yashsingh1/xdaforums huggingface dataset:
[General Questions and Answers] PSCGOhio:
I'll give those a try, thanks! I have PDANet installed already, unit was set to debug mode too so that's fine. Drivers are different from what I have going on so I'll check that.

As far as the Fastboot, I'll see if that works at all. Whoever at ALCO/RCA ordered this build had it all locked out so it won't go to Fastboot. I've been searching for that forever, even have a thread here on that mess. Fastboot I could possibly fix it, but all we get is ADB sideload. The rest is totally locked out and it only stays visible for about a 2 count until you manually go into adb sideload on the Recovery menu. Anything else errors out or locks up and that's been a constant theme for all of us with this problem.
[General Questions and Answers] user201:
Mine has different hardware ID's from those. They are:

USB\VID_0BB4&PID_0C02&REV_0216&MI_00

USB\VID_0BB4&PID_0C02&MI_00

I wonder if there are different versions of this tablet out there and that's why Kingo works for some people but not others. What's the FCC ID on yours?
[General Questions and Answers] 11fan:
"i was on 1.3.2 with root updated to 1.8.0 lost root and just reran kingo and root was back. didnt lose anything either."

thanks, exactly what i was wondering about the update and if kingo would work after update

Mike

---------- Post added at 08:09 AM ---------- Previous post was at 07:50 AM ----------

i have one of last years rca models opened up : / it actually opened up on its own! bought my daughter one and within a few months the battery swelled up so big it literally split/broke the tabs on the case of the tablet. i thought the battery was going to eventually explode but never did. i clipped the 2 wires attaching the battery to the tablet so in case it did explode it would not damage any other parts, but i never did find a replacement battery other than some in china i think, eventually quit looking, cheaper to buy another tablet. dont guess the rca opened up will help out any will it? u looking for a cube opened up right?

Mike
[General Questions and Answers] TripFX:
yes that would be correct but it has to be specificly the U25GT-C4U model. However I don't think that will be necessary anymore as i mentioned a few posts back that i sure i know how to unlock our bootloaders know it's just a matter of having the time to make it and the confidence to do it soon. still researching and messing around with it.

On an even more brighter note I found what i needed to get us a stock backup that should work. Just waiting on tab to charge then gotta dump it then upload it. But it should hopefully work with the bootloader locked.:fingers-crossed: But i should have something up for you guys to test. worse case is it wont install or the best case it installs.
[General Questions and Answers] TripFX:
Here is the stock dump of our tabs with md5 so it should work with locked bootloader. Don't ask me how to use this to fix bootloops or anything. I am just providing the stock files. You are doing so at your own risk and i assume no responsibility.

RCT6773w22 v38-v1.8.0 Stock Dump
[General Questions and Answers] edbassman23:
Thanks

Wysłane z mojego HTC One przy użyciu Tapatalka
[General Questions and Answers] TripFX:
stock scatter file added. working on bootloader unlock still but closer xD.

[MENTION=6277009]Lukas2179[/MENTION] google it or wait patiently for me to finish unlocking bootloader and make a custom recovery and then write up instructions don't ask for an eta or anything as i will ignore it as the question is obvious like others who contribute to this site. it's ready when it's ready.;)

UPDATE: I took the time today to do a factory reset and made a user backup. can be found in previous post link. I do not guarantee that this will help but if it does or doesn't please let others know prior issue. Steps to get this to work if it does and if you can make it there.

1. Download "userdata_20140701_040301.backup" (105MB file) from stock dump link and place it on external sdcard.

2. Reboot into recovery. this can be done 2 ways. 1st from powered off hold the vol button closest to the usb port while holding power it on and wait til you get to the recovery screen. 2nd way if for some reason holding the keys doesn't work and you have adb enabled use the following cmd without ""'s "adb reboot recovery"

3. use the vol keys to navigate and the power button to select do a factory reset then.

4. restore user data and reboot. plz wait 15-30mins max before saying it didn't work. first boot always takes the longest.
[General Questions and Answers] Lukas2179:
I got md5 checksum error.
[General Questions and Answers] TripFX:
is that all it says or does it give more specifics? Also sorry it didn't help.

