[Custom Rom] KitKat Custom Firmware (Android 4.4.4) for JXD S7800B

Based on stock Android 4.4.4 (KitKat) firmware.

Current version: 1.4 [24/02/2015]

Disclaimer: if you need stock mapper functionality, then this firmware is not for you - consider this rom by pogodancer instead.
http://www.arctablet.com/blog/forum/crewrktablets-rk3188-entwicklung-customroms-development-croms/jxd-s7800b-gamepad-8gb-kitkat-stock-rom/





Features:
• Custom kernel ported to KK and built completely from scratch
• Max. CPU frequency at 1.6GHz (with optional overclock)
• Improved 'interactive' governor - less lag
• Improved battery indication
• Fixed loud click when headphones attached
• Updated Wi-Fi drivers (v. 3.50.WFD)
• CIFS and UTF-8 support
• App partition from 2GB up to 12GB
• Root (SuperSU)
• Play Market compatibility (spoofed as GT-I9300)
• Minimum preinstalled content

Other features:
• Refresh rate is 60Hz (lcd driver from my JB kernel)
• Power button works
• Headphones work
• Right stick range is correct
• HDMI: reported to be at 40fps

Installation:

1. Open RKBatch Tool and connect usb cable.
2. Hit 'Switch' after pink icon lights up. Install drivers if needed
3. Hit 'Restore' after green icon lights up and wait for flashing to complete
On the first boot SuperSU will prompt you to update binaries - choose 'Normal'. No internet connection required
To install updates put the package in 'quickflasher' folder on the internal sd, open Quickflasher, set device to 'Rockchip Universal' and select the package you wish to install.

Some newer devices might have problems at 1.6GHz. If you experience any stability issues then lower the frequency in No-Frills and check 'set on boot'.

Overclock:

This rom comes bundled with 2 kernels: default and overclocked (1.7GHz for T-models and 1.8GHz for non-T) with reduced CPU and GPU power consumption. Use Quickflasher to install the kernel.
Use No-frills to adjust frequency. I do not recommend clocking CPU higher than 1.6GHz. Overclocked kernel might not run stable on your device.
Do this at your own risk!

Recommendations:

• To make installation process easier stock recovery was used. I suggest installing CWM Recovery from CrewRK instead.
• To launch Tincore when 'mapper' button is pressed go to Settings, select 'Open mapper on sequence', type in 'F12 1' and save. 'Invert X' and 'Invert Y' must be enabled in 'devices: touchscreen' for proper operation.
Also disable on-screen controls if you wish.
• Set CPU governor to interactive and scheduler to deadline.
• If you want to enable navigation bar then uncomment the line qemu.hw.mainkeys=0 at the end of build.prop and restart. Further adjustments can be done with Xposed framework.

Preinstalled content:

CifsManager, CM File Manager, No-frills CPU control, Tincore Keymapper and QuickFalsher. These apps can be uninstalled.
Tincore Keymapper [new version available]: https://play.google.com/store/apps/details?id=com.tincore.and.keymapper
If you need help with settings, make sure you visit wiki page.
Tincore Quickflasher: https://play.google.com/store/apps/details?id=com.tincore.and.quickflasher

Download links:
http://goo.gl/TMkUlr

Alternative installation method [untested for 10-14GB]:
You can select from 2GB up to 12(14?)GB NAND if you are not happy with the default size. Read the instructions inside
http://goo.gl/XAv96P

Latest update:
Update 1.4 [24/02/2015]
(install via Quickflasher)

Code: (Changelog) [Select]
1.4:
- swap can be selected from settings menu
- fixed ghosting battery icon
- device spoofed as GT-I9300
1.3:
- more smooth video playback
- removed duplicate GPU frequency
- battery indication adjustments
1.2:
- added USB drive support
1.1:
- adjusted battery indication

Fonte: http://boards.dingoonity.org/jxd-devices/(s7800)-kitkat-custom-firmware-(android-4-4-4)/

Ótimo post! pena que meu último JXD com problemas na rom (power/sleep button) já foi vendido...