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[BOOTLOADER] 2nd-bootloader for Custom ROMs on KFireHD 7" [06/24 CM12.1/TWRP 2.8.7.0]

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Hashcode

Senior Recognized Developer
Sep 3, 2011
3,426
23,731
[BOOTLOADER] 2nd-bootloader for Custom ROMs on KFireHD 7" [06/24 CM12.1/TWRP 2.8.7.0]

Introducing: Kindle Fire 2nd-bootloader + TWRP 2.8.x.x for the Kindle Fire HD 7

*** USE AT YOUR OWN RISK! WHILE I TRY MY BEST TO PROVIDE WORKING KERNELS/ROMS, I AM NOT RESPONSIBLE IF THIS SOFTWARE OR ANYTHING I'VE WORKED ON SUDDENLY FRIES YOUR DEVICE. ***

** THESE FILES WILL ONLY WORK ON A KINDLE FIRE HD 7 **

** WHEN MODDING THE KFIRE HD YOU SHOULD HAVE WORKING FASTBOOT DRIVERS/ACCESS ON YOUR PC. **


LOOKS LIKE NOT ALL FASTBOOT CABLES WILL AUTOMATICALLY PLACE YOU IN FASTBOOT MODE ON THE KINDLE FIRE HD 7. DOWNLOAD THE ANDROID SDK AND GO FROM THERE.
http://developer.android.com/sdk/index.html

Here's 1 website you can purchase a FASTBOOT adapter from (works with your normal USB cable)
http://shop.teamblackhat.info/Factory-Adapters-motadapt.htm
** I don't make any commission or fee from the sales of these devices, I just know they have them on stock most of the time and ship in a reasonable time frame unlike the Chinese variants found on ebay.

Q: How do I know if my fastboot works?
A: With the Kindle powered down, type the following command into a cmd/terminal window on your PC (should return with: < waiting for device> ):
fastboot -i 0x1949 getvar product

Then connect your fastboot cable to the Kindle and reboot. It *SHOULD* show a Fastboot screen and your terminal window should show something like:
product: Tate-XXX-XX (something here)

Type this to reboot out of fastboot mode:
fastboot -i 0x1949 reboot


** IF YOU HAVE QUESTIONS, RE-READ THROUGH THE THREAD FOR ANSWERS. WHEN YOU'RE ABSOLUTELY SURE NO ONE HAS ASKED YOUR QUESTION, GO AHEAD AND RE-READ THE THREAD AGAIN AND USE THE SEARCH FEATURE. THEN POST YOUR QUESTION IF YOU STILL CAN'T FIND THE ANSWER **



INSTRUCTIONS FOR INSTALLING A 2ND-BOOTLOADER TO LOAD CUSTOM KERNELS / ROMS / RECOVERY:
*** BE SURE YOU HAVE A GOOD CHARGE ON THE DEVICE ***

STEP 1. Backup your stock partitions to your own HD for later if you need disaster recovery:
Code:
adb shell su -c "dd if=/dev/block/mmcblk0boot0 of=/sdcard/boot0block.img"
adb shell su -c "dd if=/dev/block/platform/omap/omap_hsmmc.1/by-name/boot of=/sdcard/stock-boot.img"
adb shell su -c "dd if=/dev/block/platform/omap/omap_hsmmc.1/by-name/recovery of=/sdcard/stock-recovery.img"
adb shell su -c "dd if=/dev/block/platform/omap/omap_hsmmc.1/by-name/system of=/sdcard/stock-system.img" # This will take a few minutes
adb pull /sdcard/boot0block.img
adb pull /sdcard/stock-boot.img
adb pull /sdcard/stock-recovery.img
adb pull /sdcard/stock-system.img # This will take a few minutes
Take those files and put them somewhere safe.

