Develop Bugs

[Q] Stuck on fastboot and need new ideas on recoveries

So I bought a 8.9 KFHD Demo unit. I gained access to fastboot through command prompt and have all the drivers installed. Stupidly, I used the KFHD System.img Recovery Tool for the 7 inch model on it and subsequently it boots up and says Kindle Fire for a few second, a red screen washes over, and then it says fastboot and stays that way. I then proceeded to erase cache and used the KFHD System.img Recovery Tool for the 8.9 inch version, the one I have. Sadly, it proceeds with the recovery but my kindle is still stuck booting into fastboot mode. Anyone have any ideas? Or did I break it for good.. Thanks for any help

You try "fastboot -i 0x1945 reboot"?
Sent from my Amazon Kindle Fire HD running CM10.1 Tablet UI using xda-developers app

stunts513 said:
You try "fastboot -i 0x1945 reboot"?
Sent from my Amazon Kindle Fire HD running CM10.1 Tablet UI using xda-developers app
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I think you meant 1949, and yah it just reboots it and it boots into fastboot mode, plugged into my PC or not.
Edit: I also saw your other post in a similar thread about restoring stock boot loader but requiring the check of md5sum... was going to try that but wanted to ask if I am checking that the md5sum of the stock bootloader is the same as the one i am downloading?

Well that's one way to look at it because they should be identical if its the same version boot loader, but the md5sum is supposed to match the md5sum listed on the download. Also yes I made a typo in the previous post, thanks for pointing that out. You can also try something like "fastboot -i 0x1949 oem idme bootmode 1". For the record I don't remember which idme number is normal boot on the 2nd gen devices. The original kindle fire's had a different set of numbers for idme, but I believe the 2nd gen kf's use 0-3, so you might have to try a few numbers to get it right. I looked it up somewhere before and I believe found which one was supposed to me normal boot, but I don't believe i can look far enough back in my posts to find it via the xda app I'm using.
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stunts513 said:
You try "fastboot -i 0x1945 reboot"?
Sent from my Amazon Kindle Fire HD running CM10.1 Tablet UI using xda-developers app
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stunts513 said:
Well that's one way to look at it because they should be identical if its the same version boot loader, but the md5sum is supposed to match the md5sum listed on the download. Also yes I made a typo in the previous post, thanks for pointing that out. You can also try something like "fastboot -i 0x1949 oem idme bootmode 1". For the record I don't remember which idme number is normal boot on the 2nd gen devices. The original kindle fire's had a different set of numbers for idme, but I believe the 2nd gen kf's use 0-3, so you might have to try a few numbers to get it right. I looked it up somewhere before and I believe found which one was supposed to me normal boot, but I don't believe i can look far enough back in my posts to find it via the xda app I'm using.
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Neither 0-3 do anything, on my kindle. Although, each one says finished in the cmd prompt. Should I go ahead and tr flashing the stock loader on? or should I of done that before trying your line of code.

You didn't necessarily need to flash the boot loader beforehand, and did it reboot after issuing the command I mentioned? If not did u try a simple fastboot reboot afterwards like I Initially said to do? You just need to be careful if you are going to flash the boot loader, like I said make sure to check the md5sum and of course make sure its the boot loader for your model.
Sent from my Amazon Kindle Fire HD running CM10.1 Tablet UI using xda-developers app

None of those commands did anything but I did do the reboot command and it rebooted back into fastboot mode. I guess I will try to flash the stock bootloader now...

So after trying different recoveries I have gotten my kindle out of fastboot but now it is stuck on the Kindle Fire System Recovery screen asking me to reboot or reset to factory defaults because it failed to boot(neither option fixes it). I tried the KFHD System.img Recovery Tool to no avail. Not sure what to do now. Do i need to flash the complete stock OS to it?
I used KFHD First Aide to get to this point. After I use it though, on the recovery screen I get a bunch of errors saying it can't mount cache. On the KF First Aide bat file prompt it says it erased cache, then attempted to format it but it's not automatically formatted as the file system type is not supported. I am wonder is these things are related.

Try running kffa one more time, it usually goes to recovery when something is messed up with the system partition, so try another reflash.
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Same thing happens. Says it didn't automatically format userdata or cache and then when the kindle boots it goes to recovery and the errors says" E:Can't mount /cache/recovery (Invalid argument)
because kffa downloads the files it flashes do you think those were corrupted? It only downloads them once so when i run it again its flashing same files.

