions are:
How do I unlock the bootloader and is there anything I need to do first? (What is S-Off?)
Can I flash TWRP without rooting the device to just nandroid backup?
How do I go from Stock rom to LineageOS via flashing? Is it just as simple as wiping system etc and flashing in twrp?

I'd urge you to read a lot more before jumping into this because your questions suggest you're really not aware of what you're doing. It helps to comprehend what each of these terms and actions means before you pull the trigger.
Check the 'development' section for how to unlock
S-Off enables you to update firmware separate from ROMs
No, you need to unlock the bootloader to be able to flash TWRP
Once you have unlocked the bootloader and flashed TWRP then yes, flashing a ROM is as easy, but referring to S-Off, you'll need to be sure that your firmware is compatible with the ROM of your choice; if not, you'll have to flash that separately.
Really. Read up. Check these guides first.
https://forum.xda-developers.com/htc-10/how-to/stock-stock-collection-recovery-ruu-ota-t3359297
https://forum.xda-developers.com/htc-10/how-to/guide-root-optionally-s-off-radio-t3373025

BillTheCat said:
I'd urge you to read a lot more before jumping into this because your questions suggest you're really not aware of what you're doing. It helps to comprehend what each of these terms and actions means before you pull the trigger.
Check the 'development' section for how to unlock
S-Off enables you to update firmware separate from ROMs
No, you need to unlock the bootloader to be able to flash TWRP
Once you have unlocked the bootloader and flashed TWRP then yes, flashing a ROM is as easy, but referring to S-Off, you'll need to be sure that your firmware is compatible with the ROM of your choice; if not, you'll have to flash that separately.
Really. Read up. Check these guides first.
https://forum.xda-developers.com/htc-10/how-to/stock-stock-collection-recovery-ruu-ota-t3359297
https://forum.xda-developers.com/htc-10/how-to/guide-root-optionally-s-off-radio-t3373025
Click to expand...
Click to collapse
I know my fair share of android modifications and have done so in the past. It's just this is the most ive ever spent on a phone and I dont want to mess it up firstly. I've even compiled roms of my own in the past as you can see from my signature.

johnnzey said:
I know my fair share of android modifications and have done so in the past. It's just this is the most ive ever spent on a phone and I dont want to mess it up firstly. I've even compiled roms of my own in the past as you can see from my signature.
Click to expand...
Click to collapse
Then you have nothing to worry about... flash away!
Sent from my HTC 10 using Tapatalk

BillTheCat said:
Then you have nothing to worry about... flash away!
Sent from my HTC 10 using Tapatalk
Click to expand...
Click to collapse
So, it's oem unlock, twrp, backup, and flash away? Reading up on S-off, it only seems useful for those that are doing really specific modding. I just want the ability to either root or flash custom roms so the bootloader unlock should do me fine right?

johnnzey said:
So, it's oem unlock, twrp, backup, and flash away? Reading up on S-off, it only seems useful for those that are doing really specific modding. I just want the ability to either root or flash custom roms so the bootloader unlock should do me fine right?
Click to expand...
Click to collapse
Backup your files (pictures, music etc) first, bootloader unlocking wipes your device

johnnzey said:
So, it's oem unlock, twrp, backup, and flash away? Reading up on S-off, it only seems useful for those that are doing really specific modding. I just want the ability to either root or flash custom roms so the bootloader unlock should do me fine right?
Click to expand...
Click to collapse
Yes, but if you want to flash a custom ROM not supported by your current firmware version, S-off will be necessary.
Sent from my HTC 10 using Tapatalk

How do I know if a rom doesn't support my firmware version? Is that like flashing a CDMA ROM to a GSM phone (that level of difference) ?
Or is it like converting carrier firmware to stock HTC firmware?

johnnzey said:
How do I know if a rom doesn't support my firmware version? Is that like flashing a CDMA ROM to a GSM phone (that level of difference) ?
Or is it like converting carrier firmware to stock HTC firmware?
Click to expand...
Click to collapse
Just check in the thread for the rom you want, installation requirements are usually listed there.