**** MAC USERS MAY NEED TO SPARSE THE FILES FOR RE-FLASHING TO THE DEVICE. I NEED A MAC USER TO PROBABLY WORK THROUGH THAT PROCESS AND POST BACKUP COPIES OF THE STOCK PARTITIONS FOR DISASTER RECOVERY ****


STEP 2: Download the files you will need to install 2nd-bootloader, TWRP and CM:

ON THE FOLLOWING DEV-HOST LINKS
USE THE BLUE "DOWNLOAD NOW" BUTTON
-- DO NOT INSTALL AN EXECUTABLE DOWNLOADER TO YOUR SYSTEM! --
I'LL LOOK FOR A BETTER HOST WHEN I GET MORE TIME.

  1. Stack override file:
    Mirror 1: Download "stack" from Dev-Host
  2. [12/09] kfhd7-freedom-boot-7.4.6.img (USED ONLY THE FIRST TIME -- .zip files will have their own boot.img's from now on):
    Mirror 1: Download "kfhd7-freedom-boot-7.4.6.img" from Dev-Host
    md5sum: 1628fc4750d0d49cbce41ab616a9d732
  3. [06/24] TWRP 2.8.7.0 recovery flash Image:
    Mirror 1: Download TWRP from Dev-Host
  4. CM-12.1 for the Kindle Fire HD 7 (choose the latest version from):
    Mirror 1: Downloads CM
  5. Google Apps from Android File Host:
    https://www.androidfilehost.com/?w=files&flid=25361 (Use 5.1 version!)
  6. Download the older 7.2.3 bootloader file and flash to your device via fastboot:
    Mirror 1: Download bootloader from Dev-Host
    md5sum bb029673d8f186db4dff6d38f4aa28cf
    (You SHOULD check the md5sum before using fastboot -- downloads CAN be corrupted)
Place the CM-12.1 ROM and the gapps .zip on your device in the /sdcard area


STEP 3. Install the stack override in /system:
ADB commands entered while booted up into STOCK *rooted* Amazon Kindle OS -- May need to enable ADB debugging in Settings:
[2013-08-21] edited the location where stack is placed on device due to permissions changes
Code:
adb push stack /sdcard/
adb shell su -c "dd if=/sdcard/stack of=/dev/block/platform/omap/omap_hsmmc.1/by-name/system bs=6519488 seek=1"

STEP 4. Stop the auto recovery update script (this file may or may not be present):
Code:
adb shell su -c "mount -o remount,rw ext4 /system"
adb shell su -c "mv /system/etc/install-recovery.sh /system/etc/install-recovery.sh.bak"
adb shell su -c "mount -o remount,ro ext4 /system"


STEP 5:
[ With the device powered off: connect your FASTBOOT USB cable to the Kindle which should cause it to power on and enter "FASTBOOT" mode. Issue the following commands into your command/terminal window on your PC 1 at a time. ]

Code:
fastboot -i 0x1949 flash bootloader kfhd7-u-boot-prod-7.2.3.bin
fastboot -i 0x1949 flash boot kfhd7-freedom-boot-7.4.6.img
fastboot -i 0x1949 flash recovery kfhd7-twrp-2.8.7.0-recovery.img
fastboot -i 0x1949 reboot

*DONT RE-FLASH FREEDOM-BOOT.IMG LATER AFTER FLASHING CUSTOM ROMS -- IT'S FOR STOCK AMAZON OS ONLY / FIRST INSTALL ONLY*

** If everything was done correctly your Kindle will reboot and you will at first see the normal Kindle Fire ORANGE logo and then it will fade and come back as a BLUE logo. **

TO ENTER RECOVERY:
Press the left volume button (volume up) while the logo is still YELLOW and keep pressing until the logo turns BLUE. Wait a moment and you should enter recovery.