Ah well that could be the case, but this error seems to be an issue with mounting the recovery partition which is weird because recovery seems to work fine, at least I think its trying to mount recovery, though that is in the cache path so I have no idea. Might have to ask soupmagnet about this.
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Yegort said:
So after trying different recoveries I have gotten my kindle out of fastboot but now it is stuck on the Kindle Fire System Recovery screen asking me to reboot or reset to factory defaults because it failed to boot(neither option fixes it). I tried the KFHD System.img Recovery Tool to no avail. Not sure what to do now. Do i need to flash the complete stock OS to it?
I used KFHD First Aide to get to this point. After I use it though, on the recovery screen I get a bunch of errors saying it can't mount cache. On the KF First Aide bat file prompt it says it erased cache, then attempted to format it but it's not automatically formatted as the file system type is not supported. I am wonder is these things are related.
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hi I have the same problem you once had I have kindle fire hd 7 I two am in this boot then red screen then stuck in fastboot how did you fix this any help would really help me many thanks

You should try reflashing the bootloader, just make sure you grab the right bootloader for your device and check its md5sum against then one listed on the download. If you don't check the md5sum you are liable to hard brick it. From there it should be as simple as flashing the rest of the partitions from fastboot and hoping it works.
Sent from my Amazon Kindle Fire HD using Tapatalk

Wiped kindle fire HD using TWRP not being detected by pc

i rooted my kindle fire a couple of days ago and then decided to try and install cyanogen mod, to no avail then i was stuck in blue screen repeat and my younger brother who i admit is more tech-savvy than myself managed to get into [TWRP] and he [FORMAT DATA] i don't even have the slightest of idea of how to fix this nor does he, help?

Formatting data shouldn't have been a problem, you sure you installed a ROM for your device and that you did a factory reset beforehand?
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Nope, no ROMS on the Device, and when i connected it to the PC i got the JEM-PROD-4 error but i manages to fix that with your modified adb drivers, i just want to get the standard kindle OS back i learnt my lession here g-store and root is good enough, if it isn't broke don't fix it.
I heard factory cable are :/ on the KFHD8.9
I want to restore it to its original state
Is there anyway to maybe push a system image onto the kindle? i installed the ADB as i said before but my kindle still isn't being permanently detected

Just use kindle fire first aid to fix it, its in the 7" general section, also I highly recommend installing a custom ROM, you just have to make sure to put the ROM and gapps on the sdcard ahead of time to make it easy on yourself. If you do decide to do it again just ask for some help when doing it and I'll be glad to post back.
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Wait so how/when willl my device become recognisable by my system?

I thought you said it was.
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ah its being detected my bad, the KFFA Tut is somewhat difficuilt to understand no videos around?
The eight step of the guide is baffling Kindle Fire First Aide Step 10 tells me to get onto the kindle when it is wiped and locked in kindlefire blue logo repeat i can get into TWRP but thats about it, and also to fix bootloader i need to have superuser/root and i no longer belive that is on here since the wipe

OK I'm not one to go against instructions unless I know what I'm doing, but if you already have java installed, have you tried just running run me.bat? Also what's confusing by in that step? I'm a PC tech so I understand it, but you don't so I don't know which part is confusing.
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broke it down re-arranged it understood did it, i need a factory cable but i hear 8.9 doesn't so i just want to download a system image and smack that onto the kindle i'm download KFDH_SRT_V2.1 right now but i don't know where i should put it in the KFFirstAide directory,
downloading from here http://forum.xda-developers.com/showthread.php?t=2011126 or do i have to tuse the official tool and if so can i get a link.?
constanly updating here, discovered that The tool was in the image or vice-versa and then went to run it only for every time i attempt a CMD command it says fastboot is not recognized as an internal or external command so i can't upload the image to my kindle do i have to move the folder or a file?
Managed to get it to work, go into fastboot and then whatever command i run with fastboot -i 0x1949 flash boot boot.img and the recovery one gives me an errror : flash boot boot.img
error: cannot load 'boot.img': No error :/
after spending at least 5 hours scrolling through thread after thread i give up, is there like a kindle unbricking shop or should i just crack the screen and try to get a use on the warranty?only owned this for 5 days.

