Develop Bugs

[Q] Unable boot to "Download mode"

Hi every one
i got my E988 OTA update , but it fail to boot up and Show "secure booting error cause boot certification verify"
i tried many method on this forum , but it not enter "Download Mode" and detect by the PC. Please advise anything i can try?
Thank you everyone :crying:

Make sure your drivers are installed.. Take battery out and hold both volume buttons and plug in usb
2SHAYNEZ

It took me a while as well to figure out the whole 'Download Mode' thing but it became easier once I got the technique down. This is my anecdotal evidence but I dont think you need to surely have drivers installed since I plugged it into my Linux machine and it still entered download mode.
This is the method I used.
1) Turn the device completely off.
2) With one hand, Hold down both Volume arrows on the device for about 3 seconds
3) Using your other hand, plug your device into your computer. (As in, already have it plugged into USB and plug the Micro-USB port into your phone)
4) And it should show 'Download Mode' on your phone.
Hope that helps!

Thank you all bro~
 @shayneflashindaily thank you ~I have install/reinstall every Driver,and also got same..
 @GreatCaesar: i tried your method , it got same result , still show "secure booting error":crying:

maybe its a bad cable.......

[Q] (HELP) Cant Enter Download mode

I have a plan to re-flash my LGOGP E988 stock kitkat not rooted and i already downloaded the files i need but when i try to enter download mode based on what i read in all thread regarding to my unit (vol+ & vol - + usb plug into computer), thers no luck for me.. It always go to charging and not in download mode. I already installed required driversCan you help me?
Combination i tried that was no luck(usb plug in computer);
1. Off phone>remove battery>hold both volume>reinsert battery>plug micro usb
2. Off phone>hold both vol.>plug micro usb
3. Off phone>hold +vol >plug micro usb(vice versa, also use -vol)
4. Off phone> hold both vol. >Power button (go to hard reset)
5. Remove battery> hold both vol.>insert micro usb
Please help me i will update things that i already try.
Thanks in advance..
And i know thia will be benefit other members that getting hard times to enter download mode.

robtoman said:
I have a plan to re-flash my LGOGP E988 stock kitkat not rooted and i already downloaded the files i need but when i try to enter download mode based on what i read in all thread regarding to my unit (vol+ & vol - + usb plug into computer), thers no luck for me.. It always go to charging and not in download mode. Can you help me?
Combination i tried that was no luck;
1. Off phone-remove battery-hold both volume-reinsert battery-plug usb to computer
2. Off phone- hold both vol.-plug usb to computer
3. off phone- hold +vol -plug usb tomputer (vice versa alao use -vol)
4. Off phone- hold both vol. Power button (go to hard reset)
Please help me i will update things that i already try?thanks in advance..
Click to expand...
Click to collapse
Skip the reinsert battery part in your item #1:
1) Remove battery
2) Hold Volume plus and minus keys down
3) Insert USB cable while still continuing to hold down those two buttons.
WIthin 1-2 seconds you should have download mode. When download mode appears, then re-insert battery. For sure you're not going into charging mode with no battery to charge. This is the method I always use, and it always works (aside from hard-brick situations, but you can access battery charging mode/graphics, which surely means that ain't you).

not works.
culot said:
Skip the reinsert battery part in your item #1:
1) Remove battery
2) Hold Volume plus and minus keys down
3) Insert USB cable while still continuing to hold down those two buttons.
WIthin 1-2 seconds you should have download mode. When download mode appears, then re-insert battery. For sure you're not going into charging mode with no battery to charge. This is the method I always use, and it always works (aside from hard-brick situations, but you can access battery charging mode/graphics, which surely means that ain't you).
Click to expand...
Click to collapse
I realy appreciate your help but i try it several time but still not enter download mode. Just always show the boot logo of LG then off then show again the boot logo. Why am i getting this? Can anyone has their own solutions?

robtoman said:
I realy appreciate your help but i try it several time but still not enter download mode. Just always show the boot logo of LG then off then show again the boot logo. Why am i getting this? Can anyone has their own solutions?
Click to expand...
Click to collapse
What does your computer say when you plug it in? If in Windows check Device Manager and see what your phone is being recognized as. Can you access the phone's contents via USB cable from your computer? Does ADB recognize it at all? Or does it just loop like that, not starting?
Also, it sometimes takes several tries to get it into download mode, as if you're holding the buttons down and not timed just right, the phone ignore your attempt. Make sure you do not let go of both volume buttons even after you plug in the USB cable, you must continue to hold them down for a couple of seconds (until the DL mode appears). Don't even think about putting the battery back in until you see that download mode box. Try that a few times maybe? If it doesn';t work ,maybe you're boned.

