yashsingh1/xdaforums huggingface dataset:
[Android General] kokuo81:
Ok guys, here I am :)

First of all, this guide is intended for the Jiayu G2 1GB dual core.

After trying the "recovery" and "SP" methods, I definitely go for the SP one. I mean, the recovery is quicker, but with the SP you are sure to have a totally clean Android installation.

This said, let's start :P

1) First of all, you have to download this:

https://mega.co.nz/#!GNwiyYzJ!Z6sRAmT_D4tw2XqfbIgSonVan-sGmviCUMTT8QURdl4

It's basically the Flasher (updated to fix a UBOOT.bin issue with the JB 4.1.2 IPK) and the Jiayu driver folder.

2) Extract the archive on your desktop

3) Go to the extracted folder and enter the "USB VCOM Driver" folder

4) Select your Windows version and open the relative folder (if you have Windows 8, like me, the Windows 7 folder is the choice)

5) Once inside that folder, right click on the file according to the proper version of your Windows (x64 or normal).

6) Select "Install" from the menu

7) Select yes to the "not firmed driver" warnings and let Windows install the drivers

8) Now, with the driver installed, plug the USB cable to the computer and to the Jiayu and turn on the Jiayu (Note. this is not mandatory, but since Windows will install some more driver, just let it do it).

9) After this, unplug the usb cable from the Jiayu, open the back cover of the phone and remove the battery

10) Download this firmware (is the Official 4.1.2 from Juayu. I've tried a lot of firmwares and as for now the one running better (and without ****ty Chinese apps) is the official one):

https://mega.co.nz/#!HFRW1DAL!D-ffeBzV7fcd7psCafYT2jOG9nQbHi2BaUWvkjIvtJU

11) Extract the firmware on your desktop

12) Now go back to the SP Flashing tool folder (the first file you downloaded), right click on Flash_Tool.exe and "run as administrator" (dunno if it is needed on XP, I don't think so)

13) Once the program opens, click on the "Scatter-loading" button on the right

14) Locate the Firmware folder and select the scatter txt file

15) If you did everything good, the program should load the firmware without any error message

16) Once done, click on the "Download" button

17) Now you have to be quick. Connect the usb cable to the Jiayu and quickly insert the battery

18) If you did it quickly enough, the program should start flashing the firmware. If not, redo the process

19) Once the flash is done, a green circle will be shown. You can unplug the Jiayu, remove the battery for some seconds and then put it back together with the back cover

20) Turn on the Jiayu and you will have the new firmware :)

(Note. your phone will be in Chinese at this point. To have it back in your language, just enter into settings and then scroll down looking for a small "a" image on the left. Once located, enter that menu and press the first option to select your language)

That's all

I'm now testing some fix (the GPS fix and the 3G fix). Once done with the testing, I'll post the guides :)

Credits to Supracer for his advices :)

Hope it helps. Any question, I'm here

Cheers

kok
[Android General] Supracer:
I noticed you have windows 8 and installed the drivers..... All night I've been trying to install drivers but didn't work only on windows 7..... Every time I plug in my phone without the battery windows sees it but cannot install the drivers because its like doing a weird thing.... Its like the USB is plugging in and out every 5 seconds.... How did you do it?

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] shrimpodog:
Cheers kok. An excellent walk through.

If I can add a few comments based on my experience following it.

1)	I was unable to install the driver in W7 32 by right clicking / install. I got an error that this version of windows does not support this installation method, or similar.

2)	So I tried knowing that the driver was there from a previous try, and connected the phone with battery in and turned on. Still no joy. Turned out the phone was picking up some PDAnet drivers that were in the W7 installation from a previous tablet encounter

.

3)	So I ditched W7 and moved to a clean XP. This time the driver went in with the right click install.

4)	I still got some driver errors when I first connected it with the battery in and turned on, but I ignored them.

5)	Then when running Flash-Tool and loading the scatter. Previously from the other downloads I was getting the “legal” error when loading the scatter. I still got these, so tried your official 4.1.2 download. This one was the only one which loaded with no scatter error.

6)	Failed on the first attempt with the connect usb / insert battery procedure, but second time it started the dump to the phone OK. This was the step I was missing in my previous post yesterday.

7)	Restarted in 4.1.2. An excellent result. Thanks for your help.

Finally can you give me an idea of the GPS and 3G fixes? What issues are they designed to fix? Are these not working correctly in 4.1.2?

