yashsingh1/xdaforums huggingface dataset:
[Android General] smartmanvartan:
probably not.. I've so far tried various fastboot commands fastboot oem unlock fastboot flashing unlock and different variations.. fastboot oem lock works great lol... I've tried editing my build prop to use a nexus bootloader unlock app but that didn't work.. been trying to flash older versions of the firmware despite it having bricked my device before... got the kitkat rom installed on it but it didn't boot and almost bricked it again but was able to flash my preloader back and then the original firmware .. I'm pretty sure our way out is with the fastboot oem unlock command or rather an exploit using that command or a variation of the command i haven't tried yet. all other avenues are long shots. that's where I'm at
[Android General] jerryvail35:
Well then. Guess im going to try some adb commands and see if i can get in that way
[Android General] smartmanvartan:
how? thats the other block with this device.... no adb... Have you been able to install a functional adb driver on your pc or linux distro? if so please share...
[Android General] jerryvail35:
just minimal fastboot+adb. and as far as the driver its just an android adb interface driver by google inc. only works for fastboot.
[Android General] Bogram:
From some searching I've done it sounds like the volume buttons not working for oem unlock is a lazy way of preventing unlocking by disabling the keypad driver in fastboot. (Source: google "littlekernel disable keypad", I'm not allowed to do links yet)

I also seem to remember someone saying to uncheck the preloader when flashing new roms on mtk devices to avoid permanent bricking. It wasn't mentioned but I'd imagine that if there's signature checking involved the new rom would only boot if's bootloader was signed with the same key as the original rom's one. (If I find the source for this again I'll edit it in.)
[Android General] vampirefo:
There is always the possibility the bootloader is already unlocked.
[Android General] smartmanvartan:
I like your optimmis however from what I understand of the OEM unlock command, if it were already unlock, it would return and error instead of the dialog asking for confirmation for the unlock.
[Android General] vampirefo:
No it won't return an error, it will act just like it would if locked, My cell phones uses oem unlock.

fastboot oem unlock brings up same exact message everytime even though it's unlocked.
[Android General] smartmanvartan:
I'm gonna tinker with the method used on this device... it shows some potential on ours...

http://xdaforums.com/meizu-mx/general/tutorial-bootloader-unlocking-mx4-m1-t3201715
[Android General] jerryvail35:
https://www.codeaurora.org/blogs/little-kernel-based-android-bootloaderhttps://sturmflut.github.io/mediatek/2015/07/05/mediatek-details-little-kernel/
[Android General] smartmanvartan:
http://androidforums.com/threads/c5155-cwm-6-0-3-7.936592/

http://xdaforums.com/kindle-fire-hd...ol-signing-tool-pre-3-2-4-booloaders-t2992435

---------- Post added at 10:58 PM ---------- Previous post was at 10:47 PM ----------

@vampirefo I'm gonna make a phils touch for our device and flash it. worst case, i'll just reflash stock firmware... I'll humour the possibility of the bootloader being unlocked.
[Android General] vampirefo:
You don't have to do that just unpack stock recovery make one change to it repack and flash via flashtool, boot into recovery if you can bootloader is unlocked.
[Android General] smartmanvartan:
It's really not that difficult and it will be done...

http://xdaforums.com/devdb/project/dl/?id=14324
[Android General] vampirefo:
Upto you.
[Android General] smartmanvartan:
so it's locked. An other thing I dont quite get is that fastboot is incomplete. I should be able to boot into a recovery using the "fastboot boot recovery.img" command but it always returns as remote unknown command.
[Android General] vampirefo:
fastboot boot recovery.img hasn't worked since jellybean.
[Android General] smartmanvartan:
Been out of the game a while...
[Android General] vampirefo:
So you can't flash modified stock recovery.img correct? via flashtool.
[Android General] smartmanvartan:
When I flash anything modified, it loads a white screen. I was able to load a stock recovery from another firmware version but that's that's as far as It goes.
[Android General] vampirefo:
I would expect it to just boot normal, not white screen, usually white screens means the image wasn't correctly repacked, but rca tablet might react differently. No matter it doesn't boot into recovery so that's a dead end.
[Android General] smartmanvartan:
Depending on which version of stock recovery I use, it reacts differently too:

1.12.x = perfect boot( same with the rest of the firmware)

10.12.x = perfect boot( same with the rest of the firmware)

1.9.x = black screen (makes it through initial check but those versions must use a different lcd)

Initial 4.4 ROM never released = white screen (half way through initial rca splash screen it goes white)