UPDATE: the cube u25gt-c4w and Chuwi VX8 which, both uses same soc as ours, they are emmc based partitions where as ours is mtd. So we are back to being screwed. can't use mtk droid tools as it errors and even says unknown rom structure. due to improper scatter file. can't use one from another tab as i just said they are emmc not mtd so we can't get the proper backup for others to use to fix there tabs. Unless someone who is advanced and experienced it's would be safe to assume that you just get another tab.
[General Questions and Answers] Lukas2179:
It specifically said Error: Checksum Compare Failed
[General Questions and Answers] TripFX:
that sucks. Well in order to do anything as far as flashing even with a locked bootloader we need at least a proper Scatter file for our specific device. I have attempted with nothing but failure to get this file. the other problem im facing is i can't find out what they modified in the preloader for both me173x and honor 3c so i can make the changes in ours. I have found the unlock files for both devices but they are worthless to us aside from lettings us know we need both scatter file and modified stock preloader of our device.

So to clear things up

1. If you want to do a clean wipe/fix bad update or corrupt with locked bootloader we need to get/make a scatter file. the files to flash stock i can get and already have most .img files including but not limited to system.img.

2.If you want cwm/twrp/philz recovery and more roms we need the exact thing/s to change in stock preloader to unlock the bootloader which will also allow fastboot flashing.

I have done all the research i can do as i only know english and "bad" english and the infamous "sorry for my poor" english. If someone is can read/write/communicate rus or cn you can ask some of the devs on those sites such as 4pda.ru if you can get me the info I'm more then willing to do the work to get it all working.

Otherwise this will be my last post in this thread unless we can get these things done. I will check this op for a little while in case someone is able to get the info but you are more than welcome to pm the solutions/info. I'm sorry but I've done everything I can do at this point and time.
[General Questions and Answers] 11fan:
Two questions. What is keeping this device from communication through fastboot? The partition layout? And is it possible to install a second bootloader on the rca device like we do on the kindle devices instead of unlocking the current bootloader? I'm just brainstorming! And also I'm going to order a battery for one my daughter used until the battery swelled up and had to quit using it but its last years model though, I think there the same really. So I will have one to test with after I get the battery and if anyone wants to know they are $14.00 and free shipping from amazon also seen them for about ten dollars on other sites I had never used before

Mike

Sent from Amazon jem running KK4.4.4 Liquid Smooth MS3.2 using xda free
[General Questions and Answers] TripFX:
1. the bootlloader like i just mentioned in last post. With a proper scatter file of our device we could use a modified for ubifs sp flash tool to flash even with the bootloader locked. Least from what i've seen of mediatek socs in general they sp flash tool first to get cwm/twrp to install same with unlocking the bootloader as well as restoring back to stock. Now that i thought about it. I don't recall any mediatek soc's on forums using fastboot for anything. But i am 100% sure the lock and unlock mechanism is in the preloader.img. I can pull our stock preloader.img but need scatter file of our device to flash it back. I've already looked at other devices that have our mt8127 they all use emmc not mtd.

2. honestly don't have the slightest clue nor would i even attempt it as the soc is completely different then ours. I know the older models of our devices that came with jb uses mediatek MT65xx dual core where the newer that came with kk stock uses mt81xx quad core. The MT65xx has plenty of tools that can create a scatter file for you as well as backup and flash. The same tool can be used on the mt81xx to flash or backup but not create the scatter file as that part gives error. If i can get the scatter file only i wouldn't mind reverse enginnering the preloader.img to find out how to unlock the bootloader. but being i have no scatter file to restore backup it would be a 1 shot only chance and if it wasn't done right it would brick the device. Being i classify my self as a noob in the realm of linux/android that's a pretty terrible idea to try.
[General Questions and Answers] nathanski:
kingoroot in my case used fastboot inits rooting process

:confused:and as you I can't speak Russian, ect ext, just wanted to say thanks for your hard work. and I grabbed the tool but came out with no results in finding the files rather mad this has so little support, stock rooted is usable thinks again
[General Questions and Answers] codelover:
[MENTION=2670928]TripFX[/MENTION], sorry bro for my late reply, was busy with something else. Well, i think you have wrong understanding about locked bootloader.

#1) Unlocking on ME173X & H3C are possible simply because there exists

two variants

of these device:

One with locked BL and another with unlocked BL, so we simply use files from the unlocked variant on our locked variant.

#2) If Magic TWRP worked & you booted to TWRP before, you device is

NOT

locked/restricted.