Cheers.
[Android General] kokuo81:
Hi Supracer,

I simply right clicked on the .ini file for the x86 version of windows 7 and selected to "ignore risk" when the warning message appeared. After it, connected the phone and everything worked fine.

Great you made it :)

Regarding the GPS and 3G fixes, there is a way to have a semi-istant fix for the GPS (4-8 seconds) and have a better 3G connection.

I'm still testing them so you have to wait a couple of days more :)

Cheers

kok
[Android General] wahyuwidi:
hi kokuo, i still try to download the firmware and always get temporary error ,, does this firmware is stable for daily use? thanks
[Android General] kokuo81:
If you refer to the firmware posted above, hosted on Mega, it is available to me without errors (just checked).

Anyway yes, it seems stable. I just got shocked by the boot time of the new firmware (4 seconds from when you push the on button to the unlock screen O_O... Unbeliavable!)

Cheers

kok
[Android General] wahyuwidi:
i have finish to download it use my jiayu g2, but i cant find the file where is available.. and now try to download it again via pc.
[Android General] shrimpodog:
You need to download both links from Kok's post to a PC and save /run / install them on the PC.

They then help you to transfer the updated firmware to the G2 via the USB link.

Don't download anything directly to the G2 from the intertnet.

Hope this helps.
[Android General] salmanc:
MT6577 Driver not installing issue

I too found this ridiculously hard! I tried on XP, W7 then fixed on W7

I resolved this issue, by

1. opening system devices, and expanding the list where it says Ports.

2. Connect the phone without battery and for a second it will see the driver on whichever USB port. at that exact moment right click and update driver. Then install the driver from the file you have manually. (YOU WILL HAVE 1 second maximum before the thing disappears).

(If this method does not work, then Add the Driver Manually, Go to System32, and Hdwwiz.exe (show all devices, then look for mediatek, then click "have disk")

Basically you JUST have to MAKE SURE you get the MESSAGE "THE DRIVER INSTALLED SUCCESSFULLY" in system tray. Does not matter if phone is connected or not. It just has to be installed so that it is NOT installing during SP Flash tools! otherwise will not work!

3. disconnect phone after driver installation.

4. Run Sp Flash tool (run as administrator)

(make sure its a higher version as stated on the tutorial I used Latest version SP_Flash_Tool_v3.1224.01 (search in google to download)

4. Add scatter file,

click DOWNLOAD, immediately attach phone, without battery (but leave the battery kind of hanging on so you can press it straight in). Once you get the red bar, coming up then immediately press battery down. it SHOULD then go onto the next colour of the bar which is yellow (the SP Flash tool needs the battery to continue powering the phone to write data to it).

DO NOT WORRY IF IT DOESNT WORK FIRST TIME ROUND OR EVEN 10 times, it will not mess up your phone provided you have not gone past RED bar. If it starts writing and you disconnect you could cause issues as it has begun writing data - solution would be to re-run SP flash tools again. Usually it disconnects after RED bar if you havent done it right.

You may get BROM errors, and DISCONNECTION errors, keep trying!!! YOU WILL GET THERE.

Believe me this needs PATIENCE. I tried EVERYTHING, then finally got the driver to install as above, and got the USB to recognise - then the scatter will . Also, sometimes if your USB is loose, when you have pressed battery down then make sure you keep the USB wire in with your hand against the phone. (not too tight, but tight enough so it doesn't lose connection - ONLY if you have a loose connection)

:highfive:

---------- Post added at 04:35 PM ---------- Previous post was at 04:10 PM ----------

Just a heads up to my UK friends...

The 3G does not seem to work on my handset on the Orange (UK) network, it gives you 2G, but no 3G access (just spoke to Orange and they think hardware does not support it.)

Band Specification of Phone

Band 2G: GSM 850/900/1800/1900MHz

3G: WCDMA 850/2100MHz

OS Android 4.1.2 JB

CPU MTK6577, 1.0GHz

ROM 4GB

RAM 1GB

Any ideas?? Anyone get the 3G working in the UK on any network?
[Android General] abirjin:
Sorry for the super late reply, I have a Jiayu G2 dual core 512mb phone, does it have an official JB ROM yet? if yes can you please guide me on how to root my phone and update JB ROM?
[Android General] salmanc:
3G not working!

Hi

Good tutorial.

What did you mean by 3G fix? I am currently not receiving 3G on my phone after 4.1.2 upgrade - but I cannot remember if it was working before.

The "network mode" is greyed out.