STEP 6:
CM-12.1 AND GAPPS INSTALLATION:
  • (OPTIONAL) Make a backup by selecting "Backup" and then slide your finger to the right on the "Swipe to Back Up"
  • Once complete use the pentagon "Home" icon in the lower left corner of the screen
  • Now, select "Wipe"
  • Swipe the "Swipe to Factory Reset"
  • Use the "Home" icon
  • Select "Install"
  • Browse to the location on your device where you saved the CM-12.1 / GAPPS .ZIP files
  • Select the CM12.1 ZIP file in the list by touching it, then confirm it says the name of the CM-12.1 .ZIP file on the next screen under "File to flash:"
  • Select "Add More Zips"
  • Select the GAPPS ZIP file in the list by touching it -- make sure it says the name of the .ZIP again under "File to flash:"
  • Swipe the "Swipe to Confirm Flash", and wait for it to finish.
  • If the screen is blank at any time you can hit the power button to "wake up" the device
  • Once the flash is done, you'll see a "Home" and "Reboot" buttons at the bottom of the screen
  • Select "Reboot"

CONGRATULATIONS YOU NOW HAVE THE ABILITY TO INSTALL CUSTOM KERNELS / RECOVERY AND ROMS.


FLASHING BACK TO STOCK:
** FIND THE FILES WE BACKED UP IN STEP #1: ** OR Follow this thread's instructions:
http://forum.xda-developers.com/showthread.php?t=1951254

**** MAC USERS MAY NEED TO SPARSE THE FILES FOR RE-FLASHING TO THE DEVICE. I NEED A MAC USER TO PROBABLY WORK THROUGH THAT PROCESS AND POST BACKUP COPIES OF THE STOCK PARTITIONS FOR DISASTER RECOVERY ****

Plug in your fastboot cable and reboot so that you see the fastboot screen. On your computer go into a prompt and change to the directory where your stock backups are and enter the following commands:
Code:
fastboot -i 0x1949 flash boot [B]stock-boot.img[/B]
fastboot -i 0x1949 flash recovery [B]stock-recovery.img[/B]
fastboot -i 0x1949 flash system [B]stock-system.img[/B] # This one will take a few minutes
fastboot -i 0x1949 reboot


THANKS TO:
  • fattire for finding the original bootloader exploit
  • verygreen for doing some initial work on the 2nd-bootloader and fixing bugs (and letting me copy some of his bootloader installation instructions)
 

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Hashcode

Senior Recognized Developer
Sep 3, 2011
3,426
23,731
Changelog: updated 2013-07-08

freedom boot.img (for use w/ stock Amazon OS + 2nd-bootloader):
  • [07/08] Updated w/ kernel from 7.4.3 release

Amazon OS .zip:
  • [07/08] Rebuilt on version 7.4.3 from Amazon

TeamWin Recovery (TWRP) 2.6.0.0

  • [*][07/08] USB Vendor ID / Product ID in recovery now matches stock Amazon OS
  • [07/08] Fixed long pause before recovery entry
  • [07/08] Based on 7.4.3 stock kernel
  • [07/08] Fixed recovery bootloop issue
  • [07/08] Screen timeout feature currently disabled due to screen blanking bug
  • [07/08] TWRP 2.6.0.0 update
  • [07/08] Added "EFS" partition backup option. Normally, don't need to make too many backups of this, but having a backup will enable you to recover HDMI keys, and some other data.
 
Last edited:

Shawnsch

Senior Member
Jul 13, 2012
171
43
Re: [BOOTLOADER] Install 2nd-bootloader for Custom ROMs on KFireHD 7"

Can I use install this and still use stock os?

Sent from my KFTT using XDA Premium HD app
 
Last edited:

0xD34D

Senior Member
Feb 7, 2009
461
2,041
San Diego
For those using this, for some reason that moment waiting for the device to boot into recovery can seem like eternity. It does take a bit to finally enter recovery but it will eventually do so. You'll see the BLUE logo for a little while so just be patient.
 

Hashcode

Senior Recognized Developer
Sep 3, 2011
3,426
23,731
Re: [BOOTLOADER] Install 2nd-bootloader for Custom ROMs on KFireHD 7"

I am looking into a loaner device so that I can setup the kernel for the HD7. So while this new bootloader may seem useless at the moment, that may change.