Any repacked or custom recovery = white screen (half way through initial rca splash screen it goes white)
[Android General] jerryvail35:
What would happen if we reflashed the firmware and left the lk.bin file out?
[Android General] smartmanvartan:
Whatever version you had before would remain.. And it is your bootloader.. Locked or not, you need it!
[Android General] jerryvail35:
Any way to edit it to get unlock to work?
[Android General] vampirefo:
I can't think of any, seems like rca has intentionally disabled the ability to unlock bootloader, I have no suggestions, you guys have tried everything possible, no ideal what to do next, unless by chance one of the roms you guys are able to flash has an unlocked bootloader.
[Android General] smartmanvartan:
There are a lot of versions to try... I'm still hopeful.
[Android General] vampirefo:
You are the man, I wish you the best of luck.
[Android General] jerryvail35:
Maybe there's a jellybean version that can be unlocked. I think this device has been around since late 2013. I think i seen in lk.bin that this device is running some form of mt65xx software.
[Android General] smartmanvartan:
This device was released with lollipop. My guess is during conception it was planned to be released with KitKat and because of that I was able to find a KitKat version of the firmware(probably for an earlier revision like 1.9.x). I found it on the same Chinese server that was posted on this thread on page 12 I think. But nowhere have I found any proof of it ever actually having been released with anything other than lollipop.
[Android General] dewds:
problems?

7 steps

i did all of the above and everything worked correctly and got the checkmark.now my tablet doesnt boot at all.is their a way to make it boot again?It does not show a screen at all with the power button or any button or plugging in or usb or anything?thank you in advance for fixing my problem lol
[Android General] jerryvail35:
hit the reset button then power on the device
[Android General] dewds:
It does nothing as though it doesnt know to turn on even charging shows nothing with main charger or micro usb.I think i see why they call it brick now lol.I dont wanna tie up the thread so if anyone has had this happen please let me know thanks.
[Android General] jerryvail35:
Try the other firmware version.
[Android General] ewilley2008:
I see there is a couple new files on a the Chinese site dated today...

RCT6303W87DK-ANDROID5.0-V70-V1.12.30-B-EMMC-user-Kingston-V6.1_20160121.zip

RCT6303W87DK-ota-V70-V1.12.30-B-to-V70-V1.12.31-B-test.zip
[Android General] smartmanvartan:
Sorry I've been out all day and couldn't offer any assistance.

1. Ensure that when the tablet is powered off(hit the reset to be sure), that you still get the preloader or a mtk device with a com port.

2. When did you buy your tablet? I've noticed two major branches of development that are not compatible. You may be on the earlier version using 1.9.x or 10.9.x firmware.

If you still have life in your tablet and it still registers as a device in device manager, It can be saved(maybe)

---------- Post added at 06:18 PM ---------- Previous post was at 06:15 PM ----------

Where did you find these? can you send me a link? they don't show up in my searches?
[Android General] ewilley2008:
Here's the link to where I have found the most files… not sure who/where/how this person gets them….

http://pan.baidu.com/share/home?uk=2958126999#category/type=0

---------- Post added at 07:16 PM ---------- Previous post was at 07:03 PM ----------

I have flashed the v70 boot and recovery images and it booted but still no ADB….

I then unpacked them and did some edits in both .imgs on the build.prop and the init.rc files and repacked, flashed and booted but still no ADB or any computer detection of it… I'm almost thinking its blocked in the kernel, but I'm just a novice with all this
[Android General] dewds:
nope doesnt register anymore tried 2 computers.I must have wiped everything to the point of no return.it had lollipop 5.0 and the model is 6303w87 and has dk on the end on the box.had 1.9.5 firmware.i disassembled and unhooked battery no help tried hooking up in all manners and button holding and pushing all manners.I will just buy one from ebay with a broken screen since everything else is fine.thanks for trying to help.the person before me kingrooted it and had messed the recovery file up.no worries thanks
[Android General] smartmanvartan:
That's too bad but yeah I bricked my first one with firmware from a 1.9.x. Mine being a 2.12.x.. How long ago did you buy it?
[Android General] smartmanvartan:
i cant seem to be able to download off their serer for the past two days...i.m interested in

rct6303w87dk-ANDROID5.0-V55-V1.12.0-EMMC-user-Memorylink-V6.1_20150715.zip

on page 1 of this link

and also this one RCT6303W87DK-ANDROID5.0-V11-10.9.0-root-20150213.rar

one page 5

if anybody feels like lending me a hand...
[Android General] dewds:
i got it in a trade.rca said they would look at it for a 30 dollar service charge but but they are plenty with broken screens for 30 bucks on ebay.needless to say if i get another just some basic root is all i will be doing to it.i would never have went so far if the recovery image hadnt been damaged.
[Android General] jerryvail35:
i tried, but the site wont let me download anything without an acount and since i dont have a phone a cant do anything.
[Android General] smartmanvartan:
Thanks it's cool ewilley2008 hooked me up.
[Android General] jerryvail35:
Glad to hear it. Hopefully something good becomes of it.
[Android General] jerryvail35:
.