I am on Orange (UK). Any ideas?
[Android General] kokuo81:
Yes, there is an official JB 4.1.2 for the 512mb phone. I flashed it on my 1gb phone by mistake. I discovered that it was a wrong version only because my back camera was not recognized (the 512mb has a 5mpx camera, while the 1gb version has an 8mpx one).

I just came home but I have to get out again in some minutes.

In 3-4 hours I'll upload and post the official JB 4.1.2 Jiayu G2 512MB firmware version (the flashing steps are exactly the same).

Cheers

kok
[Android General] shrimpodog:
No ideas I'm afraid, but I upgraded mine to 4.1.2 this am. I have a Giffgaff (O2) SIM in the G slot, and a T-Mobile (EE / Orange?) SIM in the W slot. Hence I think ? I've chosen to run my T-mobile at 3G and Giffgaff at 2G.

Network Mode is available for both Sims in Mobile Network settings and I can set either SIM to Auto / GSM only / WCDMA only. The T-moblie SIM is presently in auto, but if I force it manually to ether WCDMA or GSM I get an available / connected indication at the top of the display on each setting.

Rgds
[Android General] salmanc:
For some stupid odd reason it seems to be working now. I removed the sim, put my sisters orange sim card in slot G replacing mine.

Switched on phone and it gave PUK code (remains:0)

Removed that, and put my sim card back in slot W and when I switched on phone it worked.

Some miracle I'm not sure what...

It gives a H symbol in the top now next to the R symbol

Do you get a 3 symbol at the top when its connected to 3G?

Can you post your APN setting for T-Mobile? Ill see if that may fix the issue. Seems odd the 3G isnt working. I bought my

I bought it from here:

http://www.ebay.co.uk/itm/130803124456

Is yours the same model? If it is theres no reason why 3G should not be working on mine, since the networks all seem to work on the same frequency for 3G

I think some networks possibly need dual frequency to work on 3G and maybe orange is one of them, but you say T mobile is working....

hmmm...
[Android General] kokuo81:
Here it is:

https://mega.co.nz/#!jEwWDDSJ!BUernB6Otk-_8LqyVQo0mUtvbrph_fgXsJS9BAkLzuY

To flash it, just follow the guide I posted using this one as firmware.

Cheers

kok
[Android General] wahyuwidi:
thanks bro, finally i installed jb on my jy-g2.. work great..
[Android General] kokuo81:
You are welcome dude :)

Cheers

kok
[Android General] shrimpodog:
Don't recall seeing a "3" but not used the phone that much, so could be wrong.

"H" is the boy though. I see that when on high (ish!) speed data.

You can always double check in Settings....About Phone.....Status.....SIM Status....(select SIM if you have two)....Mobile Network type.

You should either see EDGE or HSDPA there dependant on what youare connected too.

Mine looks like yours, but mine came direct from a Chienese internet mail order outlet.

T-Mobile configuration appeared automatically first time I connected with that SIM in place.
[Android General] Supracer:
Guys I'm in desperate help please!!! I'm trying to get cwm or twrp on my phone but can't flash em!!! I tried mobileuncle but gives just black screen! Terminal android not working gives me permission denied or unknown id flash_image and my PC just not working.....please help!!! (Crying)

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] Supracer:
Nobody?? Hello??

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] kokuo81:
Hey Supracer,

I didn't really get what your problem is. Can you boot the phone? What happened? Did you try to flash something? Which method did u used?

Cheers

kok
[Android General] Supracer:
Okay I had lewaos recovery on my phone with jb 4.1.2 custom rom and wanted to change my recovery to cwm.... So I used mobileuncle to flash recovery and next thing you know my recovery goes into a black screen.... I can boot normal my rom works super great but I got no recovery..... My question is how can I flash a recovery file from SD card without a PC because my PC is down and trust me if I had another one or use my friends computer I won't have this problem.... I'm having trouble flashing with android terminal and I do have 2 recoveries 1 cwm 5.5 and 1 twrp 2.2.4

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] wahyuwidi:
hi supracer, i try to flash cwm but its for jy g3 on my jy g2 and when i enter to cwm its just going to black screen to..can u give me the link to download cwm for jy g2? i will try to flash it trough my pc. :)
[Android General] Supracer:
http://dl.dropbox.com/u/8463704/recovery_cwm5.5.0.4_ENG.img

Here you go but help me please

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] Supracer:
Okay I just flashed lewaos recovery and it worked with mobileuncle but I still don't get why I can't flash twrp or cwm

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] yash.pranjale86:
Good but not great.