I am still very busy, of course so it may take time.

Sent from my DROID RAZR HD using Tapatalk 2
 
  • Like
Reactions: jimyv and quan_1986

persano

Senior Member
Nov 25, 2012
1,612
263
23
Buenos Aires
I am looking into a loaner device so that I can setup the kernel for the HD7. So while this new bootloader may seem useless at the moment, that may change.

I am still very busy, of course so it may take time.

Sent from my DROID RAZR HD using Tapatalk 2

start up time of device xD. you are the best rom kernel here. thanks for your beautiful job.

if you need any help or something i can help you with all
 

Hashcode

Senior Recognized Developer
Sep 3, 2011
3,426
23,731
I added a missing step where the auto recovery updater runs in the OS on stock boot:

To disable this auto recovery installer do this via adb:
Code:
adb shell su -c "mount -o remount,rw ext4 /system"
adb shell su -c "mv /system/etc/install-recovery.sh /system/etc/install-recovery.sh.bak"
adb shell su -c "mount -o remount,ro ext4 /system"
 
  • Like
Reactions: quan_1986

etom

Member
Jan 13, 2009
19
6
Chicago
Awesome! I Had 1 small glitch.....

Thanks!! This is awesome. I've been trying to get my Kindle backed up since I got it. I had it rooted the next day and have been toying with it being extra careful not to go too far. Now the fun begins.

One thing....I had to rename kfhd7-twrp-2.3.3.0-recovery.img to get it to flash. I just renamed it to recovery.img

In case anyone else runs into this error

Code:
C:\>fastboot -i 0x1949 flash boot kfhd7-freedom-boot.img
target reported max download size of 1006632960 bytes
sending 'boot' (8145 KB)...
OKAY [  2.794s]
writing 'boot'...
OKAY [  0.681s]
finished. total time: 3.475s

C:\>fastboot -i 0x1949 flash recovery kdh7-twrp-2.3.3.0-recovery.img
target reported max download size of 1006632960 bytes
error: cannot load 'kdh7-twrp-2.3.3.0-recovery.img': Unknown error


C:\>fastboot -i 0x1949 flash recovery recovery.img
target reported max download size of 1006632960 bytes
sending 'recovery' (8145 KB)...
OKAY [  2.804s]
writing 'recovery'...
OKAY [  0.671s]
finished. total time: 3.475s

C:\>fastboot -i 0x1949 reboot
rebooting...

finished. total time: 0.010s
 

Hollaback12786

Senior Member
Aug 31, 2011
63
18
Re: [BOOTLOADER] Install 2nd-bootloader for Custom ROMs on KFireHD 7"

I cant wait til i get a factory cable :D thank you to whoever participated in getting this going.

Sent from my KFTT using Tapatalk HD
 

Hinzman420

Senior Member
Oct 28, 2010
285
36
Re: [BOOTLOADER] Install 2nd-bootloader for Custom ROMs on KFireHD 7"

Thanks!! This is awesome. I've been trying to get my Kindle backed up since I got it. I had it rooted the next day and have been toying with it being extra careful not to go too far. Now the fun begins.

One thing....I had to rename kfhd7-twrp-2.3.3.0-recovery.img to get it to flash. I just renamed it to recovery.img

In case anyone else runs into this error

Code:
C:\>fastboot -i 0x1949 flash boot kfhd7-freedom-boot.img
target reported max download size of 1006632960 bytes
sending 'boot' (8145 KB)...
OKAY [  2.794s]
writing 'boot'...
OKAY [  0.681s]
finished. total time: 3.475s

C:\>fastboot -i 0x1949 flash recovery kdh7-twrp-2.3.3.0-recovery.img
target reported max download size of 1006632960 bytes
error: cannot load 'kdh7-twrp-2.3.3.0-recovery.img': Unknown error


