yashsingh1/xdaforums huggingface dataset:
[General Questions and Answers] Quaesar:
Hmm, I see. Could anyone explain to me how these proprietary drivers work? I have made many attempts to port CM12 over using EvilP's device tree and kernel but all of them resulted in a brick (lol thank god for TWRP backups :good:). I think this may have been because I just dumped the /system folder for the proprietary drivers (since I had no idea what to do). I'll try once more after I figure out how to extract these little devils but Google turned out to be no help.

Thanks for offering to test out the beta, if I can get something to boot, I'll definitely post it up here. In the meantime, you can try out my surefire brick ROM. I'd r8 8/8 m8 =3

I'll start downloading the CM12.1 source. (12GB downloads await me)

EDIT: I forgot to put this in but anyone wanting to root their device, install TWRP provided by EvilP, then flash the SuperSu zip. That should get you root =D
[General Questions and Answers] :
Yes I had root the slate 21 s100 (phobos) with ubuntu and the comando "fastboot OEM unlock", after I flashed via adb sideload update super su and I have installed twrp recovery.

If your ROM boot up, I will test it. Would be the first custom rom for the slate 21.

Escluse me for my bad english (italianized english)
[General Questions and Answers] Unjustified Dev:
If you need help, I'm more than happy to offer it. I've worked on may Tegra4 devices in the past and present.
[General Questions and Answers] Quaesar:
Thanks man! I'll honestly need all the help I can get =P.

I've already downloaded the CM12.1 source and tried building (again) using EvilP's device trees and kernel. After a lot of trial and error i think its best the we start from scratch on this. [MENTION=4911249]Unjustified Dev[/MENTION], could you please explain to me how to create a device tree/gather all the necessary files required to start building from scratch. Thanks so much for your time, I'm sure all of us here really appreciate it (myself for sure).

As for all the people wanting to be beta testers, please PM me so I can write your username down and you'll be the first people I'll send the ROM to test (once we get it to boot), once we have something stable I'll attach it to this thread for public testing. If we get to the point where it's perfect (I hope we do), then I'll create a new post with the ROM as an attachment!

Let's get going I guess!
[General Questions and Answers] Unjustified Dev:
PM me your email address so we can chat on hangouts. It would not be best to start from scratch. I have a tegra4 tree we can start from. It's based from my work on the madcatz mojo and adapted for slatebook 14 which is a wip and probably the best as the slatebook 14 has 4.4.2 as well and this tree contains all the necessary flags for 4.4.2 tegra4 proprietary files. I'll explain more privately a bit much to type here.
[General Questions and Answers] Quaesar:
Holy crap that was fast lol thanks!

I'll send it to you right away!
[General Questions and Answers] Quaesar:
Beta testers needed!

Thanks to the help by Unjustified Dev, we have been able to successfully port Cyanogenmod 12.1 with some issues.

It would be great if we could get some beta testers to install it and report back on any issues they find.

Current issues are No Wifi, No Bluetooth, No Camera, Brightness will not change

Please PM me with your email address if you are interested so I can add you to the beta tester group hangout!

Thanks,

Quaesar
[General Questions and Answers] Quaesar:
Good News!!!!

Good News guys!, we've gotten Wifi and Bluetooth working perfectly! Camera and Brightness are still not being friendly though :rolleyes:

Microphone works great however (perfect for Ok Google). I apparently do not have enough posts so start a new thread so I'm going to go reply to some threads I'm interested in.

Afterwards, I'll upload the latest TWRP (built by me), and CM12.1.

If you really wan to get your hand on the ROM right now then PM me and I'll send you the link.

If you appreciate my work please hit that thanks button. It keeps me motivated and shows there are people who appreciate my work!

Peace,

Quaesar
[General Questions and Answers] Quaesar:
TWRP

I've uploaded TWRP and included a nice tutorial to go along with it.

http://xdaforums.com/general/general/recovery-twrp-2-8-7-0-hp-slate-21-t3200592/
[General Questions and Answers] Quaesar:
Cyanogenmod 12.1

I've uploaded the ROM with a nice tutorial (again)

Enjoy!

http://xdaforums.com/general/general/rom-cyanogenmod-12-1-hp-slate-21-t3201416
[General Questions and Answers] rpalazue:
Great Job!! tk's

Try now!

Un abrazo!!
[General Questions and Answers] dvirring:
I am stuck with no way to get into fastboot mode etc. Nothing works holding power +volume up or -volume down all just displays

stuck on booting recovery kernel image

Is this thing bricked completely. I have to drivers installed etc on my laptop. But I can't even get into any recovery or anything!!!!!