Device with locked BL cannot use SFPT to flash at all, and if you attempt to flash through running system, you will get a bootloop instead.

The reason why TWRP didn't work properly is because this device uses UBIFS, not many custom recovery built with this fs support.

Infact, yuweng already pointed you to the right direction, i didn't see anyone else sharing a working TWRP with UBIFS support here.

For now, you can try to port using above TWRP (old), or you can try carliv's modified CWM as he has a build with UBIFS support too.

Without UBIFS support in recovery, you won't be able to alter anything stored in /system, as well as /data.

Changing fs to ext4 is possible, but that would require lots of manual works, as well as some brave man willing to try it as there is a risk.

Fixing a scatter is easy, you can use below attached scatter file as a

reference

, but you MUST check & fix the offsets according to your device first.

Perhaps i can help with this as well as creating a working recovery, but first i will need some info from your

rooted

device, please post the results to pastebin:

Note: Some path might not exist in your device so you can ignore them, just post those with output.

adb shell
su
cat /proc/mounts
cat /proc/partinfo
cat /proc/partitions
cat /proc/dumchar_info
cat /proc/devices
cat /proc/mtd
ls -al /
ls -al /dev
ls -al /dev/block/
ls -al /dev/block/platform/
ls -al /dev/block/platform/mtk-msdc.0/by-name/

EDIT #1:

Alright, thanks for the well organized infos, but looks the the device did not provide all the info i need, especially the start address.

I guess i will have to write some script to parse & calculate the address manually, argh! that's gonna take quite some time..!

Btw, do you know how to dump the ROM using SPFT 'Read Back'? Please create the dump & send me the via PM. (You can refer my 3C guide)

Open SPFT 5 & load below scatter -> Read Back -> Add -> Double click "PageSpare" -> "ROM_0" -> Save -> "Read Page Only" ->

-> Start Address: 0x0 -> Length: 0xf800000 -> OK -> Read Back -> Connect the phone @ PreLoader mode.

I have prepared a test recovery for you guys, but until a fixed scatter is ready you can only flash with MobileUncle or Flashify app.

This is just a test to check whether the recovery is booting, i will try to fix other problem later.
[General Questions and Answers] TripFX:
[MENTION=4893922]codelover[/MENTION] omg thank you so much. This was completely unexpected. I will trust your opionion that I have have a misunderstanding with the bootloader. Sorry im an expert in windows not andriod/linux. I really do appreciate you helping and even responding. i figured you was just too busy. I have to get ready for work but i will most def have the logs pulled. Yeah you are right about being pointed in the right direction for easy twrp as i did get twrp working partially. Even followed the ubifs tut posted but i ended up giving up as i thought it was the bootloader. I can reboot fastboot but it hangs saying "fastboot mode...." But yeah i will get those for you as soon as i get home.

Update attached links to paste bin:

cat /proc/mounts

cat /proc/partinfo

(no directory found)

cat /proc/partitions

cat /proc/dumchar_info

cat /proc/devices

cat /proc/mtd

ls -al /

ls -al /dev

ls -al /dev/block/

ls -al /dev/block/platform/

ls -al /dev/block/platform/mtk-msdc.0/by-name/

(no directory found but by last one i knew it would be .1 not .0 . also note /by-name fails same with /by-number)

So I gave you this one as well just in case;)

ls -al /dev/block/platform/mtk-msdc.1

Update for everyone waiting on progress:

Thanks to [MENTION=4893922]codelover[/MENTION] we are making further progress :highfive:. Please be sure to thank him as he is gracious enough to help us even though he doesn't have our tab. Also as always thanks for being patient.
[General Questions and Answers] jpcdeux:
Odd issue.