C:\>fastboot -i 0x1949 flash recovery recovery.img
target reported max download size of 1006632960 bytes
sending 'recovery' (8145 KB)...
OKAY [  2.804s]
writing 'recovery'...
OKAY [  0.671s]
finished. total time: 3.475s

C:\>fastboot -i 0x1949 reboot
rebooting...

finished. total time: 0.010s

Thank you i soft bricked my kindle trying flash recovery. Once i changed to recovery.img it worked great

Sent from my KFTT using xda app-developers app
 

hamidwt

Senior Member
Oct 11, 2012
98
12
I am looking into a loaner device so that I can setup the kernel for the HD7. So while this new bootloader may seem useless at the moment, that may change.

I am still very busy, of course so it may take time.

Sent from my DROID RAZR HD using Tapatalk 2

I'm so happy to hear that you finally decided to work on kfhd 7 too, doesn't matter how long it takes, it's good to know we'll get it after all.
Thanks
 

smirkis

Senior Member
Oct 8, 2010
1,820
611
San Diego, CA
Re: [BOOTLOADER] Install 2nd-bootloader for Custom ROMs on KFireHD 7"

awesome! guess I gotta go get the kfhd from my dad n do some testing. great news for the community. on the old kf1 it all started with a bootloader. the rest is sure to follow!

Sent from my Nexus 4 using xda premium
 

Reflexdarky

Senior Member
Jul 4, 2012
89
19
kindle

i managed to flash the recovery fine in fastboot but now i am stuck in a bootloop and unable to run the stock os is this normal or have i done somthing wrong


Rob:good:

EDIT: okie so i tried from a clean fresh system using the restore images, i have managed to install the recovery bootloader no problem and i can access it, but if i leave the kindle and want to boot stock it goes orange and the texts flashes like normal and just when you think its going to boot it reboots and does the same thing over and over and over only way to get it to boot is wacking in the fastboot usb and then flashing the stock boot.img i also tried flashing revs beta rom and in twrp it always says error status 7 dunno if that is becasue its not the finished thing or not i am bit stuck now :(
 
Last edited:

Hashcode

Senior Recognized Developer
Sep 3, 2011
3,426
23,731
Re: [BOOTLOADER] Install 2nd-bootloader for Custom ROMs on KFireHD 7"

try wiping data/cache? (factory reset)

Sent from my DROID RAZR HD using Tapatalk 2
 

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  • 122
    [BOOTLOADER] 2nd-bootloader for Custom ROMs on KFireHD 7" [06/24 CM12.1/TWRP 2.8.7.0]

    Introducing: Kindle Fire 2nd-bootloader + TWRP 2.8.x.x for the Kindle Fire HD 7

    *** USE AT YOUR OWN RISK! WHILE I TRY MY BEST TO PROVIDE WORKING KERNELS/ROMS, I AM NOT RESPONSIBLE IF THIS SOFTWARE OR ANYTHING I'VE WORKED ON SUDDENLY FRIES YOUR DEVICE. ***

    ** THESE FILES WILL ONLY WORK ON A KINDLE FIRE HD 7 **

    ** WHEN MODDING THE KFIRE HD YOU SHOULD HAVE WORKING FASTBOOT DRIVERS/ACCESS ON YOUR PC. **


    LOOKS LIKE NOT ALL FASTBOOT CABLES WILL AUTOMATICALLY PLACE YOU IN FASTBOOT MODE ON THE KINDLE FIRE HD 7. DOWNLOAD THE ANDROID SDK AND GO FROM THERE.
    http://developer.android.com/sdk/index.html

    Here's 1 website you can purchase a FASTBOOT adapter from (works with your normal USB cable)
    http://shop.teamblackhat.info/Factory-Adapters-motadapt.htm
    ** I don't make any commission or fee from the sales of these devices, I just know they have them on stock most of the time and ship in a reasonable time frame unlike the Chinese variants found on ebay.

