[Kindle Fire HDX 7" & 8.9" Android Development] vrt0r:
Hello,

thanks i will try this. I ended up installing cm11 in stock and it worked .

The kindle's are from my sons, so i have another one and will try your solution on the other.

Here is what i did and some improvement suggestions:

I almost f***** up, so maybe someone can learn from my errors.

The Kindle (7" HDX Thor) was on 13.4.5.4 and i decided to give the downgrade a try : http://xdaforums.com/kindle-fire-hdx/general/rollback-13-3-2-8-rollback-ota-captured-t3046204

It worked without problems and like mentioned there i downloaded the 13.4.5.2 from this board and installed.

Then i tryed to install safestrap ( http://xdaforums.com/kindle-fire-hdx/development/recovery-safestrap-v4-0-1-t3137840 ) Be carefull here, like they write here it works only with update-kindle-xx.4.5.2_user_452004120.bin and if you download from the stockrom thread you will have 452004220.bin

I didn't notice that, but luckily i had no brick and managed to start over and use the right stockrom (4120).

Safestrap worked and i did my next f*** up, i made an backup and for "safety" reasons copied it to my PC by booting to fire os and copy via usb.

Great idea so far but i deleted the backup from the kindle because it was 1gb and i thought it's a good idea to save space.

Back to safestrap i started to flash the nexus rom and i did this accidently on the stock rom (holy s***, the warning that u install in stock-slot should be MUCH more visible!)

Beeing unable to boot to nexus and overwritten my stock rom and the given the fact that mount as usb doesnt work (should it?), i thought the kindle is now really bricked.

But i didn't give up and flashed the nexus rom to slot 1. Luckily it booted, but USB doesnt work and i still can't get anything (the backup) on the kindle.

After messing around with the adb driver installation (a pain in the a**) i finally got an adb connection to the pad with booted nexus rom.

With adb push i managed to get the backup back on the kindle and restore it in stock rom slot.

Personally i think a real good idea would be to integrate WIFI and a ftp server to safestrap.

This would make sure that whatever u did you can always put files (roms) on the pad and would improve the security a lot.

If i wasnt lucky enough to get nexus booted on second slot i would have no option to put anything on the kindle because for adb you need a rom that boots.

Or, even better, a possibility to start adb, then you can at least always use adb to put files on the internal storage.

I use the secondary slot for the stock rom now. I need it because i can boot to stock rom for copying files over usb to the pad.

Im still interested if it's somehow possible to access the img files from the custom rom's in secondary slots, but i think it's not possible with safestrap alone.

I created a small partition (2gb) for the secondary slot to put my stock rom in and had the feeling there was much less space left then there should be.

But if i understand you right the stock slot should always use all the space and if u create a slot it will be created in the filesystem of the stock slot.

That makes sense and maybe i may be just wrong about the missing space after creating the secondary slot image.

Anyways, i have problems with the touchscreen. It's very unresponsive sometimes, then again works perfect.

I first thought it's cm11 but i had it even in safestrap, so i think it's a problem with the kindle. :(

Thanks to all contributors for their hard work, you do an amazing job. My Kids really love both roms and they have finally their own "real pad".

The limitations of the kindle (Instant video not working with freetime, and 100 other things) and the missing google play store made them hate their kindle a bit more every day.

Amazon should really rethink their strategy, i want buy again anythink with fireOS on it.