I can't execute Huawei Update Extractor, so that would be very helpful (actually for many users I think).
Well, I just did it.
FWIK there are two ways of downgrading: modifying UPDATE.APP (the file OEMSBL_VERLIST) or manual flash. I tried the second method, as I could't calculate the MD5 and CRC of the files inside UPDATE.APP.
First you need to download Huawei Update Extractor from MODACO (sorry, I cannot post links as I don't have enough posts) and the latest version of adb and fastboot for your OS.
Then open Huawei Update Extractor, open UPDATE.APP and extract all the files inside it to a folder on your computer.
After that, connect the phone into USB Debugging Mode and reboot into bootloader ( adb reboot bootloader ).
Then just flash the following partitions with fastboot, in this order: boot, cust, recovery, system, userdata.
Finally, reboot into recovery, wipe data and cache and reboot.
This is how I downgraded from B156 to B127 (both downloaded from this thread).
Although it worked for me, remember: YOU ARE DOING THIS ON YOUR OWN RISK!
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