I rooted, it somehow unrooted itself. Did one of it's random reboots and upon restart NO ROOT and cant get Kingo to reroot it. Says it roots, when it restarts gone. Anyways, I'm sending this $hitbox back and need to totally reset it. A factory reset doesn't get SuperUser off of it. Anyone have any ideas or reset tools or anything.....
[General Questions and Answers] champ1919:
Supersu has a unroot/switch su app optioning it's settings.
[General Questions and Answers] TripFX:
I had the same issue when it updated from v132 to v180. Did a davlik cache wipe (used Performance Control) and reran kingo and worked fine since.
[General Questions and Answers] thhhe rootmastr:
rca 7 voyager root

hey man if you were like me bought that 30 dollar rca :cool: 7 voyager and if you want to root go to google search king root and you have to enable unkown access and my rca had secess with mine once it is done you might want to download root checker just to see if you have root access :good:
[General Questions and Answers] nathanski:
well any news on development and ect ect

:D I pray some one is making strides into this ,,, root is good but custom recovery and over clock would be wonderful / no? lol
[General Questions and Answers] PSCGOhio:
http://xdaforums.com/general/help/rca-rct6773w22-8gb-7-inch-touchscreen-t2979283/post58617093

Over in that thread we've now got a couple of live units, one untouched at the moment, working on this. Waiting for some of the brains in the thread (and possibly in this thread) to pop in and go step-by-step on what needs to be pulled to hopefully get at least the recovery part working so we can safely then experiment with not only the clock speeds, but also the GPS, FM Radio and Bluetooth in there but turned off by the Mfg. It's all in the APU for the thing, the MT8127, just doesn't work since no drivers and software for any of it were included in the build.

I think we're going to get a break shortly! I also managed to find someone at Venturer to potentially get the ROM/Recovery files up where people can get to them and/or beta test something to at least de-brick these things. Not holding my breath on that part, but it's a start!
[General Questions and Answers] nathandski:
well i did it i broke my Kitkat

:crying:

:crying:

didnt think i would but yea one more down any # to call and warrentE it maybe i will dig that info up soon ,,,, just need a stock rom to sideload in the blasted stock recovery ,,,, didnt kill my recovery so thats soft brick Right>>> wish this OEM would have given us that stock recovery rom.... by the way my user backup is not a option i made one, and it installs well, but its not a full bakup the just the user files
[General Questions and Answers] nathandski:
now that reset hole is ised in spftool who would have thunkit

but i installed my rca with Cube U27GT-S from needrom site that said it boots up to no dog boot screen and whin fully loaded turns screen off,,, it has a full splater file and all the fields have files system.img is the one i used system.tar for but i was wondering how i invert my tar file TripFX posted into a img file it wants to use in spftool wish it was as easy as having a full rom ??? TripFX are you around ? maybe you know lol:D
[General Questions and Answers] PSCGOhio:
If I understood any of that, the GT27-5 won't help you. This is the U25GT-Special and that unit has the mini-HDMI port on it with a different outer case, otherwise it's a duplicate. So that'd more than likely be why the boot halted. Big question is what'd you use to even get the GT27 ROM IN there? Recovery hasn't even accepted anything we've tried.
[General Questions and Answers] TripFX:
As far as a custom recovery goes, [MENTION=4893922]codelover[/MENTION] and I have been working hard at it. We have have been testing cwm and twrp. But in the end we both figured it would be best to compile from scratch instead of using a port tool. Being me and him are both new to this part it will take some time. I do have a full stock dump that i will uploaded later except scatter file. SP FLASH TOOL atm is beyond way to slow and your more than likely to have the battery drain before it even gets halfway done. The good news is if you can still access stock recovery with adb or can adb in general you should be able to flash the custom recovery then use the backup i will make to restore the rom. Has far as OCing or turning on BT,GPS, etc. we would need source code for our rom to do these things. So if your expecting a custom rom or anything like that for this device DON'T. While yes it is still possible to make a custom rom for this device without source code as i have seen someone else do a few years ago for another device. The work and knowledge to do it is just beyond what I and most are capable of.

[MENTION=6389569]nathandski[/MENTION] hate to break it to you but the ug25-gt's use's emmc/ext4 while ours is mtd/ubifs. More than likely you hard bricked it. Furthermore not a single device out there atm that use's our soc has mtd/ubifs.
[General Questions and Answers] nathandski:
reclesslee is the method. ps dont follow this path yey incase a update.zip comes out

SP_FLASH_TOOL+TINNO_DRIVER.rar google for the tinno-drvr? just cause then SP_Flash_Tool_v5.1436.00.zip for the update dint know why the other may work just older tool/

file off of needrom site

and a toothpick or something to hit reset button to in back pin-hole. note it was soft bricked, that was why i did such reckless hard.brick ing task how no turning back cause it has no half bricked recover in case the update.zip rom came to light i have to have a splaterfile rom now ......:confused:
[General Questions and Answers] nathandski:
know you would do it, i cant say i did a good thing i know just tinkering

