First off download the following files
KFHD_SRTv2.1- 8.1.4
img files
KFFirstAide32
or
KFFirstAide64
Extract KFFirstAide whichever version 32 or 64
Copy the folder to c:\
rename it to just KFFirstAide
add that to your path
Open the folder KFHD_SRTv2.1 then open images folder and copy system.img
paste it into the KFFirstAide folder
then open the two other img files you downloaded and paste them into the KFFirstAide folder as well
you should now have:
system.img
boot.img
recovery.img
All three files in the KFFirstAide folder
now
Open up an Administrative Command Prompt from within the KFFirstAide
go to the c:\ drive hold the shift key and right click on the folder KFFirstAide then select Open a command prompt here.
enter this command at the prompt
Code:
fastboot -i 0x1949 getvar product
it should come back with
< waiting for device >
If you are stuck at the red triangle screen
Make sure your device is totally off hold the power button for like 30 seconds until it turns off
next plug in your device with the usb cable
it should boot into fastboot mode
and show something like:
product: Jem-PVT-Prod-04
finished. total time: 0.009s
then type this command
Code:
fastboot -i 0x1949 devices
should come back with something like this
7EE400003C002FFF fastboot
then type this command
Code:
fastboot -i 0x1949 flash system system.img
should come back with something like
target reported max download size of 1006632960 bytes
sending 'system' (907264 KB)...
OKAY [ 48.857s]
writing 'system'...
OKAY [ 60.331s]
finished. total time: 109.193s
next command
Code:
fastboot -i 0x1949 flash boot boot.img
should show something like
target reported max download size of 1006632960 bytes
sending 'boot' (8192 KB)...
OKAY [ 0.449s]
writing 'boot'...
OKAY [ 0.571s]
finished. total time: 1.024s
next command
Code:
C:\KFFirstAide>fastboot -i 0x1949 flash recovery recovery.img
should see something like
target reported max download size of 1006632960 bytes
sending 'recovery' (8192 KB)...
OKAY [ 0.449s]
writing 'recovery'...
OKAY [ 0.565s]
finished. total time: 1.020s
these next commands take forever
Code:
fastboot -i 0x1949 erase cache
should come back with
erasing 'cache'...
OKAY [ 47.246s]
finished. total time: 47.250s
Code:
fastboot -i 0x1949 erase userdata
should come back with
erasing 'userdata'...
OKAY [2149.490s]
finished. total time: 2149.494s
and finally
Code:
fastboot reboot -i 0x1949
once it starts rebooting disconnect the USB cable
once you are back up and running you will be at version 8.1.4
to get to current version
you can use KFFirstAide and this time run
c:\KFFirstAide\RunMe.bat
use the option enable OTA updates
you will have to make sure ADB is enabled under security first on your kindle
once you enable OTA updates then unplug the USB
Next :
Charge the battery, and then connect to a Wi-Fi network.
Swipe down from the top of the screen, and then tap Sync.
The software update automatically downloads in the background and installs after the download is complete and the device is asleep.
Your Kindle Fire will restart during the software update. After the restart, the message “Kindle is updating” will appear on the screen and when it's finished you will be at the latest software version.