Please help me get this HP Slate up and running again. It was bricked when I did the official HP update a long time ago. I would love to install just even the stock not rooted rom. This thing is not rooted and the bootloader is locked still. Please help!!!!!
[General Questions and Answers] Quaesar:
I can definitely help, I'm going to pm you some stuff so please check your messages.

Peace,

Quaesar
[General Questions and Answers] dvirring:
Ok thanks I will be waiting for your help! I really want to get my slate 21 back up and running. So hard with no fastboot or recovery working.
[General Questions and Answers] Quaesar:
Just sent PM, check it out.
[General Questions and Answers] bernie sensation:
Hi peeps :)

I too am having trouble trying to install trwp and then cyanogenmod - probably because my slate is foobarred... Fastboot and adb are installed on my PC, i can only get into fastboot however (no recovery - if I try and boot into recovery it just says "booting failed"). through fastbook I can run some commands, it tells me that my slate is already unlocked - I can run the "fastboot flash recovery" cmd and load the recovery image, it reports back that it's ok and the process has finished - However if i try and boot into recovery, whether that be from a cold boot of the slate or straight from the recovery option on the slate screen, or via fastboot... well nothing happens, i'm in the same mess.

I should include however that at one time i could load into the stock recovery albeit with some weird "can't mount cache" messages flagging up. But "big sigh" in my infinite wisdom, i ran the "fastboot erase recovery" cmd and I'm now in what I can only presume to be is an even bigger hole.

If anyone has any advice, it would be greatly appreciated - Even if it's only to tell me to chuck it in the bin - because then I can stop wasting my life on this thing that's slowly driving me insane.... :eek:

Thanks

Bernie
[General Questions and Answers] Quaesar:
Here are some basic instructions:

- Boot to fastboot mode (Vol Down + Power)

- Install my modified bootloader from here: https://www.androidfilehost.com/?fid=24352994023709606

- Use command:

fastboot flash staging /path/to/downloaded/bootloader_Quaesar.img

- Press reboot on Slate

- Wait until you see my logo instead of the HP logo

- Turn off device and go back into fastboot

- Flash my TWRP 3.0.0-0 recovery from here: https://www.androidfilehost.com/?fid=24399994186369430

- Use command:

fastboot flash recovery /path/to/downloaded/TWRP_3.0.0-0.img

- From there you can either install my Cyanogenmod 12.1 build (http://xdaforums.com/android/general/rom-cyanogenmod-12-1-hp-slate-21-t3201416) or revert to stock (https://www.androidfilehost.com/?fid=24367857647223248). Also the stock zip will change your recovery back to stock

That should be all, let me know if you encounter any issues along the way and we can sort it out.

Hit that thanks button if I helped out!

Peace,

Quaesar
[General Questions and Answers] bernie sensation:
Thanks Quaesar - For the support and speedy reply. The slate is under my desk in work, so i will try this when I'm in next on Monday... because it beats doing my actual job. I guess I shouldn't post back with general chit chat, but I really just wanted to say thanks. I've scoured the whole web looking for answers and came up with nothing. So the thought of that there might be a solution to this and that there are decent people out there willing to help is fab.

:D
[General Questions and Answers] Quaesar:
Glad I could be of assistance, I've seen many people with a similar issue because there's an issue in HP's bootloader that screws with fastboot. Installing my modified bootloader should do the trick because it fixes that issue (you'll also get my fancy logo!). That's also the reason why I've made it standard in my ROMs that this new bootloader is flashed. I don't really want anybody getting in the same predicament as you haha.

Peace,

Q
[General Questions and Answers] bernie sensation:
Hi Quaesar :)

So, I downloaded the files and did the following

C:\Users\Administrator\AppData\Local\Android\android-sdk\platform-tools>fastboot flash staging "C:\Users\Administrator\Desktop\tablet\Quaeser boot loader and hp stock rom\TWRP_3.0.0-0_phobos_Quaesar.img"

target reported max download size of 641728512 bytes

sending 'staging' (9256 KB)...

OKAY [ 0.382s]

writing 'staging'...

OKAY [ 0.099s]

finished. total time: 0.490s

The slate is obvioulsy in fastboot mode - the display gives the following options:

start

power off

recovery mode

restart the bootloader

You said in your post to reboot from the slate after loading the bootloader - So, i've tried a power off and then a switch back on, but it just puts me straight back into fastboot mode - I re-flashed the bootloader again and also tried selecting various options from the fastboot menu - but each time, i just end up back in fastboot mode - I do not see your logo, the HP logo always pops back up and then it goes into fastboot.