RCT6303W87DK-ANDROID5.0-V70-V1.12.30-B-EMMC-user-Kingston-V6.1_20160121.zip has anyone tried this as stock firmware andhas anyone tried any of the test zips for this device to see if bootloader can be unlocked.
[Android General] smartmanvartan:
I tried it. It works well but I didn't try it for very long..
[Android General] NepoRood:
Hello All,

Been reading over this thread for a few days now, glad to see there's still some interest in these tablets. I'm new to

android, but I've been all over this forum and a ton of others. I've succeed in flashing custom ROMs on other

devices (following directions, of course), and want to further my experience.

I have all 3 of the RCA Android 5.0 models:

Voyager II (Actually, it's my sons), Viking Pro (the Wife's) and the Maven Pro (The one I've been messing with)

Funny the BL won't unlock with volume keys on any of them, however, "Volume Down/No" works on the Voyager...

The Viking matches some of the previous versions: RCT6303W87DK-ANDROID5.0-V63-V1.12.20-B, and I DL'd the zip

file from an earlier post that is compatible, extracted and unpacked the system.img to poke around.

I want to unpack the kernel and recovery, but the kitchen I'm using isn't compatible with these devices, so that's a work in progress.

At any rate, if there's anything I can do to help, just let me know, I'll be around...

Thanks!
[Android General] jerryvail35:
Finding a way to unlock or get around the bootloader is what everyone is trying to figure out. If we can get that, then all things are possible with this device.
[Android General] NepoRood:
Been working on it for a few days now, going to try a different approach after work today.
[Android General] jerryvail35:
As far as we know , its locked down in the kernel (LK)or little kernel..
[Android General] NepoRood:
I figured as much myself, been doing a lot of research today on the LK and bootloaders in general. I think it's probably going to take some kind of exploit to get it unlocked.

I'm curious about something, what tools are you guys using to unpack/edit/repack the images and what changes are you making?

I use Rickys Rom Kitchen (sent him an email about adding support) and Carlivs Image Kitchen (already supported), both on Windows 10

Editing with Notepad++

And I'm still waiting for my usb cable from Amazon, so I haven't had the chance to flash anything yet.

Regards,

Nepo
[Android General] ewilley2008:
I have been using Carlivs Image Kitchen in Win10 with Notepad++ as well and trying various edits in the .prop and .rc files in both the boot and recovery imgs. But I am a complete novice at this and just learning by reading any information I can find and then trying them.
[Android General] smartmanvartan:
I've been using the carliv tool as well and notepad++ is a good programm to have as well. To be able to get a custom recovery/boot image to work on our tablet, we need to:

a- unlock the bootloader with a exploit

b- find a bootloader for a tablet with the mtk8127 and the EXACT SAME SPECIFICATIONS

c- mimic the signature requested by the bootloader

d- compile a whole new bootloader

my personal skill level is likely to use the first two methods the thirt one is unlikely and the fourth one is impossible or close to.
[Android General] ewilley2008:
Yea I have downloaded most all of the RCT6303W87DK files from the china site and comparing the files and packing different combinations of the different files… and have downloaded any other roms that have the mt8127 and looking at the differences.

And I have really messed it up a couple times but have been able to reflash a unedited boot and recovery and got it working again.

Im leaning towards its in the kernel and have even tried different combinations of the kernel and lk.bin files from the different zip file versions.
[Android General] smartmanvartan:
Well it is the lk.bin file. That is the bootloader. It starts there
[Android General] Sir Jaxxy:
Sorry for the noob question. I have 3 Viking Pros (well 1 is the wife's). While trying to root my first one I messed it up and put it into an infinite boot loop. So I got another, why the hell not at only $80. I then saw how to flash the one in the boot loop and now how it up and running as well. However, the one I flashed is running a different build. This is the build that the 2 non flashed tablets use:

Kernel:

3.10.54

Sat Aug 1 23:17:27 CST 2015

Build:

RCT6303W87DK-ANDROID5.0-V63-V1.12.20-B

This is the flashed Viking:

Kernel:

3.10.54

Fri Nov 6 16:42:02 CST 2015

Build:

RCT6303W87DK-ANDROID5.0-V63-V10.12.0

1) Does the kernel date also represent the build date? So is the flashed device using the newer build?

