yashsingh1/xdaforums huggingface dataset:
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] mdfarazb2:
Oh no bro..I mean by "numbers don't matter" that You cannot say of a device capability by just an Antutu score... What if scores comes about 100k and still phone lags ....So I meant to say that It's all depends on the kernel and the Os Optimization...:o
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Alok Bajaj:
I agree to that :) My xperia tablet scores 35k on AnTuTu but plays Modern Combat 5 very well. In Le2 it's not up to the mark what its CPU and GPU can handle. Hopefully this custom kernel can help. But I didn't see any significant change in CPU and GPU optimisation. CPU and GPU never stay stable to desired frequency values. Waiting for updates :fingers-crossed:
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] mdfarazb2:
Right!!:):svetius:

And yes.. just wait for CM and further updates of this Awesome kernel... DAMN! THIS PHONE WILL ROCK!!!:laugh:
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Alok Bajaj:
Yeah, right! Waiting for CM14.1:silly:

---------- Post added at 05:18 PM ---------- Previous post was at 05:07 PM ----------

One request to Devs. Please enable controller support in kernel. Serious gaming going on here :D
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Brawn_Sg:
intentionally didnt included this feature

that no one will use it

will enable it in next build
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] alizain2308:
Why asking these questions to a "genius" who has zero contribution for this phone. If he really call himself a genius he would rather make his work speak for him.

"Empty vessel make more noise"
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Alok Bajaj:
Thanks :)
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] zeetwo-raj:
Hey devs pls solve the volte issue in miui8 beta..really great fan of miui.
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] ulkika:
two tests in quick succession with AnTuTu to show that the numbers are not everything ..... but sometimes count ... my device does not riavvie and functioning optimally despite being a X527

Screenshot_20161215-090908

Screenshot_20161215-091457
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Alok Bajaj:
One more request... Need "ondemand" governor for GPU.
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] debasish497:
any progress from the CM 13 end?
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] unnilinux:
few issues i found:

the mac address changed.

And both the imei numbers are shown as same.
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Alok Bajaj:
Devs please fix this issue. This is the worst thing I hate about LE2.

CPU frequencies are so stupid :(
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] ulkika:
how many time for new relase of kernel?
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Brawn_Sg:
3-5 days max brother

actually i am not getting much time

moreover my prime focus is on cyanogenmod 13 bringup

hope u understand

thanks
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] ulkika:
My today value after a reboot
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Alok Bajaj:
If Devs could implement vulkan we can get a lot of GFX power :)
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] mdfarazb2:
Bro....CM first priority?????
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] debasish497:
is this happening for you only? none reported this issue.
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Alok Bajaj:
My IMEI numbers are okay :)
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] TDINater:
Would it work for the S3 (USA) SNAPDRAGON
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Prathamesh Kapure:
Which is the best governer and I/O for best battery life and little performance...? :confused:
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Alok Bajaj:
Refer to this link:

http://androidmodguide.blogspot.in/p/io-schedulers.html?m=1
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Prathamesh Kapure:
Yeah bro thx bt i was asking for personal recommendations...
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] piku 123:
CPU Governor:Impulse

I/O Governor:SIO

But i haven't flashed this kernel yet so don't know if this kernel have these governor.
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Prathamesh Kapure:
Thx bro... But both governer and I/O is not available in this kernel.. :confused:
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] piku 123:
PM Dev to add them may be in future he will have them.
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Prathamesh Kapure:
Ohh yeah.. Thx bro...:D
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Brawn_Sg:
they r available

check properly

with kernel auditor app

be rooted
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] bdogz24:
Impulse governor and sio scheduler are not there.
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Eziogamer:
Howw is the battery backup? How much screen on time and standby time are you getting? Nd also on which type of usage ie; whether it include gaming and all..

Thank you
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Alok Bajaj:
I used lspeed app and enabled kernel sleeper optimizations. And battery dropped just 1% overnight. And in gaming it gives 4-5 hours of battery backup.

