D800-20u Update (Knock Code update)

Search This thread
By:
Advanced…
J

jasona801

Member
Jul 6, 2011
31
6
big mistake

So I am a dummy. First off, I am rooted on 4.4.2 with a twrp recovery. Update notified me and I instinctively clicked on it. After that I was in a recovery bootloop. Rather than taking it slow and reading here for the way to get it out of that I wiped the device. Unfortunately I also clicked wipe system and now I have no files on my device at all and still am in a recovery bootloop. Where do I go from here? Please help me out and my infinite stupidness.
 
S

Sj12345

Senior Member
May 22, 2012
346
203
Bakersfield
daryelv said:
Like this...

Code: 
adb shell
dd if=/dev/block/platform/msm_sdcc.1/by-name/fota of=/sdcard/fota-backup.img
dd if=/dev/zero of=/dev/block/platform/msm_sdcc.1/by-name/fota

-Daryel
Click to expand...
Click to collapse

Sorry, I still have problem with the adb connection, my pc don't recognize the phone, under devices manager I see other devices > LG-d800

Edit: I installed the sdk and LG drivers, so I go to advance > adb sideload and slip in the next screen (twrp) but when type adb devices it doesn't show anything

Edit 2: got it, thank for the code, now it's working again

Sent from my KFTHWI using Tapatalk
 
Last edited:
M

mjones73

Senior Member
Apr 5, 2010
3,577
927
North East, MD
M

mjones73

Senior Member
Apr 5, 2010
3,577
927
North East, MD
gorillajuice

gorillajuice

Senior Member
Jul 9, 2011
163
51
If you want to root and keep knock code you can flash Dorimanx's 4.7 kernel until a dev realeases a fix for us. I just rooted using ioroot, transfer kernel file to phone, lokify using autorec, boot into recovery and flash Dorimanx 4.7. Once you reboot you can check knock code is working, I have double tap and knock code working at the same time I don't know if this is supposed to happen or not.
 
C

crc301

Member
Dec 18, 2010
10
2
mjones73 said:
Seems to be a wide spread issue on LG KK roms where playback stops randomly with error. I suffer from it on my VS980 on any LG KK based rom.

http://forums.androidcentral.com/sprint-lg-g2/379544-sprint-lg-g2-google-play-music-issue.html

https://community.verizonwireless.com/thread/823754
Click to expand...
Click to collapse

Oh wow. I have never seen that issue. 90% of my listening is in the 'On Device' mode through a pair of LG Tone+ Bluetooth headphones. The other 10% is through in the 'On Device' mode with a pair of wired headphones. I have never seen issue while listening (knock on wood!). Could this be a problem only when 'streaming' music through Google Play (either your own library or All Access)?
 
M

mjones73

Senior Member
Apr 5, 2010
3,577
927
North East, MD
crc301 said:
Oh wow. I have never seen that issue. 90% of my listening is in the 'On Device' mode through a pair of LG Tone+ Bluetooth headphones. The other 10% is through in the 'On Device' mode with a pair of wired headphones. I have never seen issue while listening (knock on wood!). Could this be a problem only when 'streaming' music through Google Play (either your own library or All Access)?
Click to expand...
Click to collapse

I do believe it's a streaming issues vs playing back cached music.
 
D

DaemonAshra

Senior Member
Oct 17, 2009
300
81
35
Mesa
Is there a way to install this update through fastboot or anything. My phone is unlocked and can't get software updates through the settings menu.
 
D

dxp2_sw

Member
Apr 8, 2014
16
6
I rooted on 4.2.2 updated to 4.4.1 and then came into my phone updating to 4.4.2 automatically. I'm still rooted and haven't encountered any issues. I am on a stock recovery and stock room minus the AT&T bloatware. I wasn't going to take the 4.4.2 update but it happened anyway. Knock code is intriguing but nothing I would be willing to lose root for. Luckily I get them both. Woo!

Sent from my LG-D800 using Tapatalk
 
powerwagon

powerwagon

Senior Member
Jun 6, 2010
747
270
Towelroot let's you root the latest update...took all of 20 secs

Sent from my LG-D800 using Tapatalk
 
N

nicklite97

Member
Jun 20, 2014
26
3
powerwagon said:
Towelroot let's you root the latest update...took all of 20 secs

Sent from my LG-D800 using Tapatalk
Click to expand...
Click to collapse


Hi I need help with my G2 the d800 I had the knock code update and reflashed my phone back to D80020c 4.4 and installed Autorec and installed it then I installed a custom rom didnt like it then I went back to D80020c 4.4 now my knock on is not working but knock off works how to fix it?
 
jdk2

jdk2

Senior Member
Feb 7, 2010
425
162
Southport, NC
Samsung Galaxy S23 Ultra
nicklite97 said:
Hi I need help with my G2 the d800 I had the knock code update and reflashed my phone back to D80020c 4.4 and installed Autorec and installed it then I installed a custom rom didnt like it then I went back to D80020c 4.4 now my knock on is not working but knock off works how to fix it?
Click to expand...
Click to collapse
Go here: http://xdaforums.com/showpost.php?p=50664059&postcount=1
Grab the "Download Installer - KitKat 4.4.2 D80020c". That will put you on stock D80020c. Then update your software OTA. Then you can root, add recovery etc.