2) Why do both tablets tell me I have the latest update when I go to Firmware Update and check for updates? Obviously one of them have an older version.

3) Has anyone else compares the performance of these 2 builds?

I have run a number of benchmark programs on both tablet and the flashed build blows away the one with the "stock" build. In fact on the stock build in the 3D test of AnTuTu v6.0.1 23221 both Garden & Marooned are unsupported. Garden, however, is supported in the flashed build and even gives a score of 2140 which isn't bad for a $80 10" tablet. I have not had time to use the flashed tablet yet to see a real world comparison. I am planing to play with it this weekend.

So I guess the question is, which is the better build and should I flash our other 2 Vikings with this other build?

If anyone wants to know the benchmark scores for the 2 builds let me know and I'll list them out.
[Android General] smartmanvartan:
it's not a bad question to have. basically they have different software packs depending on where its sold and when it's sold and each firmware version(10.12.x-1.12.x-2.12.x-1.9.x-10.9.x -b- v63-v66-v70-etc...) is a different branch of devellopment.

the newest one was found by ewiley2008 and its new from this month and its v70. From what i've seen, the important part of the firmware is the .12 or .9. Those are not compatible with each other. so 10.12.20 or 1.12.30 or 1.12.20 or 2.12.20 can intermix but put any firmware with a .9 instead of the .12 and you got yourself a paperweight. an other thing a user on this thread said that is good practice, I'm sorry I forgot who it was, is when flashing firmware that you are not sure about, omit the preloader when flashing and you can always go back. and one more thing, there are partitions in the tablet that are not included in the firmware so never format and flash with sp flash tools or you will have some bugs. mine had a gost wifi network call "nvram err (0x1)" or something like that and the hdmi stopped working. so don't format. The v70 is the smoothest one i've used so far fyi
[Android General] NepoRood:
RCA offered to replace my tablet because the volume buttons don't work to unlock the BL, I was like: on ALL of your tablets!

I'll pass, and find a workaround, somehow (I do have the 2yr Extended Warranty ;) )

[MENTION=4666511]smartmanvartan[/MENTION], where is the link to the v70 version?

I'll be glad when I get my USB cable, so I can do some actual testing, I'm ready to Flash! (Or Streak,or make enough "bricks" for a BBQ pit, whatever, lol)

Anyway, I'm on my lunch break and thought I would chime in.
[Android General] jerryvail35:
can some one upload the v70 firmware here so that i can download and try it? i cant download from the site itself.

---------- Post added at 08:59 PM ---------- Previous post was at 08:15 PM ----------

http://pan.baidu.com/share/home?uk=2...ategory/type=0
[Android General] NepoRood:
So, I cracked open the tablet to get a look at its guts and look at any ID numbers I could find:

Chip: MT8127A (1435-BACSH, CC4KGQSL)

Board: EM_T8515_V6.3

Drive: FORESEE 32G

Also, it has 2 Kingston ram chips on the board.

I've done some searching on the above, but can't get any decent results :(

I've attached some pics...
[Android General] smartmanvartan:
That's cool... One of the other firmware versions has the t8515b written in it.. And I found other tablets with the t8515 board... The key is to find a other tablet with the t8515 with a mtk8127 chipset... The one I found so far has a mtk8163...
[Android General] jerryvail35:
RCT6303W87DK-ANDROID5.0-V70-V1.12.30-B-EMMC-user-Kingston-V6.1_20160121.zip this is the one i need
[Android General] smartmanvartan:
Yup... That's the one.
[Android General] jerryvail35:
is there a way to download off of the site without signing up. because i dont have a phone to set up an acount
[Android General] smartmanvartan:
I'll upload it.. Give me a couple of hours and I'll post a link.
[Android General] jerryvail35:
your awesome bro
[Android General] smartmanvartan:
I am not responsible for anything that happens in your life including what happens to your tablet as a result of these steps.

Steps(Windows 7):

1- Install the drivers( they are unsigned don't worry it's ok.)

2- Plug your tablet in as such: turn off the tablet. Plug a male to male usb wire from the computer to the usb port on the tablet. now plug the power wire into the tablet(at this point your computer should detect the preloader and install the driver). Once that is done, unplug the power cable from the tablet.

3- Extract the firmware and the sp flash tools to your desktop.