Downside is.. gaming performance is not that great! It maybe the issue of EUI. But GPU is stuck on 480MHZ and never goes beyond it even if I'm using performance governor. Same with CPU. It gets underclocked even if the phone warms up slightly.

Hoping for more optimizations in kernel. And of course the release of Cm :fingers-crossed:
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] lesterjoel123:
Kind of a noob question

But how do you enable the features through kernel auditor?
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] piku 123:
please report this through le eco feedback app.
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Alok Bajaj:
They're not going to do anything about it. I'll wait for CM.
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] piku 123:
Install kernel auditor >grant root permission>open kernel auditior(You will find various section for GPU,CPU,I/O etc)

Be careful though don't change settings blindly.
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] piku 123:
I reported this with feedback app lets see what they are saying.
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Alok Bajaj:
Great! They'll reply like this... And then just forget it.k
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Brawn_Sg:
good things take time

eapecially when the dev is a noob

status : booting

will post soon

thanks [MENTION=4978710]jhakjhuk1853[/MENTION]

fo supporting me and obviously testing it

press thanks if i helped

or donate if like my work too much :p
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] mdfarazb2:
maaaannnn!!!!!!!?????????????
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Ayush Kumar Tarun:
Is CM accompanied by your updated kernel?
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Alok Bajaj:
Wow! ?? Soon in our devices too ? Thank you so much guys ???
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] sad1968:
Brawn_Sg

Many thanks for your work
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] jhakjhuk1853:
Those who really want to help us

Like this Individual post

And alsi opening post

This likes really matter

And yeah bdw I am testing this rom
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] sp7759:
does this kernel work on the x620 variant of the phone?
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Alok Bajaj:
Nope. It's for Snapdragon version of Le2.
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] unnilinux:
That was definitely an issue. Flashed eui 20s and everything back to normal now
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] veer.killerboy:
What bugs are you facing in cm 13 build??
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] sp7759:
wheres the x620 support man????
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] ShawnMercer:
After using 2 days with 5.9.020s version rom and this kernel i would say this kernel is very good, i don't know if its Rom or this kernel but i am getting much better battery backup from 5.9.19 official rom..

Thank you! :)
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Ayush Kumar Tarun:
Any updates on the kernel?
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] mdfarazb2:
devs are currently busy on the cm 13 I think:)
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Prathamesh Kapure:
Guyz i have a Tp link router for hacking purposes.. When i try to connet ut to my Le 2 nothing happens.. :crying: Maybe due to stock kernel so i fhashed this kernel but still no use.. :confused: Can anyone plz help me.. I want to use it in linux for hacking Wi-Fi.... Thx in advance.. ;)
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Prathamesh Kapure:
Also can anyone plz try to port MIUI camera...coz Eui's camera sucks a lot.. .??
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] ulkika:
this kernel dont evolves?
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] jhakjhuk1853:
soon

new kernel soon

---------- Post added at 12:26 PM ---------- Previous post was at 12:24 PM ----------

everything is buggy

---------- Post added at 12:27 PM ---------- Previous post was at 12:26 PM ----------

soon stay tuned
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] slayer2007:
Is it possible to make sound louder?
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Cuvillier:
can be installed for x620 ?
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] jhakjhuk1853:
No
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Cuvillier:
Too bad....

Anyway, thanks for good support
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] popo72:
Hi [MENTION=5938667]Brawn_Sg[/MENTION]....really thanks for your great work....

Could be possible to know what to modify into kernel to preserve the correct display scaling factor after removing userdata encryption?

Thanks in advance
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] ulkika:
we have understood the message that the Rom CM priority, but now that you have made 2 would not have the time to devote to a kernel with more power?
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] ramsanath:
Did anyone try this with lineage os?
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Ayush Kumar Tarun:
No more updates for the kernel?

Was waiting eagerly for coming features.
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] mdfarazb2:
AndroModX is coming bro...:)

Stay tuned
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] jhakjhuk1853:
Update to kernel is soon

Including support to cm13
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] danishdvn:
bro iam waiting for ur andromodx kernel.
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Rishabh Rao:
It's AndroModX not Qassam

It's already released

Check AndroModX post

Cm13 support release will be added soon
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] ulkika:
there isn't update of andromodx...only 1.0
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Rishabh Rao:
That's what i said!!