I should mention when you flash .tot files, it seems better to remove your sim card while doing so to avoid the "Your phone is not registered" message when trying to get the OTA. Flashing the .tot files seems to ruin the sim card in some cases. I don't even replace the sim until the update has finished and the phone reboots.
 
Last edited:
  • Like
Reactions: Monticlair22
S

sansart

Senior Member
Jul 16, 2010
80
8
I'm on D80020k with root and recovery. Is it currently possible to get the D80020u update and keep root and recovery (and keep knock code working)?
 
daraj

daraj

Senior Member
Jun 21, 2007
1,751
237
Florida, USA
nicklite97 said:
Hi I need help with my G2 the d800 I had the knock code update and reflashed my phone back to D80020c 4.4 and installed Autorec and installed it then I installed a custom rom didnt like it then I went back to D80020c 4.4 now my knock on is not working but knock off works how to fix it?
Click to expand...
Click to collapse

or you can fix it the easy way by going to 38453#*800# then settings then update touch firmware.
That worked for me
 
B

bigant262

Senior Member
May 12, 2009
1,106
190
Anyone create a zip file for us to flash to get the latest firmware? I'd much rather have the stock ATT firmware then CloudyStock or Cloudyflex.
 
You must log in or register to reply here.

Similar threads

AndroidUser00110001
[ROM] CyanogenMod OFFICIAL NIGHTLIES - 4.4 - CM11 - D800
Replies
2K
Views
251K
S
swetz
E
  • Sticky
[GUIDE]Newbie Guide for Root/Recovery/Stock Restore etc. ATT LG G2 (LG D800)
Replies
245
Views
164K
E
epapsiou
D
  • Poll
[ROM][5.0.2][CM12][D800] Official CyanogenMod12 on LG G2 D800
Replies
224
Views
79K
D
dr4stic
AndroidUser00110001
  • Locked
[ROM] D800 KitKat Manual Update with Root
Replies
205
Views
44K
AndroidUser00110001
AndroidUser00110001
xaueious
Update to Official KitKat 20y, no AT&T OTA Push needed, Root required
Replies
135
Views
90K
Alih953
Alih953

Top Liked Posts

24 Hours All time
  • There are no posts matching your filters.
  • 1
    daryelv
    daryelv
    Here's the files from the update... not much we can do with them though...

    http://www.androidfilehost.com/?fid=23501681358545806


    Edit: I was on 800-20k with a custom recovery (autorec) installed. Taking the update will put you in a "recovery" bootloop. I was able to get out of the bootloop by nulling out the fota partition.

    I reflashed the 800-20c TOT file using LGFlashtool and then went and did a software update. It downloads both 20k and 20u updates and applies them both. Afterwards I rooted using autoprime's ioroot25r1 tool (adb sideload method).

    Because there is a new kernel to support knock-code, do NOT flash a recovery using autorec or anything that will affect the kernel until a developer gets their hands on it and inserts the older bootloader.

    -Daryel
    View
    1
    daryelv
    daryelv
    RS7JR said:
    Just got this notification. Anybody know if there's anything important or significant with this?

    Sent from my LG-D800 using Tapatalk 4
    Click to expand...
    Click to collapse

    The only difference I see is knock-code.

    Good news is that ioroot25 still works on it.

    -Daryel
    View
    1
    spdwiz18
    spdwiz18
    xbxjunkie said:
    so, do you lose root after this update? i'm rooted with no custom recovery
    Click to expand...
    Click to collapse

    ota should error out, mine did, i tried twice.
    View
    1
    C
    crc301
    daryelv said:
    The only difference I see is knock-code.

    Good news is that ioroot25 still works on it.

    -Daryel
    Click to expand...
    Click to collapse

    Here's AT&T's update page that has some info: http://www.att.com/esupport/article.jsp?sid=KB423381&cv=820#fbid=9EhTGDbrWCI

    Software update includes:

    • Knock Code" security feature
    • Calendar/ Exchange Active Sync (EAS) enhancements
    I've also noticed that Album Art for music playing in Google Music now takes up the entire lock screen; the previous release only displayed in a little box at the top.
    View
    1
    jdk2
    jdk2
    nicklite97 said:
    Hi I need help with my G2 the d800 I had the knock code update and reflashed my phone back to D80020c 4.4 and installed Autorec and installed it then I installed a custom rom didnt like it then I went back to D80020c 4.4 now my knock on is not working but knock off works how to fix it?
    Click to expand...
    Click to collapse
    Go here: http://xdaforums.com/showpost.php?p=50664059&postcount=1
    Grab the "Download Installer - KitKat 4.4.2 D80020c". That will put you on stock D80020c. Then update your software OTA. Then you can root, add recovery etc.

    I should mention when you flash .tot files, it seems better to remove your sim card while doing so to avoid the "Your phone is not registered" message when trying to get the OTA. Flashing the .tot files seems to ruin the sim card in some cases. I don't even replace the sim until the update has finished and the phone reboots.
    View

New posts