    Q: How do I know if my fastboot works?
    A: With the Kindle powered down, type the following command into a cmd/terminal window on your PC (should return with: < waiting for device> ):
    fastboot -i 0x1949 getvar product

    Then connect your fastboot cable to the Kindle and reboot. It *SHOULD* show a Fastboot screen and your terminal window should show something like:
    product: Tate-XXX-XX (something here)

    Type this to reboot out of fastboot mode:
    fastboot -i 0x1949 reboot


    ** IF YOU HAVE QUESTIONS, RE-READ THROUGH THE THREAD FOR ANSWERS. WHEN YOU'RE ABSOLUTELY SURE NO ONE HAS ASKED YOUR QUESTION, GO AHEAD AND RE-READ THE THREAD AGAIN AND USE THE SEARCH FEATURE. THEN POST YOUR QUESTION IF YOU STILL CAN'T FIND THE ANSWER **



    INSTRUCTIONS FOR INSTALLING A 2ND-BOOTLOADER TO LOAD CUSTOM KERNELS / ROMS / RECOVERY:
    *** BE SURE YOU HAVE A GOOD CHARGE ON THE DEVICE ***

    STEP 1. Backup your stock partitions to your own HD for later if you need disaster recovery:
    Code:
    adb shell su -c "dd if=/dev/block/mmcblk0boot0 of=/sdcard/boot0block.img"
    adb shell su -c "dd if=/dev/block/platform/omap/omap_hsmmc.1/by-name/boot of=/sdcard/stock-boot.img"
    adb shell su -c "dd if=/dev/block/platform/omap/omap_hsmmc.1/by-name/recovery of=/sdcard/stock-recovery.img"
    adb shell su -c "dd if=/dev/block/platform/omap/omap_hsmmc.1/by-name/system of=/sdcard/stock-system.img" # This will take a few minutes
    adb pull /sdcard/boot0block.img
    adb pull /sdcard/stock-boot.img
    adb pull /sdcard/stock-recovery.img
    adb pull /sdcard/stock-system.img # This will take a few minutes
    Take those files and put them somewhere safe.

    **** MAC USERS MAY NEED TO SPARSE THE FILES FOR RE-FLASHING TO THE DEVICE. I NEED A MAC USER TO PROBABLY WORK THROUGH THAT PROCESS AND POST BACKUP COPIES OF THE STOCK PARTITIONS FOR DISASTER RECOVERY ****


    STEP 2: Download the files you will need to install 2nd-bootloader, TWRP and CM:

    ON THE FOLLOWING DEV-HOST LINKS
    USE THE BLUE "DOWNLOAD NOW" BUTTON
    -- DO NOT INSTALL AN EXECUTABLE DOWNLOADER TO YOUR SYSTEM! --
    I'LL LOOK FOR A BETTER HOST WHEN I GET MORE TIME.

    1. Stack override file:
      Mirror 1: Download "stack" from Dev-Host
    2. [12/09] kfhd7-freedom-boot-7.4.6.img (USED ONLY THE FIRST TIME -- .zip files will have their own boot.img's from now on):
      Mirror 1: Download "kfhd7-freedom-boot-7.4.6.img" from Dev-Host
      md5sum: 1628fc4750d0d49cbce41ab616a9d732
    3. [06/24] TWRP 2.8.7.0 recovery flash Image:
      Mirror 1: Download TWRP from Dev-Host
    4. CM-12.1 for the Kindle Fire HD 7 (choose the latest version from):
      Mirror 1: Downloads CM
    5. Google Apps from Android File Host:
      https://www.androidfilehost.com/?w=files&flid=25361 (Use 5.1 version!)
    6. Download the older 7.2.3 bootloader file and flash to your device via fastboot:
      Mirror 1: Download bootloader from Dev-Host
      md5sum bb029673d8f186db4dff6d38f4aa28cf
      (You SHOULD check the md5sum before using fastboot -- downloads CAN be corrupted)
    Place the CM-12.1 ROM and the gapps .zip on your device in the /sdcard area