Maybe it is beyond repair? But if you think of anything else i can do/should try, please let me know.

Thanks again.
[General Questions and Answers] Quaesar:
That's because you followed the instructions the opposite way lol. You need to flash the Bootloader_phobos_Quaesar_4.4.2.img file to staging:

fastboot flash staging /path/to/Bootloader_phobos_Quaesar_4.4.2.img

You also need to flash recovery (Filename TWRP_3.0.0-0_phobos_Quaesar.img) like so:

fastboot flash recovery /path/to/TWRP_3.0.0-0_phobos_Quaesar

Your result tells me that fastboot is set up correctly and the the wire you're using is good. You just flashed the wrong file to the wrong place. Very risky business doing that haha. Good thing your Slate has preventative measures to rejecting the file you flashed. If it accepted the file you sent it would have been bricked to the point where only HP could fix it. Since we have no way to modify partitions in APX mode, anything else would be useless =P.

Just remember, the bootloader is where fastboot lives. You have to flash to staging to modify the bootloader. The recovery is where your recovery boot lives. Take a close read at the instructions I posted before and flash the right file to the right place! ;)

When you're done that, flash my stock package or my CM 12.1 package...your choice.

Just remember my motto in my signature =D!

That should be all you need to know, let me know if you have any more questions or encounter issues along the way.

Peace,

Q
[General Questions and Answers] bernie sensation:
"Looks shiftily around the room :o" - OK... So I'm blaming the mini hangover I had in work on Monday morning when i attempted this... Well... that's my excuse!

Man, thanks for sticking with me on this anyway, it's much appreciated.

So i tried it the correct way :good:

C:\Users\Administrator\AppData\Local\Android\android-sdk\platform-tools>fastboot

flash staging "C:\Users\Administrator\Desktop\tablet\Quaeser boot loader\Bootloader_phobos_Quaesar_4.4.2.img"

target reported max download size of 641728512 bytes

sending 'staging' (7137 KB)...

OKAY [ 0.297s]

writing 'staging'...

OKAY [ 0.141s]

finished. total time: 0.446s

But it's still the same issue - I don't see your logo and I'm stuck in the HP fastboot. I've tried flashing the bootloader... and then all number of things, as in your instructions you said to just press reboot on the slate after flashing the bootloader, well it was a bit vague for me, as i'm not sure where the reboot is - so i've just tried - switching on/off, selecting various options from the fastboot menu etc. I've also tried flashing the recovery right after I flash the bootloader - but to no avail.

Should we think about changing this? :p

Or maybe actually throwing a brick at it!!!!!
[General Questions and Answers] Quaesar:
I think just skip the staging part and just flash the recovery. You can also send me a message over Hangouts at quaesarxda@gmail.com and you can send me pictures and whatnot, I'll be able to directly help you then.
[General Questions and Answers] bernie sensation:
Thanks for the help so far Quaesar. I don't use hangouts but i'll figure it out and be in touch :)
[General Questions and Answers] Quaesar:
Sounds good. Hangouts is a messaging app by Google in case you don't know. I use it frequently with other Devs and beta testers. I'm sure it'll be much quicker to fix up your Slate using real-time chat haha.

Waiting for you to send me a message…

Peace,

Q
[General Questions and Answers] ConfuciusTse:
Thanks guys for working on this device. Any chance the HP Slate 1 PRO is going to get any love? Great hardware...terrible HP support.
[General Questions and Answers] Quaesar:
Working on CM12.1 for it right now. Check out my TWRP 3.0.0-0 thread for the Slate 21 Pro (ranger), I'll post any updates there.

Peace,

Q
[General Questions and Answers] UAS specialist:
Okay I down graded to kit cat, and now I'm back on Jelly bean where it all started... Hp 21 slate K100 model testing new versions of DJI GO app & DJI Lightbridge app (I fly Drones) so I use these apps which allows the video that is injected over USB to be displayed upon the screen as my viewfinder. I use these apps all the time for work, It's great to have a big screen, wish it worked better out doors, Are interested in building a really good out door android display that can be used in direct sunlight, I have this K100 built into a case using portable battery for powering this bad boy,I made a good sunshade for it.
[General Questions and Answers] Quaesar:
Sounds like a nice setup, cool to see the many uses for this sort of device
[General Questions and Answers] jonathanjr321:
hey guys i need help please with HP slate 21 k-100 (4.4.2) NVIDIA TEGRA 4 I root with kingoroot but i can not unlock bootloader (fastboot oem unlock) not working for my always say FAILED :(
[General Questions and Answers] jonathanjr321:
thanks anyway is done
[General Questions and Answers] rohit3192:
Need help.

