Found a Chinese AOSP with apparent fix of the SD problem.
http://www.7to.cn/androidrom/romdetail/2932
From google translate
Download: http://file6.7to.cn/uploads/rom/201405/27/2932/7to_ROM_8297W_AOSP_V1.zip
http://www.7to.cn/androidrom/romdetail/2932
From google translate
The ROM based on the passage of the U.S. Great God F1 mobile version of the ROM transplant , the bottom package description please visit Cool Great God appearing F1 Andrews native system adaptation program 's latest source of extreme power saving is very smooth bottom bag SD card problem I during migration has been fully restored , the system can correctly identify the external SD card , and the card as the main card. Google native system is naturally very lean and smooth , are interested can download experience ! If necessary, the ROM will continue to update !
Google native 4.2 system
System is simple and smooth.
Has brought ROOT.
Try to keep all the features of the original system .
SD cards and other system functions properly.
Here is the end of the package features:
1 add the latest MtkTweakV14 ( performance optimization ) official version , MTK strongest power saving tool
2 Set the default memory mode 2G, ran distracted horses are clouds , easy to use is the last word
3 Integrated Boot saving technology
4 moderate streamlined system
5 Add ROOT privileges
6 debug mode is enabled by default
7 Turn on hardware acceleration
8 Join date hosts file to block ads
9 acceleration enabled by default Swap
10 Depth optimization system
11 . Improve system stability and fluency
12 Enhanced GPS satellite positioning
13 Enhanced 3G signal and WIFI signal
14 Join the best to listen to ringtones WhereGo
15 Join Oppo Find 5 comes with built-in ringtones Jumping Finger
16 Join Transformers music played in the Super Hornet
17 Join very evil ringtones, get ringtones seconds
18 Join Samsung GalaxyNote Whistle SMS ringtones
19 Complete add sony Bravia V3 display engine
20 Adding sony Xloud sound volume increases
21 Adding New ViPER4 Sound
22. Optimize the picture display to 100%
23. Enhance video quality
24. Enhance the photographic effect
25 Turn on GPU rendering
26 Modify the call volume series of 20
27. Turned init.d Service
28 Integrated latest busybox tools
Download: http://file6.7to.cn/uploads/rom/201405/27/2932/7to_ROM_8297W_AOSP_V1.zip