Lineage support yet to be added!!!!
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Brawn_Sg:
Qassam final 2.0 in a week

There will be 2 variants

Cm version

Stock version

I don't have the device now so will require testers

Can also compile ROMs if people want

Thanks
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] mdfarazb2:
Wow..TQSM BRO!!

BTW Dirty Unicorns would be AWESOME if you can:laugh:?
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] danishdvn:
bro can we expect overclocked stable GPU in next update of Andromodx or Qassam kernel?
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] aravindanxda:
?? We are waiting dude
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] venreddy:
[MENTION=5938667]Brawn_Sg[/MENTION]

Would there be any update for this kernel?
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] piku 123:
Turn off all thermal driver in kernel auditor.
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Alok Bajaj:
Already done that. But no difference.
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] piku 123:
Then it must be ROM or kernel not sure.
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Alok Bajaj:
Thanks. But I already know that and a discussion on it has been done couple of months ago ?
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] diazabdulm:
It's working on Lineage OS 13 for X620. Great job, Brawn_sg.
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] RazZzeR:
Stock 5.8.019s is way better than any other stock and with this kernel it's rocking my Le 2 device .......Thanks for support device
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] piku 123:
What CPU and I/O schedulers this Kernel have?
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] aman.k.sharma.best:
It's this kernel compatible with lineage OS 14.1?
[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] Achyuth Reddy:
No Bro.... It's not working in any nougat version...I have tried it on myself and my device was stuck at bootlogo...again i restored the original kernel using AndroidModX's aroma installer... :P
[XDA Assist] pinnekeshaar:
Hi,

So I've been getting into android the past month and really started liking it. I have however some questions about how an android (or Linux) operating system works. I also have some questions about how the Kernel and the OS work together and what I need to know about it before I start learning more about and getting into developing.

1. Does the Kernel command the OS or the other way around?

2. Can I create a custom Kernel specifically for an OS?

3. How much experience do I need to create a custom Kernel and is it phone specific in the sense that if I make Kernel A for phone A will it be easier to create Kernel B for phone B?

I'm not native speaking, so please ignore any grammar issues.

I'd love to hear something from you all!

Kind regards,

Pinnekeshaar
[XDA Assist] Vatsal:
Hello,

1) Yes

2) Yes

3) You really need to have an in depth knowledge of your device, linux kernel and you should know how to use git. Depending on how you want to get started, you can add more governors, hotplugs, upstream updates and more..

Regards

Vatsal,

Forum Moderator.
[XDA Assist] pinnekeshaar:
Thanks for your reply and also aswering my questions. I have no more questions.
[Nexus 6P Q&A, Help & Troubleshooting] stuff:
I am having constant modem crashing and restarts when using Chrome (official) with Android 7.1.1.

I'm not sure what is causing it, but I've reflashed and it still occurs.

I've included the dmesg. I looked through it and can see where the crash occurs (around line 2040) and the next few lines indicated restarting of the modem.

Any clues as to why this is happening?
[Android Q&A, Help & Troubleshooting] slapshot13:
Hi,

I believe my nexus 5x is "soft bricked" or in a "boot loop" (sorry newb here). The phone will restart and turn off during the boot animation. I am able to get into recovery mode and have attempted to use adb sideload to apply the latest 7.1.1 OTA zip from google's website. During that process (50% through) it said I could not update it because I needed to load a current or newer version. I realized I am on beta 7.1.1 NPF26F but am unable to locate the OTA zip for this.. I did download one online (seemed legit) but got an error E: signature verification failed, E: error 21. At this point I am a bit lost and unsure what to do.. any help would be appreciated.