    STEP 3. Install the stack override in /system:
    ADB commands entered while booted up into STOCK *rooted* Amazon Kindle OS -- May need to enable ADB debugging in Settings:
    [2013-08-21] edited the location where stack is placed on device due to permissions changes
    Code:
    adb push stack /sdcard/
    adb shell su -c "dd if=/sdcard/stack of=/dev/block/platform/omap/omap_hsmmc.1/by-name/system bs=6519488 seek=1"

    STEP 4. Stop the auto recovery update script (this file may or may not be present):
    Code:
    adb shell su -c "mount -o remount,rw ext4 /system"
    adb shell su -c "mv /system/etc/install-recovery.sh /system/etc/install-recovery.sh.bak"
    adb shell su -c "mount -o remount,ro ext4 /system"


    STEP 5:
    [ With the device powered off: connect your FASTBOOT USB cable to the Kindle which should cause it to power on and enter "FASTBOOT" mode. Issue the following commands into your command/terminal window on your PC 1 at a time. ]

    Code:
    fastboot -i 0x1949 flash bootloader kfhd7-u-boot-prod-7.2.3.bin
    fastboot -i 0x1949 flash boot kfhd7-freedom-boot-7.4.6.img
    fastboot -i 0x1949 flash recovery kfhd7-twrp-2.8.7.0-recovery.img
    fastboot -i 0x1949 reboot

    *DONT RE-FLASH FREEDOM-BOOT.IMG LATER AFTER FLASHING CUSTOM ROMS -- IT'S FOR STOCK AMAZON OS ONLY / FIRST INSTALL ONLY*

    ** If everything was done correctly your Kindle will reboot and you will at first see the normal Kindle Fire ORANGE logo and then it will fade and come back as a BLUE logo. **

    TO ENTER RECOVERY:
    Press the left volume button (volume up) while the logo is still YELLOW and keep pressing until the logo turns BLUE. Wait a moment and you should enter recovery.


    STEP 6:
    CM-12.1 AND GAPPS INSTALLATION:
    • (OPTIONAL) Make a backup by selecting "Backup" and then slide your finger to the right on the "Swipe to Back Up"
    • Once complete use the pentagon "Home" icon in the lower left corner of the screen
    • Now, select "Wipe"
    • Swipe the "Swipe to Factory Reset"
    • Use the "Home" icon
    • Select "Install"
    • Browse to the location on your device where you saved the CM-12.1 / GAPPS .ZIP files
    • Select the CM12.1 ZIP file in the list by touching it, then confirm it says the name of the CM-12.1 .ZIP file on the next screen under "File to flash:"
    • Select "Add More Zips"
    • Select the GAPPS ZIP file in the list by touching it -- make sure it says the name of the .ZIP again under "File to flash:"
    • Swipe the "Swipe to Confirm Flash", and wait for it to finish.
    • If the screen is blank at any time you can hit the power button to "wake up" the device
    • Once the flash is done, you'll see a "Home" and "Reboot" buttons at the bottom of the screen
    • Select "Reboot"

    CONGRATULATIONS YOU NOW HAVE THE ABILITY TO INSTALL CUSTOM KERNELS / RECOVERY AND ROMS.


