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HomeClockworkMod (CWM) Recovery easy install for RK3066 and RK3188 -- TWRP/CWM Flash-Tool and root for RK3288
 Please donate to support OMA and CrewRKTablets firmware work, thank you !
Contributor
2013/04/11
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Hello owners of the JXD S7800B with 8GB, hello Oma and hello to the Crew,
first I want to thank Oma and the Crew for their genial work on porting high performanced roms to cheap devices, mostly imported from China.
I puzzled up your great efforts to a working single firmware.img of “Oma_RK31_Chuwi_V88_CM10.1_4.2.2_v1.3.2a″ for the gametablet JXD S7800B with 8GB nand which can be flashed through RKbatchTool easily. Oma agreed to share the files with you:
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Rom 1 for 2013-models:
- Old kernel 1.0.9 (vsync 60 Hz)
- 1.6GHz CPU
- Working Headphones
- Tincore Keymapper is mandatory for proper joysticks
Oma_RK31_Chuwi_V88_CM10.1_4.2.2_v1.3.2a_for_JXD-S7800B_Kernel-1.0.9
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Rom 2 for 2013/2014 models:
- New compiled kernel 1.5 (vsync 60 Hz, audio denoise, power-button-debug).
 Big thanks to lujji for compiling this amazing kernel and for allowing to use it in my firmware images.
- 1.6GHz CPU
- Headphones need to be started manually through widgets from apps like "SoundAbout" from Playstore
- Tincore Keymapper is optional for proper joysticks
Oma_RK31_Chuwi_V88_CM10.1_4.2.2_v1.3.2a_for_JXD-S7800B_lujji-Kernel
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Please read the information.txt on how to install. The general functions of Android work great an on a very high performance with this rom on my device. But mp3 encoding does not work (easily use JetAudioPlayer for playing music). An additional benefit in Rom 2 is lujji's kernel which gives you a correct vsync and 1.6GHz clockspeed and audio denoise with the latest stockrom for 2013/2014 models (Also the so called T-models).
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ALL THANKS GO TO OMA AND CREW RKTABLETS FOR PORTING THIS NICE ROM ! GREAT JOB ! IF YOU LIKE THIS ROM MAKE A DONATION AT Crew RKTablets . I ALSO THANK LUJJI FOR HIS AMAZING JOB ON THE KERNEL USED IN ROM 2.
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Screenshots:
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Other recommended firmware images for S7800B:
JXD S7800B Gamepad 8GB - Original Firmware V.1.5 with kernel modification
The following users say thank you to pogodancer for this useful post:
admin, lujji, Oma7144, jcelis
admin
2010/09/11
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Thanks for that pogodancer, nice work 
I see there might be some picture/text centering issues on your posts, you may have a look there:
http://www.arctablet.com/blog/forum/arctablet-website/uploading-imagesfiles-on-the-forum/
Â
Cheers.
If you like our web site, applications and firmwares, feel free to support our site. Donations are used to pay the bills for our server hosting costs, development tools and purchase new tablets to support.
Contributor
2013/07/09
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So the headphones don't work with the kernel built from source? Hmm.. I thought this problem was present in KK only. Could you tell what changes have you made to port this rom?
Contributor
2013/04/11
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@ admin
First I thougt I have done something forbidden. But now I understand. I corrected the alignments. Thank you very much.
Contributor
2013/07/09
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You can force the driver to route audio output into headphones. This can do it for you. In fact there is also an app called toggleheadset2 which aims to solve this problem for JB.
But the rotation is not perfect and mp3 encoding does not work
There is a rotation fix for CM10.1 on crewrktablets downloads page - have you tried it?
Contributor
2013/04/11
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Hi lujji,
yes I tried the rotation fixes. Oma has offered to build a special rotation fix for our device.
And your idea with the headphones apps is great. I just tried the SoundAbout app and could successfully give all sound-outputs to the headphones. That means that the headphones work but they will not be found when plugged in. That is on the one hand a success but on the other hand I don't know what to do to make the headphones working normally in this (and maybe all other) roms.
Thanks.
2014/11/20
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hi, i'm trying the Rom 2 for 2013/2014 models but i found an important bug: there isn't sound from the speakers when you resume from the automatic 1 minute sleep. If i put the device in sleep pushing the power button, the resume is fine.
the bug happens only after you browse your system app dashboard or run an application and you let the automatic sleep goes on.
if i restart the device audio will turn on.
Â
thanks
Contributor
2013/04/11
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@ bubu8
You are lucky because on my device headphones don't work at all.
Try the SoundAbout app. It's the only app in the Playstore which works for me. But maybe other apps work on your device also. Imho it is a good solution to start and stop headphone-out via app.
2014/11/20
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pogodancer said
@ bubu8You are lucky because on my device headphones don't work at all.
Try the SoundAbout app. It's the only app in the Playstore which works for me. But maybe other apps work on your device also. Imho it is a good solution to start and stop headphone-out via app.
i'm not using headphones, but integrated speakers
all i refer in my previous post is for speakers
Â
thanks
Contributor
2013/04/11
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@ bubu8
Sorry I misunderstood.
You could try the SoundAbout app to turn on and off your speakers manually.
Contributor
2013/04/11
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I recommend the SoundAbout app from Playstore. It is the only app which is working to turn on/off sounds for headphones and speakers.
Furthermore I exchanged some drivers from the stockrom for a better performance and updated the firmware in post #1.
Have phun.
2014/10/24
Offline
pogodancer said
I recommend the SoundAbout app from Playstore. It is the only app which is working to turn on/off sounds for headphones and speakers.Furthermore I exchanged some drivers from the stockrom for a better performance and updated the firmware in post #1.
Have phun.
hello friend pogodancer, one of the best rom I tried. but there is a solution to the perdidad sound from the speakers after sleep without using the Soundabout application.
You can make a fix to this bug only to speakers and is a perfect rom!
thanks for your great work
Contributor
2013/04/11
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@ jcelis
Thanks. But I tried a lot of this. The sound does not match correctly with the new kernel and Oma's customs roms. I do not have any idea to solve this. I think just Oma or lujji can help about this issue.
Sorry to say that. Let's hope for help to get it working soon.
Contributor
2013/07/09
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Jochen Kauz agreed to help and take a look at the sources. Guys from the crew have a lot of work to do with other tablets so I don't want to rush anyone. Let's be patient.
The sound does not match correctly with the new kernel and Oma's customs roms. I do not haveÂ
I think he wasn't referring to the headphones bug. Apparently, there is some sort of a problem with sound not working after resuming from sleep.
2014/10/24
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lujji said
Jochen Kauz agreed to help and take a look at the sources. Guys from the crew have a lot of work to do with other tablets so I don't want to rush anyone. Let's be patient.The sound does not match correctly with the new kernel and Oma's customs roms. I do not haveÂ
I think he wasn't referring to the headphones bug. Apparently, there is some sort of a problem with sound not working after resuming from sleep.
exact lujji, speakers sleep after the device not working
excuse my bad English
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