OK how do I begin... I don't know what you were trying to do with kfhd SRT by putting it into the kffa directory. Try just downloading the system restore tool, and running it and seeing if you can restore it. From the sounds of it I don't know what you did but the boot.IMG was missing from the kfsrt directory.
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[Q] Can't get ADB to communicate with Kindle Fire 8.9 HD

Hi folks. I've been studying the forums for a few days now and can't resolve my issue. Hoping you will tolerate a noob dilemna.
I have a KF 8.9 HD running CM 10.1 and play store with no issues. Runs flawlessly. In my attempt to try out the CM 10.2 I wiped out the internal memory, cache etc.
I'm using Windows 8.1 to communicate with the KF.
I can only see the Kindle and use the ADB commands if I boot into TWRP. It reports the number and recovery when I run ADB devices in an admin command window. I'm unable to use the ADB commands when the KF is running the 10.1 OS desktop. Windows device manager reports it as MTB USB Device instead of the ADB Composite Device I get when it's running in TWRP. No matter how much tinkering and uninstalling KF drivers, I can't get it to see the KF.
I've also downloaded KF FirstAide.I get all of the menu options but it hangs whenever I try any options. For example, it hangs after reporting daemon started successfully when I try to use the safe diagnostics. I can't get it to communicate with the KF.
I'm in need of restoring this KF 8.9 HD to Amazon stock OS. I've ordered a new one and will be passing this one on to someone that's looking for the Amazon stock system. Otherwise I'd leave it as it since CM 10.1 is running.
Really appreciate the help you can give me.

You have to enable adb in cm 10.1, click on the build number about 10 times under "about tablet" in settings, that should enable the developer menu in settings so you can enable adb.
Sent from my Amazon Kindle Fire HD running CM10.1 Tablet UI using xda-developers app

stunts513 said:
You have to enable adb in cm 10.1, click on the build number about 10 times under "about tablet" in settings, that should enable the developer menu in settings so you can enable adb.
Sent from my Amazon Kindle Fire HD running CM10.1 Tablet UI using xda-developers app
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Thanks Stunts. That should get me closer to figuring this out. The {} Developer Options are now visible on the KF. Root access is set to Apps and ADB. Uninstalled KF Win 8.1 device drivers again and rebooted both KF and computer. Still doesn't see it in Win 8.1 when I use ADB Devices (doesn't report any devices).
The Windows driver is still reporting MTB USB Device. When I try to update the driver using androide_usb.inf windows reports there is no compatible software driver in that folder.
I'll keep messing with the Developer Options on the KF. Any other suggestions?

Stupid question but did you check the box to enable adb? I didn't see that said you did only something else so I thought I'd ask. Also the MTP device is desperate so you shouldn't have to update it with the adb drivers, it should be a desperate device usually under its own android debugging category if I remember right.
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stunts513 said:
Stupid question but did you check the box to enable adb? I didn't see that said you did only something else so I thought I'd ask. Also the MTP device is desperate so you shouldn't have to update it with the adb drivers, it should be a desperate device usually under its own android debugging category if I remember right.
Sent from my Amazon Kindle Fire HD running CM10.1 Tablet UI using xda-developers app
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I gave up on getting it to work in Windows 8.1. There must be something about the way it handles the drivers that prevents the device being seen when CM10.1 is running. Very frustrating. I must have tried 100 different variations but I can only get it to see the KF in Portable Device Player, not the Android Composite Device it sees when I'm running in TWRP mode.
I ended up using my daughter's netbook which is running Windows 7. Installed Java Developers Tools, KF First Aide. I can now see finally both the device as the portable media player and the Android Composite Device. Yeah!
One last problem to overcome. I want to wipe the KF clean and install the stock Amazon system. KFAide now communicates with the device in CM10.1. I was able to do a backup but it still hangs when I try to restore the stock system.
Is there a place a can get the stock image files for KF 8.9 HD? 8.1.3 or 8.1.4 should be fine (I don't remember which I was running before installing CM10.1). Ideally I want to transfer the stock images to the SDCard directory and then use TWRP to reinstall. Sound reasonable?