Mike
[Android Q&A, Help & Troubleshooting] es0tericcha0s:
Is your bootloader unlocked? If so, then just install the whole system update, not just the OTA. This will get your off of the beta and onto the official update as well.
[Android Q&A, Help & Troubleshooting] slapshot13:
I do not believe my bootloader is unlocked. I tried to go through the " fastboot oem unlock " steps today but I need to turn on USB debugging on the device (which I cannot do) to even have that option. Will I need to wait until the OTA.zip is released or is there another way ?
[Android Q&A, Help & Troubleshooting] es0tericcha0s:
http://storage.googleapis.com/andro.../preview/bullhead-npf26f-factory-0e9ab286.zip
[Android Q&A, Help & Troubleshooting] slapshot13:
is this the factory image or the OTA?.. guessing by the size its the factory image. I am unaware how to flash this if my USB debugging is LOCKED. Please help
[TouchPad General] GarrusN7:
After a few months of testing, changing settings and intense anger, I found the fix for the error....and what is annoying the most the the simplicity of the fix.

The fix for this is the locale setting in the exe settings in the ExaGear. You change it from UTF8 to en_US.

I haven't checked it for Conquest yet since I came by that with chance so....I will see tomorrow how the fix works for that too.

ALL HAIL LELOUCH!
[Tilt, TyTN II, MDA Vario III Windows Mobile ROM De] Vrast:
Hello,

first sorry for my english (i'm french)

I have à TytnII sfr V1615 with illimytic sfr (i can upload for free all the music we want on live.vodafone.com), i flash my rom with HTC rom and now i can't upload music (upload failed).

i've instal HTC_vodafone_live.cab but the probleme as the same :(

Wath can i do ?

Thanks
[Tilt, TyTN II, MDA Vario III Windows Mobile ROM De] PsyberEMT:
I had the same problem with Napster here in the U.S. after a reflash. Before attempting to upload music, open windows media player, and setup a sync relationship with your storage card, then close WMP and try the upload again. Worked for me.
[Tilt, TyTN II, MDA Vario III Windows Mobile ROM De] miralles_mp:
je cherche rom HTC pour v1615 OU PUIS JE LA TROUVER ?
[Fire General] DB126:
FYI - early indications 5.3.2.1 -> 5.3.1.0 rollbacks are problematic.

http://xdaforums.com/amazon-fire/general/fireos-5-3-2-arrived-t3500922/post70052733
[Fire General] amerkiller1995:
Here as well

http://xdaforums.com/amazon-fire/general/fireos-5-3-2-arrived-t3500922/post70061090
[Fire General] kaysond:
Bricked mine too. It shows up as a USB COM port and spits out "READYREADYREADYREADY" until it disconnects itself. I think this means it should be possible to restore 5.3.2.1 via sp flash tool (or maybe another serial loader). If we can get the right files

Attached a scatter file I found online for the MTK8127 chipset, which fire has. No idea if it's right. SP tool for some reason won't keep the com port open...
[Fire General] sd_shadow:
scatter files haven't worked, with any firmware versions

---------- Post added at 05:50 PM ---------- Previous post was at 05:47 PM ----------

see http://xdaforums.com/amazon-fire/development/unbrick-fire-7-5th-gen-downgrade-t3388747
[Fire General] dmerillat:
Yeah, I got the READYREADYREADYREADYREADY brick that I was expecting. Three tablets, got two of them rooted and OTA blocked, then had an emergency and the third apparently wasn't actually Off so it happily ****ed me.

There's never been a recovery from the READYREADYREADY firmware loader, I'd assume? Deciding if I should keep or toss this one. At least this ****'s cheap since we don't actually own it.
[Fire General] komi_9:
I just got an Amazon Fire and am new to this whole thing. Ultimately I'd love to root it, and install a different ROM. But in the short term, I'm just playing with installing the Play Store and turning off lock screen ads. Anyway, I just opened the package up today, and I let it update itself to 5.3.2.1 before I was aware that this might cause me trouble.

I did download the SuperTool here:

http://rootjunkysdl.com/files/?dir=SuperTool

I successfully installed the Play Store. I next tried disabling the lock screen ads, but the tool said I would need to root first. When I selected the option to do that, it asked for my FireOS version, but didn't give 5.3.2.1 as an option. So I'm afraid to go through the root process.