I have downloaded jellybean original zip file as posted by [MENTION=4772678]evilpfeiffers[/MENTION], i am on 17r25_011.11

But i am unable to apply zip file from stock recovery as it says fails to mount /sd card.

I don't have pc right now to install twrp.

Is there a way to go back to previous stock rom?
[General Questions and Answers] noo100:
Format SD Card to a Different File System. NTFS or FAT.
[General Questions and Answers] xdasoy:
Can't get HP Slate (not Pro) to update OS

Relative newbie here, but I've successfully installed CM into HP Tablets in the past after researching the hell out of each step.

The Slate preinstalled OS is unstable (crashes, hangs, pop-up error msgs), so been trying to update it to ANYTHING BETTER (best bet is CM 12.1 from Quaesar, seems?) But this Slate is KILLING me...! The device NEVER boots up properly anymore, so I can't seem to get my Mac to see the Slate: It almost always stays on the swirling screen indefinitely. Once a week, after rebooting it regularly, it may pass this screen but then gives an unrelenting "UI has stopped working" error.

I was able to run "fastboot oem unlock" once last week when the device was seen by the Mac. Not sure if it worked.

I am able to get to Fast Boot Mode, but I cannot get "ADB Device" to show the Slate as connected any longer, so can't proceed to trying to install TWRK.

Help, please.
[General Questions and Answers] Concato:
Root HP Slate 21 android 4.4.2

I`ve been working hard, and finally found THE HP SLATE 21 ROOT!

google > Kingo Root android 4.4.2

it don`t need a PC and it`s just a APK and really work! download de ROOT Checker and the result is positive!

Enjoy! :cool:
[General Questions and Answers] maniaa:
hp slate 21 s100 rooted

Eureka
[General Questions and Answers] naphrosawyer:
can i flash twrp via sd card?

is there any method where i can install the custom bootloader/recovery/rom using just SD Card? I tried installing the stock HP 4.4.2 OTA it installed correctly but now it just sits at "Installing Applications" screen, stuck. i tried reinstalling, factory resetting, wiping data/cache, etc. none is working and I cant seem to get my computer to recognize the K100 I'm assuming because I cannot enable USB Debugging.. cant get into the OS someone HELP!!
[General Questions and Answers] bululu:
Wasn't it Kingo root that shipped malware together with root?
[General Questions and Answers] ddvo:
Need help whith bricked(?) HP Slate 21

Thanks a lot [MENTION=6847973]Quaesar[/MENTION] for your instructions and the various images and zip files you provided at https://androidfilehost.com/?a=show&w=files&flid=39411 for the HP Slate 21!

We still have such a model, and after not using it for a couple of years we'd like to revive it since it would be perfect an easy-to-use live wall paper in a pleasant frame.

Unfortunately it always got stuck while booting the system. The only thing I can access is the boot loader. That is, also the recovery mode does not work, and I'm stuck at using fastboot.

I've spent hours trying to flash various boot loader and recovery images, including those that you provided, but all this had basically no effect.

I even tried flashing the system image directly. I only found zip files for it, so I converted some portions of system/ directories to .img files using

make_ext4fs -s -l 805306368 -a system system.new.img system/

and was able to flash them, but then the system did not boot either. Unfortunately no error messages are shown at this stage that might be helpful to find out why.

So far trying to boot or to restart the boot loader or to switch to recovery mode always lead to a frozen state, from which I could recover only by a hard reset or power off.

Eventually I even erased all partitions. This somewhat 'helped' in the sense that attempts to boot, to enter recovery, or to restart the boot loader now cleanly fail and I'm immediately back to the stock boot loader.

On the other hand, I meanwhile regret having erased also the radio partition because later I found that none of the images and zip files available appear to contain an image for that partition.

Where could I obtain a copy of the (stock) radio partition image? [MENTION=6847973]Quaesar[/MENTION], do you still have your phobos and can provide a backup image of it? Ideally also of the system, as .img files?