If you want full unrooted stock just download the latest update from Amazon's website for your device, put it on the kindle's sdcard and change the extension to .zip, and wipe the system, and do a factory reset then flash the amazon update, it should remove twrp and 2nd boot loader as well
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stunts513 said:
If you want full unrooted stock just download the latest update from Amazon's website for your device, put it on the kindle's sdcard and change the extension to .zip, and wipe the system, and do a factory reset then flash the amazon update, it should remove twrp and 2nd boot loader as well
Sent from my Amazon Kindle Fire HD running CM10.1 Tablet UI using xda-developers app
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Thanks again Stunt. Want to make sure I do this correctly.
Do I just check off wipe system in twrp or other items like internal memory etc. I'm thinking just system.
Is the factory reset from within twrp?
Finally, do i flash while in fastboot mode?
Sorry for all the questions. Appreciate the help

When you hit wipe I believe there is a factory reset button, and after that you would do another wipe and check system, then install the amazon update zip file from within twrp, not fastboot.
Sent from my Amazon Kindle Fire HD using Tapatalk

Ruacasa said:
Thanks again Stunt. Want to make sure I do this correctly.
Do I just check off wipe system in twrp or other items like internal memory etc. I'm thinking just system.
Is the factory reset from within twrp?
Finally, do i flash while in fastboot mode?
Sorry for all the questions. Appreciate the help
Click to expand...
Click to collapse
How to Disable Driver Signature Enforcement to allow installation of Windows 7 Printer Drivers on Windows 8 http://www.fotoclubinc.com/blog/how...on-of-windows-7-printer-drivers-on-windows-8/

Crap! Now it hangs on the Kindlefire screen (orange color not the blue rooted color).
I can use KDFirstAide to get it back in fastboot mode. I tried the various options to restore su, erase cache and user data etc, but nothing. It continues to hang at the KindleFire screen
Any suggestion? Are there any Fastboot commands I can use to restore and use twrp again?

You need to run "fastboot -i 0x1949 getvar product" with the kindle unplugged and off then plug it in when it says waiting for device, that should put it into fastboot so kffa can restore the system.
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stunts513 said:
You need to run "fastboot -i 0x1949 getvar product" with the kindle unplugged and off then plug it in when it says waiting for device, that should put it into fastboot so kffa can restore the system.
Sent from my Amazon Kindle Fire HD running CM10.1 Tablet UI using xda-developers app
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Tired it and ran KFF. KFF prompts me that the Kindle Must be Powered on to the Desktop to do a restore of the system. Can't get to the desktop at this point. If I select no at the desktop prompt it starts the deamon and hangs at that point. Probably because it's trying to use ADB which is not active in Fastboot mode.
I was successful in using KFF to do a backup restore, but it is still hanging on the KindleFire screen.
The only thing I can do right now is get to Fastboot mode using the KFRecovery utility and Enabling Fastboot to get to Fastboot mode.

Something didn't restore right then, have you tried kindle fire system restore tool? http://forum.xda-developers.com/showthread.php?t=2011126
Is fastboot mode working as far as you know from running the command I mentioned? It should report something back with jem in it .
Sent from my Amazon Kindle Fire HD running CM10.1 Tablet UI using xda-developers app

stunts513 said:
Something didn't restore right then, have you tried kindle fire system restore tool? http://forum.xda-developers.com/showthread.php?t=2011126
Is fastboot mode working as far as you know from running the command I mentioned? It should report something back with jem in it .
Sent from my Amazon Kindle Fire HD running CM10.1 Tablet UI using xda-developers app
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Fastboot is still working. I did run that command you posted: fastboot -i 0x1949 getvar product. It reported Prod: Jem-PVT-Prod-04.
I have tried the Recovery tool you linked to but it hangs when I try to restore the system (using any of the options)
Update: I was able to get KFFirstAide to complete it's recover using 8.1.2 option. I got a full red screen then it booted to the Fastboot Mode Screen. I feel I'm getting closer. I held the power button for 20 seconds, then release for 5 and power up again. It's still going into Fastboot Mode. Any advice?

Try restoring the system one more time, if that doesn't work you might have to reflash the boot loader. You can try "fastboot -i 0x1949 reboot" or "fastboot -i 0x1949 OEM idme bootmode 1" possibly followed by the first command. I have my doubts that command will work though and I'm not positive if system is 1 or not because the numbers used to be different on the original all and I'm not too familiar with the numbers on the hd models, but I think its 1.
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stunts513 said:
Try restoring the system one more time, if that doesn't work you might have to reflash the boot loader. You can try "fastboot -i 0x1949 reboot" or "fastboot -i 0x1949 OEM idme bootmode 1" possibly followed by the first command. I have my doubts that command will work though and I'm not positive if system is 1 or not because the numbers used to be different on the original all and I'm not too familiar with the numbers on the hd models, but I think its 1.
Sent from my Amazon Kindle Fire HD running CM10.1 Tablet UI using xda-developers app
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Thanks for sticking with me Stunts. I tried reinstalling it already. Tried both variations of the fastboot commands you listed. Is it possible the second one is missing an argument? When I enter it by itself it comes back as listing all of the fastboot options (I usually get that when I type something wrong).
So it sounds like I just need to get out of the Fastboot Mode. It always shows a full red screen before entering Fastboot Mode