DONT FORGET TO HIT THANKS.......
[Android General] bas-r:
Excellent, thanks, I will test this for my GF's G2.

Is this prerooted and has it gapps installed?
[Android General] twrock:
I don't know if this will help anyone, but here's how I got the flash tool to work: http://xdaforums.com/showpost.php?p=37404357&postcount=2

(But remember, don't try to flash the wrong rom on your phone.)
[Android General] kokuo81:
Yes and yes :)

Cheers

kok
[Android General] bas-r:
I indeed experienced!

Thanks a lot for the guide, an excellent phone this turns out to be :)

My Huawei g500 pro, with similar hardware is lacking this update.. And will probably not be updated...
[Android General] Shahmatt:
Hi guys, I'm having this weird problem after flashing the ROM in kukuo81's guide.

My screen does not time out. I am currently switching off the screen using the power button when I am done with the phone.

Anyone else facing this issue?

Edit: Ok it seems to be working again after a restart. Thanks. :)
[Android General] abirjin:
Recovery

I have a Jiayu g2 dual core 512mb ram version and I have rooted my phone using the binary method, I want to install recovery on my phone but havent got a clue of what to install, I tried installing LEWA recovery but it was in chinese also found a LEWA english version which did not work, any idea which recovery might work on my phone? Thanks in advance
[Android General] kokuo81:
You have the jb 4.1.2 official update just 4/5 posts back. It will install the recovery and the phone will be automatically rooted :)

Cheers

kok
[Android General] abirjin:
sorry bro but I can not download from mega for some reason, can you please link me to the original file source? thanks in advance
[Android General] kokuo81:
Sure, np:

http://www.baidupcs.com/file/c7ee02...xpires=8h&sh=1&response-cache-control=private

Cheers

kok
[Android General] Kaiyoti:
Was hoping it would fix the intermittent vibration issue, but still the same. Still, thanks for the 4.1.2 update guide.
[Android General] Supracer:
Hey guys I've been trying lewaos for 2 days now and I have to say its a great rom to use daily.... Check it out

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] kokuo81:
Hey Sup, could you point us to the rom version you use with links :)

It would be even better to have them uploaded on Mega, but this is something I can do by myself once I have the rom :P

Thank you

kok
[Android General] Supracer:
this is for popular version: http://static.lewatek.com/yun/Jiayu_G2L_JB/LeWa_Jiayu_G2L_JB_ROM_13.02.05_7374d.zip

this is for the standard version: http://static.lewatek.com/yun/Jiayu_G2H_JB/LeWa_Jiayu_G2H_JB_ROM_13.02.05_33efa.zip

and this is for the single core version: http://static.lewatek.com/yun/Jiayu_G2_JB/LeWa_Jiayu_G2_JB_ROM_13.02.05_bd306.zip

popular version is dual core 512mb ram and standard version is dual core 1gb ram and this is the new lewaos jb 4.1

thank me if i helped anyone :D
[Android General] wahyuwidi:
how to flash it.. use recovery or flash tool?
[Android General] Supracer:
Recovery

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] jotaelle:
What recovery can i use in my G2L 512 mb?
[Android General] Supracer:
Any recovery you can use but with lewaos ROMs automatically install lewaos recovery 2.0

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] jotaelle:
Thanks, but i can install lewaos ROM with recovery or only with flashtool? If is posible with recovery, what is link of recovery?

thanks
[Android General] Supracer:
This is twrp recovery http://www.4shared.com/file/-7tpjQLW/ydss-jiayuG2-TD-recovery.html

And this is cwm recovery http://www.4shared.com/file/VwdfzhKe/recovery.html

You can download mobileuncle and flash them or use flashtool

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] aliaird:
Anyone else struggling to flash this? I can't get it to work. It fails during the process? I've tried a couple of ways with no luck. I've downloaded it a few times to ensure it didnt corrupt during download as well.
[Android General] gipower:
Hey, I also have jiayu g2 512mb. I have a problem with led wakelock when the battery drops below 15%. Is this problem fixed with JB 4.1.2.?

In this step i get an error. Is this normal? I installed the driver as you described in previous steps.
[Android General] Supracer:
Then use lewaos recovery to flash its in the zip file you downloaded

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] aliaird:
Cheers, will give that a go. Tried flash tool and CWM. Will give Lewaos recovery a go!
[Android General] Supracer:
Just to let you know its lewaos recovery 2.0 and in chinese but just use the first button on the left to install. I used 1.0 and in English but it work.... Not sure if it works with g2l but try to flash it cannot brick the device

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] aliaird:
Got stuck at the Frog picture on the reboot. Then got myself into a world of confusion somehow only being able to boot into recovery and getting a Chinese Lewaos Recovery for my troubles. Managed to find a pic of the English ROM online to work out an escape route and think i am OK now. Just flashing a restore from the backup I took before trying all this...
[Android General] Supracer:
Well? Everything worked?