4- Start the sp flash tools and where it says scatter file loading click and navigate to the folder where you have the firmware and load the scatter file. You will see the firmware get loaded and a checksum check.

5- Once that is done, Click on the download button.

6- Plug the power cable into your tablet. At this point the sp flash tool will load the firmware into the tablet. DO NOT UNPLUG ANYTHING UNTIL THE SP FLASH TOOLS SHOWS YOU A GREEN CHECK MARK TO INDICATE THAT IT IS DONE OR YOUR TABLET WILL BE HARD BRICKED AND UNREPAIRABLE.

7- Press the reset button and turn it on. Done!

Sp Flash Tools(Download version SP_Flash_Tool_V5.1532.zip)

Sp Driver Installer

RCT6303W87DK-ANDROID5.0-V63-V2.12.20-B-EMMC-user-Kingston-V6.1_20150811(Horisontal Splash)

RCT6303W87DK-ANDROID5.0-V63-V10.12.0_T8515B_V6.3_PCDDR31G_20151106.zip(Vertical Splash)

RCT6303W87DK-ANDROID5.0-V70-V1.12.30-B-EMMC-user-Kingston-V6.1_20160121.zip(Horizontal Splash)

Sources:

http://laurentiumihet.ro/technology/download-sp-flash-tool-v3-v5-latest-versions/

http://www.needrom.com/download/mtk-driver-auto-installer-v5-1453-03/

http://pan.baidu.com/share/home?uk=2...ategory/type=0

http://baiduyun.57fx.cn/so-result.html?keyword=RCT6303W87DK&type=share

And Google of coarse...
[Android General] smartmanvartan:
https://play.google.com/store/apps/details?id=com.fongo.dellvoice&hl=en

if you're in Canada. otherwise, i think google voice works the same in the states...

I found this one for two way texting...

https://play.google.com/store/apps/details?id=com.pinger.textfree
[Android General] jerryvail35:
Yeah. I tried a few of them today. They all suck. Just going to have to wait téll I get a real phone.

Oh. And this v70 firmware seems to work a lot better than the other on.
[Android General] NepoRood:
I finally got my USB cable and flashed the V70 Firmware, noticed the "Wally and Sammy" store stuff was gone, but you could uninstall those anyway. Has anyone tried flashing just a boot.img?

Regards,

Nepo
[Android General] jerryvail35:
Negative on boot.img for me. Still trying to force fastboot bootloader unlock.
[Android General] Spartan Legionnaire:
Anyone has noticed improvements in performance when deleting with root the stock apps, like Walmart, some Google apps??
[Android General] jerryvail35:
I have , but of course, the less apps you have the faster your device will be.
[Android General] Spartan Legionnaire:
I don't know if I'm wrong, but the 1GB of ram isn't enough for Android 5.0, I think.
[Android General] jerryvail35:
1gb of ram is plenty for this device. mine stays about 400mb free with the use of clean master and making sure all my recent activitys are all closed.
[Android General] Spartan Legionnaire:
But that's no normal use, I mean, it should not be necessary to close background apps and use a memory management tool like clean master to have free ram, just an opinion..
[Android General] jerryvail35:
Well if we can get this device unlocked maybe we can get a rom with built in swap partition.
[Android General] ewilley2008:
I see there is a new v72 file...

RCT6303W87DK-ANDROID5.0-V72-V1.12.30-B-EMMC-user-Kingston-V6.1_20160203.rar

http://pan.baidu.com/s/1i4exPBn
[Android General] smartmanvartan:
I'm downloading it and I'll give it a shot.
[Android General] jerryvail35:
I wonder if rca is working on a major update for this tablet, because of all the firmware versions.
[Android General] Spartan Legionnaire:
Let's hope it is Android 6.0
[Android General] jerryvail35:
Anything new with this version.?
[Android General] smartmanvartan:
same as the v70.. haven't tried unlocking the bootloader....but it runs smooth.
[Android General] Spartan Legionnaire:
It is safe to flash it?, root probably will work?
[Android General] jerryvail35:
yes.safe to flash and root..
[Android General] Jacube22:
how to get out of bootloop

somehow got this thing into bootloop, and i dunno how to fix it.

-can't get this device to decect via adb or fastboot,

-trying to boot into recovery doesn't work
[Android General] smartmanvartan:
Adb doesn't work on this device. Fastboot you can get to with recovery or from within android terminal. Just follow the steps in post #279. Do not flash the preloader. Uncheck the preloader from the firmware list when flashing because in your particular case there's no way to know what firmware you had unless you remember your version number. .. good luck :)