Odd, I suggest reflashing the boot loader then, download the boot loader for your device here: http://forum.xda-developers.com/showthread.php?t=2128175
Its the 8.1.4 boot loader listed, make sure you check that the md5sum matches what's on that page or you could hard brick it.
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stunts513 said:
Odd, I suggest reflashing the boot loader then, download the boot loader for your device here: http://forum.xda-developers.com/showthread.php?t=2128175
Its the 8.1.4 boot loader listed, make sure you check that the md5sum matches what's on that page or you could hard brick it.
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Downloaded and installed new bootloader. No errors but no improvement. Cycles KindleFire (orange) then Full Red Screen Then Fastboot Mode.
I also reinstall using KF First Aide- Completely Restore The KFHD 8.9 8.2.1 option again.

Ruacasa said:
Fastboot is still working. I did run that command you posted: fastboot -i 0x1949 getvar product. It reported Prod: Jem-PVT-Prod-04.
I have tried the Recovery tool you linked to but it hangs when I try to restore the system (using any of the options)
Update: I was able to get KFFirstAide to complete it's recover using 8.1.2 option. I got a full red screen then it booted to the Fastboot Mode Screen. I feel I'm getting closer. I held the power button for 20 seconds, then release for 5 and power up again. It's still going into Fastboot Mode. Any advice?
Click to expand...
Click to collapse
A red screen is not good. Try Kindle Fire HD System Restore Tool http://forum.xda-developers.com/showthread.php?t=2011126
Sent from my Amazon Kindle Fire HD running CM 11 KitKat 4.4 using xda app-developers

LinearEquation said:
A red screen is not good. Try Kindle Fire HD System Restore Tool http://forum.xda-developers.com/showthread.php?t=2011126
Sent from my Amazon Kindle Fire HD running CM 11 KitKat 4.4 using xda app-developers
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Appreciate the help. I tried that recovery tool a few times. Just curious, which option should be selected in that tool? I think I tried them all already, but which one should be used to completely restore? Option 1 enables fastboot (got plenty of that...lol). Option 2 restores SU. Option 3 restores SU and other stuff i don't recognize. Option 4 had google stuff I don't recognize. But I did try all of them.

2013 Kindle Fire HD Factory Reset HELP!!

I got a KFHD 2G (2013) from a friend and the problem was simple: when the lock screen came up, he couldn't enter in his passcode because the keyboard wouldn't show up. There was no way to get into ADB since I couldn't get in. I tried to do a factory reset via recovery, but there is no recovery. I built a fastboot cable and tried "fastboot -w" but the partitions could not be formatted. This device seems completely screwed, I trued grabbing the factory update from amazon, but it's in BIN format and won't flash in Fastboot. Inside the BIN file, it seems to just be a recovery-flashable zip, however, it will not boot into recovery so i can't install it. Fastboot reports that two .txt files are missing. I tried extracting recovery.img from the zip and booting it as a ramdisk, however, this just causes it to boot normally. I ended up flashing userdata with boot.img as a way of formatting it, which got the keyboard back, but puts it on a screen saying "Enter password to decrypt Kindle." The password, "LOVE" is not accepted and entering 4 incorrect codes does not prompt a format. I'm at a loss here, it seems like it's just nt possibe for this thing to be screwed completely, but im out of options. what should i do?
HELP!!!
Also, I just realized this thread should be in "7" Kindle Fire HD Q&A, Help & Troubleshooting"