Did anyone oc the phone yet????

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] aliaird:
I managed to use the Chinese LEWA 2 Recovery to flash an old ROM I had on the SD Card, then installed CWM and restored my cwm backup from first thing this morning. So back where I was this morning before I tried to install the LEWAOS ROM mentioned a few posts back.

Might try again, but when I have a few hours free of kids and nagging wife!!!
[Android General] Gamlasakernyasaker:
If I upgrade my G2 Jiayu 1GB RAM Dual-Core with android 4.0.4 without Swedish on the operating system to JB 4.1.2. Is it possible to get Swedish then? Would be much better with Swedish since I live in Sweden :)
[Android General] Supracer:
You can use more locale 2 app from the play store its free and you can use any language you want

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] Gamlasakernyasaker:
I tested it now, but the app does not change the system language :(
[Android General] Supracer:
I just tried it with lewaos and didn't work :s sorry dude but fore sure 1000000000% sure it works on normal custom roms

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] Gamlasakernyasaker:
Can you tip me what guide I can follow to change the ROM?
[Android General] Supracer:
Page 21 first post its a great guide to install jb by kokuo81

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] Gamlasakernyasaker:
Thanks! i will try.

---------- Post added at 08:53 AM ---------- Previous post was at 08:04 AM ----------

Well, now I have followed the guide on page 21 and Upgraded to 4.1.2 but there is still no Swedish to choose from :crying: Why is this so?
[Android General] Supracer:
Why not?

Jiayu G2 1GBRAM Dual-Core JB 4.1.2

---------- Post added at 10:06 AM ---------- Previous post was at 10:03 AM ----------

If its not working for you than I don't know what to say..... Go back to ics I guess if you need Swedish system language

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] Gamlasakernyasaker:
How do I do that?

I've never had Swedish in it, was deceived when I bought it, he said it was Swedish, but it did not.

How do I get ICS?
[Android General] Supracer:
Use Google translate and download this rom and flash it using flash tool http://forum.china-iphone.ru/viewtopic.php?f=70&t=21783

Jiayu G2 1GBRAM Dual-Core JB 4.1.2

---------- Post added at 10:43 AM ---------- Previous post was at 10:42 AM ----------

On page eleven I posted the instructions

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] Gamlasakernyasaker:
I can not find the ROM on that page, it looks like it has been deleted: (
[Android General] Supracer:
http://narod.ru/disk/64232547001.5bceb53f639fbf5e0dcc1a9fc94d78e1/Adapted_Firmware.zip.html

Its not deleted just you didn't see the link.... Use this rom for today and later tonight when I get home and I'll give you a link for a great ics rom in my opinion

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] Gamlasakernyasaker:
Okay, that sounds very good! Thank you! Now it has turned up another problem. I can not download the scatter file, it pops up an error message that I should check that the file is legal, sigh!
[Android General] Supracer:
Search in Google for mtk6577 scatter file

Jiayu G2 1GBRAM Dual-Core JB 4.1.2

---------- Post added at 12:17 PM ---------- Previous post was at 12:14 PM ----------

You should find one at xda haipai 710x forum or a site called moduco site

Jiayu G2 1GBRAM Dual-Core JB 4.1.2

---------- Post added at 12:52 PM ---------- Previous post was at 12:17 PM ----------

Well any luck?

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] Gamlasakernyasaker:
I do not know if I should just put it down, does not seem like it works with anything I do, very annoying. I downloaded the OS package you gave me the link, but the scatter file does not work there and I can find no other use. I use Flash_tool when I try. Maybe I'm stupid? : D Can you give me instructions, point by point?
[Android General] Supracer:
http://bm-smartphone-reviews.blogspot.co.il/2012/05/mt6575-flashing-tutorial.html?m=1

Read this carefully and it will work perfect and at the bottom there is a download link

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] Gamlasakernyasaker:
Yes I did exactly as the the guide but I can not. Check the picture.
[Android General] Supracer:
Than flash it with recovery it should work

Jiayu G2 1GBRAM Dual-Core JB 4.1.2
[Android General] Gamlasakernyasaker:
I'm so bad at this .. Can you explain how I do it?