It sounds like downgrading to an earlier version will brick this. What about rooting it with a tool like the one I downloaded? Is that likely to cause trouble as well? Is there much I can do with this currently?
[Fire General] steve8x8:
There's no known way (yet) to flash 5.3.2.1 back to something earlier, that's true (and some who got hit by a brick will confirm).

There's also no known success (yet) rooting this, but since KingRoot is evolving, there may be hope. There are multiple releases of KR around, and the cloud part (where the methods are kept) seem to be constantly changing - if you decide to keep the Fire, you may as well spend some time trying to get it rooted... KR versions 4.8.5, 4.9.2, 4.9.6 have been suggested; if you decide to use KR 5, you will have to remove it from the list of device administrators before replacing it with SuperSU - of course only if you're successful. We're all waiting for RootJunky to release a new SuperTool that will possibly automate this - ATM Nov 29 is still the latest version available...
[Fire General] komi_9:
Does the RootJunky SuperTool just use KR under the hood? I'll have to keep an eye on this. I don't mind getting my hands a bit messy on this, but I don't want to be blazing a new trail. I'm not experienced enough with it. I don't mind waiting a bit to get some hand holding. :)
[Fire General] steve8x8:
It does:

$ grep -ri kingroot.apk .
./1-Amazon-Fire-5th-gen.bat:files\adb.exe install -r apps\Kingroot.apk
./3-Amazon-Fire-5th-gen-linux-mac.sh:	sudo $ADB install -r apps/Kingroot.apk

SuperTool is a zip file - and the "magic" is done in human-readable scripts (bat or bash). Firmware bin files are zips too. Open them in your fav archive tool, and inspect what's inside.

tl;dr: ST installs whatever you put into apps/Kingroot.apk - watch out for Spelnig when replacing the version coming with ST with another one you have dl'ed from apkmirror.
[Fire General] sazinas:
hope this works! Thanks for the good work guys
[Fire General] kaysond:
I'm fairly certain you can still write to the flash memory from that loader, just a matter of figuring out how. There's a python script that I think will work as long as you figure out what to write...
[Fire General] Sparksys:
So..there is no way to Root or downgrade 5.3.2.1??
[Fire General] steve8x8:
At this moment there isn't, sorry. But tools are not static, and there's even the chance that a future fireOS upgrade will be easier to root. You've got the choice to return your Fire while/if still on warranty or wait for better days to come.

Edit: I have read rumours that KingRoot would now be able to root 5.1.3 - this, of course, may be due to the usual number confusion (and 5.3.1 was meant).

On the other hand, the patch level of 5.3.2.1 might not include DirtyCow attacks yet:

ro.build.version.security_patch=2016-10-05

and indeed I saw RootJunky add some DC stuff to his download site... There might be something around the corner, indeed.
[Fire General] Chris X.:
Confirm, even hardbrick if flash from 5.3.2.1 to 5.3.2
[Fire General] rallison203:
I just used the supertool on the same model Fire tab, on 12/27/16. Here's what I've learned:

1. Amazon will indeed remove offers/ads from the discounted Fire, without cost, if you ask.

2. Supertool uses KingRoot, as of my download date.

3. Supertool was not successful in removing ads, but did install the Play Store. It did prevent OTA updates, but the root didn't work for me, so I reloaded original firmware and of course it updated right away. Next time I would try to root after registering my Fire with Amazon.

4. It aopeared to me that the Supertool attempted a downgrade (5.1.1?) before rooting, so if downgrading will brick a device running 5.3.2.1, then I think the answer to the OP's question is "no".

related question: Knowing all the above, can I still re-try the Supertool option #1, and (re)install the Play Store and remove ads? (I bought 3 of them Amazon removed ads on 1 of them so far.))
[Fire General] DB126:
- SuperTool does not attempt a FireOS rollback

- 5.1.1 refers to underlying Android build

- Amazon will (reluctantly) remove ads from ONE device registered to an account

- KingRoot works best if device is NOT registered with Amazon

- at present KingRoot is not effective against FireOS 5.3.2+