    FLASHING BACK TO STOCK:
    ** FIND THE FILES WE BACKED UP IN STEP #1: ** OR Follow this thread's instructions:
    http://forum.xda-developers.com/showthread.php?t=1951254

    **** MAC USERS MAY NEED TO SPARSE THE FILES FOR RE-FLASHING TO THE DEVICE. I NEED A MAC USER TO PROBABLY WORK THROUGH THAT PROCESS AND POST BACKUP COPIES OF THE STOCK PARTITIONS FOR DISASTER RECOVERY ****

    Plug in your fastboot cable and reboot so that you see the fastboot screen. On your computer go into a prompt and change to the directory where your stock backups are and enter the following commands:
    Code:
    fastboot -i 0x1949 flash boot [B]stock-boot.img[/B]
    fastboot -i 0x1949 flash recovery [B]stock-recovery.img[/B]
    fastboot -i 0x1949 flash system [B]stock-system.img[/B] # This one will take a few minutes
    fastboot -i 0x1949 reboot


    THANKS TO:
    • fattire for finding the original bootloader exploit
    • verygreen for doing some initial work on the 2nd-bootloader and fixing bugs (and letting me copy some of his bootloader installation instructions)
    13
    Changelog: updated 2013-07-08

    freedom boot.img (for use w/ stock Amazon OS + 2nd-bootloader):
    • [07/08] Updated w/ kernel from 7.4.3 release

    Amazon OS .zip:
    • [07/08] Rebuilt on version 7.4.3 from Amazon

    TeamWin Recovery (TWRP) 2.6.0.0

    • [*][07/08] USB Vendor ID / Product ID in recovery now matches stock Amazon OS
    • [07/08] Fixed long pause before recovery entry
    • [07/08] Based on 7.4.3 stock kernel
    • [07/08] Fixed recovery bootloop issue
    • [07/08] Screen timeout feature currently disabled due to screen blanking bug
    • [07/08] TWRP 2.6.0.0 update
    • [07/08] Added "EFS" partition backup option. Normally, don't need to make too many backups of this, but having a backup will enable you to recover HDMI keys, and some other data.
    6
    I added a STEP 6 which is optional but recommended:

    Because we had to drop a 4K file right in the middle of the operating system, there is a chance that we've killed a binary that is used by the OS. As a final "cleanup" step to installing the bootloader, I recommend everyone re-flash the OS to /system. The stack space is pre-allocated during this process so that the files going back onto the /system partition will NOT land on it anymore.

    Download a flashable Amazon OS ROM (7.2.3): Amazon OS 7.2.3: http://goo.im/devs/Hashcode/tate/kfhd7-amazon-os-7.2.3.zip Place this in the /sdcard

    This is the stock Amazon OS which is rooted, has Superuser.apk and busybox. (Users can use this as an easy means of going back to stock the easy way via recovery. It also includes the modified boot.img including the 2nd-bootloader).

    INSTALL THE .ZIP IN TWRP:
    • Select "Install"
    • Use the file manager to browse and click on the "kfhd7-amazon-os-7.2.3.zip" file.
    • Swipe to start.
    • Once that's done, reboot.

    NOTE: Once we start using Jellybean ROMS, the location of "sdcard" can move and to find this file you may need to go "Up a level" to find "data" and then "media" and look for it in there.
    4
    Re: [BOOTLOADER] Install 2nd-bootloader for Custom ROMs on KFireHD 7"

    Can I use install this and still use stock os?

    Sent from my KFTT using XDA Premium HD app

    Yes, that's how the initial install is setup.

    Sent from my DROID RAZR HD using Tapatalk 2
    4
    Re: [BOOTLOADER] Install 2nd-bootloader for Custom ROMs on KFireHD 7"

    Whenever I get around to installing ubuntu or linux on my 2nd hard drive I plan on downloading the sdk, gonna start to try and learn a thing or 2 in the world of android development :D

    Edit: hey hashcode, i just noticed twrp recovery was updated to 2.4, can i just flash it thru fastboot? Or does it need to be modified for the HD7?

    Sent from my KFTT using Tapatalk HD

    The custom recovery and kernels we use on the new Kindle Fires require special modifications or they will break on Amazons signature check.

    I can build a new recovery with the 2.4 update over the next few days. It will probably come in 2 forms:
    - an updated image file for use during the 2nd bootloader installation
    - a flash .zip update for those who are already running custom recovery.

    Sent from my DROID RAZR HD using Tapatalk 2