[Huawei MediaPad, T-Mobile SpringBoard] potatohead:
B008 Full Flash (Public Release)

Apparently, Huawei has deemed the latest B008 version to be stable enough for public consumption and thus has released it as the final (for now) EMUI 3.0 / 400 dpi ROM for Mediapad X1 503L.

For full ROM download, kindly visit:

http://www.emui.com/nsp/geturl.php?path=7D-503L_EMUI3.0_Android4.4_V100R002C208B008.zip&rid=902

(kindly note this is a FULL ROM, not an incremental update. Flash as per how you would normally flash a full rom; remember to backup your data prior as flashing a full rom most probably will wipe your data)

Another leaked official beta ROM from Huawei for 7D-503L.

The main feature in this ROM is EMUI 3.0, for those who are still in the dark, EMUI is the skin which Huawei applies over stock Android, think Sense for HTC, Touchwiz for Samsung. EMUI version for current ROMs is 2.3 for KK and 2.0 for JB.

This beta ROM is 4.4.2 based and uses a framework of 400DPI.

B002 Full Flash

https://www.mediafire.com/?vs4m59rw9rhgz1b

B005 Update (this is an 80MB update, your 503L needs to be already on the B002 ROM above to be able to flash; flashing procedure as below, thanks to bthoven)

http://www.mediafire.com/download/wbuuxnj035wenwf/7D-503LV100R002C208B005.zip

1. Create dload folder in internal sdcard

2. Copy the whole b005 zip file to dload folder (don't unzip it)

3. Rename the b005 zip file to update.zip

4. Local update

http://xdaforums.com/showpost.php?p=56766405&postcount=56

B005 changelog (edited the translation provided by bthoven through Google translate; changelog is for the 3G version of Mediapad [501u], but I believe it is the same for the 4G 503L)

http://xdaforums.com/showpost.php?p=56742863&postcount=51

Newly added options:

1. Added 4G only (for 4G model), 3G only option

2. Added option to turn on the screen when a new message has been received

3. Added speed dial function to dialer interface

Important optimizations:

1. Optimizes memory allocation and management strategy

2. Optimizes the UI layout and icon adaptation

3. Fully optimized system stability, fixed rare instances of phone hanging and other problems

4. Optimizes network search time

5. Optimizes power consumption during phone standby with screen off when data is switched on

6. Fixed silent installation problem for App Store

7. Fixed delay reception of WeChat messages

8. Fixed various UI performance problems i.e. screen lagging when scrolling list of installed apps or when returning to home screen from web browser and also other instances when the phone appears unresponsive

9. Adjusted the indications layout for data services

B006 Update (this is an 60MB update, your 503L needs to be already on the B005 ROM above to be able to flash; flashing procedure as below, [similar to that of flashing B005])

http://www.mediafire.com/download/phch2tjcutwfddh/7D-503LV100R002C208B006.zip

1. Create dload folder in internal sdcard

2. Copy the whole b006 zip file to dload folder (don't unzip it)

3. Rename the b006 zip file to update.zip

4. Local update

B006 changelog

Important optimizations:

B008 Update (this is a 35MB update, your 503L needs to be already on the B006 ROM above to be able to flash; flashing procedure as above, [similar to that of flashing B005/6])

http://www.mediafire.com/download/pb2o5921kja1m61/7D-503LV100R002C208B008.zip

For more pictures of EMUI 3.0 in its full glory, do visit this thread - http://cn.club.vmall.com/thread-1397354-1-3.html