What could be the reason why flashing whatever recovery image (such as Stock_HP_Recovery_phobos_4.4.2.img) appears to work fine, but then still entering the recovery mode fails?
[General Questions and Answers] gladimir thomaz:
sim
[General Questions and Answers] gladimir thomaz:
esta desatualizado
[General Questions and Answers] hetzbh:
Few things:

1. IIRC correctly, the device names are a bit different compared to what you shows on the link (http://whiteboard.ping.se/Android/Debian) - so be careful.

2. What I don't see there, is what happend to the recovery partition. Are you planning to entirely delete your slate 21?

3. If this works for you, could you make an images?

Oh, btw, have you managed to install CWM?
[General Questions and Answers] xdaca:
Of course, that is also clearly mentioned in the article.

Recovery is not touched. Just like in our rooting method the only partition touched is the boot partition. The difference is that now it will have an initrd that will transfer control to a Debian image on the external sdcard. The init there will just spawn a sshd and transfer control to the initrd we are currently using but is now hosted in an Android chroot on the Debian image. That initrd in turn will mount as usual the system, data and cache partitions that already exist on the internal memory but they will now also live inside the chroot on the Debian image. It is pretty nifty. Full control over everything and as an added bonus, if something goes wrong in the Android initialisation (boot loops), you can ssh in and fix things. (which is what I ment with alternative recovery)

That doesn't make sense. As far as I know there is no CWM for the phobos (which is the codename of our Slate 21)
[General Questions and Answers] IET_DEMO:
So you've found a way to root it?

Are you going to do a tutorial? I am pretty noob in the rooting world. :confused:

My HP Slate is unlocked and that's pretty much all I could do for now.

I tried the moborobo root method and I'm currently stuck in this tutorial whiteboard .ping.se/Android/Rooting

I can't get the bootimage, can someone explain how to do it?

Any help would help!
[General Questions and Answers] xdaca:
You can extract it from the rom image you can download from HP support site.

HTH.
[General Questions and Answers] IET_DEMO:
Thx for the info! :)

I've followed everything on the tutorial (whiteboard.ping.se/Android/Rooting) and it did'nt work.

So I tried the "It didn't work ?!" part. When I execute /sbin/rootsh +p from the adb shell it says I don't have the permission.

So I tried to do fastboot flash:raw boot zImage insecure_initramfs.cpio.gz like [MENTION=5563292]xdaca[/MENTION] proposed.

When rebooting I got stuck at the boot logo. I could restore it to original image but I'm still not root.

Any advice? Or can someone give their own image?
[General Questions and Answers] xdaca:
Yes, that part is necessary. My wild guess is you have messed up somewhere with setting the permissions on /sbin/rootsh

Other than trying again? No.

If you have a bit of patience, I have an idea for building a bootimage you can just flash and that will do all the work for you. I might give it a try this weekend. I'll keep you posted.
[General Questions and Answers] IET_DEMO:
Actually I think I got it!

I've manage to do /sbin/rootsh +p.

I will try more monday but the biggest part is behind me.

Thanks for your help everyone!
[General Questions and Answers] QLink:
This would be really awesome !

Any good news for us bout your bootimage ?
[General Questions and Answers] IET_DEMO:
Hello guys,

as I said I'm back with some news.

I have been able to successfully execute the /sbin/rooth +p command.

I got the "#" so I did the next steps:

shell@android:/ # mount -ro remount,rw /system

//I tried the version 1.89 and 1.93 of SuperSu

c:\android>adb push su /system/bin

c:\android>adb push Superuser.apk /system/app

shell@android:/ # mount -ro remount,rw /system

shell@android:/ # chmod 06755 /system/bin/su

shell@android:/ # chmod 0644 /system/app/Superuser.apk

shell@android:/ # chown 0:0 /system/bin/su

shell@android:/ # chown 0:0 /system/app/Superuser.apk

shell@android:/ # reboot

But when I tried to open SuperSU, it told me : "There is no SU binary installed, and SuperSu cannot install it. This is a problem!".

I went to /system/bin and su was there.

If I execute su in the terminal I have no errors but I does nothing.

Ex:

shell@android:/ $ su

su

shell@android:/ $

Any advice?

------ Edit -------

After trying different things, I've found a solution.

I used the version 1.93 of SuperSU su binary and uninstalled SuperSU from /system/app.

c:\android>adb push su /system/bin

shell@android:/ # mount -ro remount,rw /system

//For me, 06755 didn't work, so I looked at the permission of the su binary of my GalaxyTab 2.

shell@android:/ # chmod 4755 /system/bin/su

I installed SuperSU from the Market and it worked!