:cyclops:

well leats the other soft bricked voyagers have hope if i have less than showed smarts in hard bricking er, i did use your files but they arnt .img there .tar, so still a hard brick,,, still thank you for your work should help others ,,, i fell dumb but spflashtool was fast and it would be the only fix for half bricked till you could get or make a stock recovery flashable update.zip no adb in half brick>
[General Questions and Answers] TripFX:
The stock dump [MENTION=4893922]codelover[/MENTION] made from my tab is up and the old one i posted is now gone. It's still the same link i posted a few pages back. This is for people who KNOW what they are doing. So don't ask me or codelover unless he decides to on his own free will.

[MENTION=6389569]nathandski[/MENTION] please don't double post. Use the edit feature instead. Thanks.
[General Questions and Answers] nathandski:
i dont Know exactly what i am doing so should i try to keep at it or wait ?

i wasn't trying to make anyone mad, just offer a bit of working stock to Research n development T&E... .. . that said i would need to open my tablet up and charge it all with hot wires i guess, not sure but i think the preloader and everything has to be flashed for it to enter charging mode through the mini usb port.. ps im asking for the sake of furthering this for others sake i had ordered a new tablet befor i ever ran SPFlash tool. Should i keep trying or wait?
[General Questions and Answers] TripFX:
To honest its your tablet and you know the risks. The only one responsible if anything goes wrong is yourself, just as I do. So its up to you on what you wanna do. If you do decide to do anything plz do report back your findings. Other wise waiting is just fine.
[General Questions and Answers] Total Nerd:
In another thread (I can't link), a user posted two update zips with the RCA signature. Found this file in it (scatter.txt) and thought maybe it would be useful?

PRELOADER 0
PRO_INFO 0x2000000
NVRAM 0x2800000
PROTECT_F 0x5800000
SECCFG 0x7000000
UBOOT 0x7800000
BOOTIMG 0x8000000
RECOVERY 0x9000000
SEC_RO 0xa000000
MISC 0xa800000
LOGO 0xc000000
EXPDB 0xc800000
TEE1 0xe000000
TEE2 0xf000000
KB 0x10000000
DKB 0x10800000
ANDROID 0x11000000
CACHE 0x51000000
USRDATA 0x81000000
[General Questions and Answers] TripFX:
PM link to me plz
[General Questions and Answers] vampirefo:
Interesting, you would need to use RCA boot.img, flag needs to be set as ext4 as far as system.img might not be important.

sent from my kingSing T1 via taptalk
[General Questions and Answers] Total Nerd:
Are those the starting addresses codelover wanted before? Or...
[General Questions and Answers] TripFX:
that would be correct

[MENTION=2472806]vampirefo[/MENTION] thanks for getting both zips.
[General Questions and Answers] nathanski:
Do we have the files up on another host?

or are they viable? looks like every one has been making great progress !

thinks for the updates everyone, i lost any work i was doing on this tablet seeing as my hard drive burnt-up on my laptop,

but it looks like new files have came to light, and they are more than likely closer than i would have ever got. I am wishing every one luck and thanks for the news.
[General Questions and Answers] TripFX:
Below are the the files needed to tested and is alpha and 50/50 that you may brick. USE AT YOUR OWN RISK and ONLY flash recovery, for now. Only report back using the following format

Flash: Successful/Unsuccessful

Speed: Fast/Slow

Alpha Test
[General Questions and Answers] vampirefo:
That should be enough to fix the broken tablets.

sent from my kingSing T1 via taptalk
[General Questions and Answers] nathanski:
TripFX i think your zip file is broken in some small way cant show a log or anything

It just doesn't want to extract clean and well spflash tool throw a error device booted to early, but I failed to find a full cause, wish I had better info on a corective path ,,, PS I found more firmware in the wild on a mt8xxx Chinese OEM site but the links were broke at the moment -as always wish everyone luck on this project heck its fun to be trying even if it is on a rca voyager they are pretty cool for there price point'' :p
[General Questions and Answers] TripFX:
just downloaded the zip via firefox and everything unzipped fine. As far as the error device booted to early, are you waiting to plug it in after you press download or before. I found it easiest to wait til after you click download before plugging in.