robtoman said:
I realy appreciate your help but i try it several time but still not enter download mode. Just always show the boot logo of LG then off then show again the boot logo. Why am i getting this? Can anyone has their own solutions?
Click to expand...
Click to collapse
remove battery and place it again. then press both volume+ and Volume - . By keeping pressed both buttons insert your usb cable. don't release pressed buttons until its in download mood. by the way install unified adb driver for android by koush if your using windows 8.1 otherwise lg official driver is ok

Completely unable to boot to download mode

Hi, as the title says I am completely unable to boot to download mode on my E988. I have literally tried every possible combination of button pressing but nothing works. I have tried rebooting to bootloader from cwm but that doesnt work either, all it does is reboot, show the LG logo, then it reboots normally.. I have tried using terminal emulator to use the command "reboot download" but it doesnt work either, all it does is reboot, show the LG logo, then it reboots normally again. It seems that I am completely unable to access it at all. Any ideas?

Have you try with one end of the usb cord already plug in either your computer or phone, hold down both volume buttons, and plug in the other end. This was the only way down load mode would came on for me until I fixed the phone.

Yup I have. No combination of keys and button pressing seems to work for me it's odd.
Sent from my LG-E988 using XDA Free mobile app

To add on to my previous post, when I do the method whereby I hold vol + and vol - and plugging the usb cord in without my phone's battery, a message shows up when it is detected saying that a "...usb device has malfunctioned...". My phone will then just keep showing the lg logo over and over again causing the message to pop up again and again as the phone is detected and then not detected and the cycle just repeats itself. I have tried to reinstall lg drivers but nothing seems to work...
Edit: It would seem that the phone is indeed trying to boot to download mode whether I use the key combination or command, but it is unsuccessful in doing so and just reboots. Has anyone ever encountered this problem?

i can't access download mode on my lg f240l
guys please help me
i have tried to install a cwm on my lf but when i tried to restart it boots up and stopped on lg logo
i want to use flash tool i have the dll and tot file bot i can't access download mode (does not work vol + and connecting it with usb)
and when you start the power button menu and back keys blinking
Does anyone know what to do?

sllavy said:
i can't access download mode on my lg f240l
guys please help me
i have tried to install a cwm on my lf but when i tried to restart it boots up and stopped on lg logo
i want to use flash tool i have the dll and tot file bot i can't access download mode (does not work vol + and connecting it with usb)
and when you start the power button menu and back keys blinking
Does anyone know what to do?
Click to expand...
Click to collapse
i made it
1 pulled out the battery
2 press volume key up and down(at the same time)
3 plug the usb
and it worked !!!!
happy with download mode and flash tool

sllavy said:
i made it
1 pulled out the battery
2 press volume key up and down(at the same time)
3 plug the usb
and it worked !!!!
happy with download mode and flash tool
Click to expand...
Click to collapse
I have tried that at least a 100 times (I really did) but it doesnt work for me...

Me too, I'm having the same problem, I'm totally unable to get into download mode using standard methods (vol up/down, battery in, battery out etc etc)

dkusnierz said:
Me too, I'm having the same problem, I'm totally unable to get into download mode using standard methods (vol up/down, battery in, battery out etc etc)
Click to expand...
Click to collapse
I have the same problem, and I don´t know what to do. I get lost.....
I can understand why this happend. It should be a simple way to enter in download mode, but nothing results. I´m almost crazy...

Rucosta said:
I have the same problem, and I don´t know what to do. I get lost.....
I can understand why this happend. It should be a simple way to enter in download mode, but nothing results. I´m almost crazy...
Click to expand...
Click to collapse
Please help. I am stuck too... No download mode is insane

Cant enter fastboot ＆ recovery mode！

Hello，everyone,i got a problem that i cant enter fastboot and recovery mode.
today ,i installed CM12 22/7 upgrade ,and before i install this ,i did a backup of build.prop because i have V4A and every time i upgrade CM i have to change this build,prop ,so i want make a copy and when i finish upgrade i can just move that file without do anything ,and everything goes well, i installed upgrade and installed V4A driver ,it says i need restart,so i restarted,but after LG logo ,screen turn black, cant enter system ! i thought maybe i flash CM one more time can repair this,so i press POWER and volume down,but,nothing happen ,after LG logo,and screen turn black,and i try to enter fastboot mode ,its the same ,when LG logo shows screen turn black.......
My phone is LG d855,and my English is bad,i hope you can understand
Can anybody help me?

did you try entering Download mode?

