Note that there are two YowsupEnv implementations at: yowsup/env, specifically: env_android.py and env_s40.py.
First, change the values of the following attributes at env_android.py:
_MD5_CLASSES = "7UDPOXwpiLBvEjT8uNwsuA=="
_KEY = "eQV5aq/Cg63Gsq1sshN9T3gh+UUp0wIw0xgHYT1bnCjEqOJQKCRrWxdAe2yvsDeCJL+Y4G3PRD2HUF7oUgiGo8vGlNJOaux26k+A2F3hj8A="
_VERSION = "2.12.440"
Then, you'll have to tell Yowsup to use the Android environment instead of the default S40 environment. To do so, modify the files:
yowsup/registration/coderequest.py
yowsup/common/http/warequest.py
In both of them, replace the variable:
CURRENT_ENV = S40YowsupEnv()
With:
CURRENT_ENV = AndroidYowsupEnv()
Don't forget to also change the corresponding import statement as:
from yowsup.env import AndroidYowsupEnv
That should do the trick.