Um so now it's to the point where it's asking to format it because the password is wrong so wouldn't that be the same as formatting it as you had intended on doing earlier? BTW fastboot commands on a kindle fire have to be prefixed with "fastboot -i 0x1949", also I don't know off hand if that command you were going to run is a user data wipe or a complete wipe and a complete wipe would been bad. So at this point if the lock screen asks you to format it and you don't have adb enabled then you probably will have to format it, I thought the new gen had adb access from early on in the boot process but I could be wrong, I suggest looking in the hdx section.
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stunts513 said:
Um so now it's to the point where it's asking to format it because the password is wrong so wouldn't that be the same as formatting it as you had intended on doing earlier? BTW fastboot commands on a kindle fire have to be prefixed with "fastboot -i 0x1949", also I don't know off hand if that command you were going to run is a user data wipe or a complete wipe and a complete wipe would been bad. So at this point if the lock screen asks you to format it and you don't have adb enabled then you probably will have to format it, I thought the new gen had adb access from early on in the boot process but I could be wrong, I suggest looking in the hdx section.
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sadly, no adb, its not an HDX because it's only dualcore. i now need a system.img and userdata.img.. i flashed the img from the ADK for this device and now all i get is fastboot.. i need ripped imgs from an actual device. the command i was running was a userdata/cache wipe, and i did prefix it but fastboot couldnt format the partitions because the filesystem wasnt compatible. The lock screen flat out wouldnt ask me to format, and the back button never showed up, which leades me to believe the system image was corrupt too. if anyone can give me system.img and userdata.img i would be eternally grateful! thank you for replying

Ah I knew it wasn't an hdx but they some things on that device that are similar to the hdx, like I think they disabled some fastboot commands from working and such. Hopefully someone more familiar with 2nd gen hd's can help you out more.
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stunts513 said:
Ah I knew it wasn't an hdx but they some things on that device that are similar to the hdx, like I think they disabled some fastboot commands from working and such. Hopefully someone more familiar with 2nd gen hd's can help you out more.
Sent from my Amazon Kindle Fire HD running CM10.1 Tablet UI using xda-developers app
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so i borrowed a friends kindle and backed up his /system. i then sparsed it and it installed fine. when i booted up, i got a red flash and it threw me into fastboot. i then flashed the u-boot from the update file and now im bricked beyond all reair.. i run lsusb and get no mention of the device with my factory cable, and i cant get back in fastboot. the 2nd gen hd's suck so much..

Ouch, was his kindle a second gen HD?
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[Q] Stuck in fastboot mode

Hi, I successfully rooted my KF HD 8.9 with instructions found here
http://androidroot.org/watch_video.php?v=A7HRK4M23YG7
But am now stuck in fastboot mode (displayed on screen). I did have twrp installed and got the blue logo, but not anymore.
I tried KF First Aid, under the option “Display Fastboot Status” I get
“product JEM-PVT-Prod-04
6498000040002FFF fastboot
If you see output above it looks like fastboot is enabled”
Device Manager shows under “Kindle Fire > Android ADB Interface”
Have I bricked my Kindle?
Any help greatly appreciated

Its not bricked, though I would attempt to restore the system partition with kffa since 2nd bootloader is gone. You should be in fastboot mode so that's good at least.
Sent from my Amazon Kindle Fire HD using Tapatalk

Thanks for advice, unfortunately I'm not clever enough to do that without step by step instructions, could you help me?
Thank you

phatsteve said:
Thanks for advice, unfortunately I'm not clever enough to do that without step by step instructions, could you help me?
Thank you
Click to expand...
Click to collapse
Download Kindle Fire First Aid, find the option about restoring, and if it asks something about is it in fastboot already say yes(or if it asks to put it in fastboot mode say no as it should be already).

tried that exactly as you said, everything seemed to go ok, but when it rebooted it sticks on the kindlefire (orange) logo

Try using SRT instead. Ignore the adb command it lists, that's only for if you have a working kindle that can boot up fully, just stick it in fastboot again and use this utility and see if you have any luck.
Sent from my Amazon Kindle Fire HD using Tapatalk

Hi, I've tried about 10 times to download KFHD_SRT_v2.0.zip which seems to be for my device, but it fails every time
with message ' the source file cannot be read'. I have downloaded KFHD_SRTv1.3.5.zip, which appears to be for the 7" kindle.
Can I use this, or will the imgs be wrong? There are 4 in the images folder, boot.img, recovery.img, system.img, and systym2.img

The 7" version is not for the 8.9 version, you would probably brick it even worse using that... The ones on that link I sent you are the compatible ones.
Sent from my Amazon Kindle Fire HD using Tapatalk

that is the one I'm having trouble with, KFHD_SRT_v2.1.zip. While in Kindle Fire First Aid I checked adb and got the message 'adb drivers not installed' so removed and re-installed adb drivers from Amazon, but I still get same message.

Since removing and re-installing drivers my device in device manager now only shows as 'Kindle fire > Fastboot Mode | HD 8.9. It used to say 'ADB Interface'