Phone stuck in bootloop, help please
wrong trhead

Are you sure you there is no fastboot and no download mode?
You can enter download mode by pressing and holding the “Volume Up” and connecting the USB cable from phone to PC
If it works then you Soft bricked it...And you can use this guide to fix it:
http://forum.xda-developers.com/showthread.php?t=2785089
.
.
.
BUT if that does not work then you Hard bricked the phone
I had that problem because of flashing with faulty win8 drivers...no download mode or fastboot, all i got was security warning and bootloop. The only way you can fix hardbrick is through JTag, but i don't know if you can fix it without paying someone money, because you need special hardware to do it. You can find people on ebay that can fix it but it will cost you 30-50$.
I sent mine to warranty...they didn't know what was wrong with it and couldn't fix it...and so they just replaced the motherboard. If you have a warranty then send it and do NOT!! tell them you flashed it or rooted it. Tell them you don't know what happened...The chances of them finding out is very small.
If ebay and/or warranty not work, then there was an article on the Internet to fix a hard brick but for some reason it is now password protected...i do not know why....You can send the owner an email so he can give you the password.
http://www.androidbrick.com/unbrick-recover-your-dead-lg-g3-g2-all-variants
...There is another article but it is in Portuguese
http://arena4g.com/forums/topic/tutorialunbrickhard-unbrickd855
But then again you cant be certain this will work either.
Conclusion: Fk LG...They don't want people upgrading their slow buggy software.

Alex_XV6700 said:
did you try entering Download mode?
Click to expand...
Click to collapse
i cant enter download mode,always turn black after LG logo

Disconnect cable from pc and phone
Press power + vol -
You will get first black screen, keep pressing until lg logo appears and it shuts off completely.
Then press just vol + and reconnect cable to computer.
That should leave you in download mode or fastboot.

Alex_XV6700 said:
Disconnect cable from pc and phone
Press power + vol -
You will get first black screen, keep pressing until lg logo appears and it shuts off completely.
Then press just vol + and reconnect cable to computer.
That should leave you in download mode or fastboot.
Click to expand...
Click to collapse
no,when i reconnect phone,and only press volume + ,its shows i am Charging then phone is off.......cant enter download mode,but i found when i press volume +and- , i can enter hardware key control mode,but there only have 3 choice,cancel , mode on and mode off,i have tried mode on and mode off,doesnt work.

rubisco1 said:
Are you sure you there is no fastboot and no download mode?
You can enter download mode by pressing and holding the “Volume Up” and connecting the USB cable from phone to PC
If it works then you Soft bricked it...And you can use this guide to fix it:
http://forum.xda-developers.com/showthread.php?t=2785089
.
.
.
BUT if that does not work then you Hard bricked the phone
I had that problem because of flashing with faulty win8 drivers...no download mode or fastboot, all i got was security warning and bootloop. The only way you can fix hardbrick is through JTag, but i don't know if you can fix it without paying someone money, because you need special hardware to do it. You can find people on ebay that can fix it but it will cost you 30-50$.
I sent mine to warranty...they didn't know what was wrong with it and couldn't fix it...and so they just replaced the motherboard. If you have a warranty then send it and do NOT!! tell them you flashed it or rooted it. Tell them you don't know what happened...The chances of them finding out is very small.
If ebay and/or warranty not work, then there was an article on the Internet to fix a hard brick but for some reason it is now password protected...i do not know why....You can send the owner an email so he can give you the password.
http://www.androidbrick.com/unbrick-recover-your-dead-lg-g3-g2-all-variants
...There is another article but it is in Portuguese
http://arena4g.com/forums/topic/tutorialunbrickhard-unbrickd855
But then again you cant be certain this will work either.
Conclusion: Fk LG...They don't want people upgrading their slow buggy software.
Click to expand...
Click to collapse
thx for your reply. i tried many times with different way,try to enter download mode or fastboot .......but failed.and now i decided buy Nexus 6

[Q] Please help with BootLoop after screen replecement

So i had a cracked screen, ordered a new one of aliexpress. Exchanged it, turned on the phone and got the boot loop.
I read that exchanging the screen acts like a new hardware ID and this is why i get the LOOP.
So i wanted to turn off the cores:
- installed drivers from LG.com
- used original cable
I hold the volume up button, plug the phone and still get to the boot loop. No download mode. How could my download mode be erased if i changed the screen?
I also sent the phone into warranty but they said because i exchanged the screen they will not fix the boot loop!!! LG are a bunch of assholes but that is a story for another time.
If you can think of something regarding to how i can get into Download Mode, please let me know
Thank you
UPDATE: I changed the cable and now the download mode icon appears and after 3 seconds the phone resets and download mode appears again (if i keep pressing vol up) and so on.. It does not actually enter the download mode.

is there any way to force bootloop???? with a kdz file or changing something with root permision ??? i need to send my phone to the SAT