How to open Oracle 11.2.0.4 datafile in 11.2.0.3 binary?

Hi:
we are doing Oracle upgrade for our client from 11.2.0.3 to 11.2.0.4. The client has a request, that after upgrade (database open to user access and new data will be entered by users during that time), they want to switch back to old version of Oracle in 11.2.0.3 AND use new datafile (version=11.2.0.4). We are now testing this. Our question is: can we do that? does oracle allow such operation or not?
The point is the database will be used by client for a few days after DB upgrade(11.2.0.3=>11.2.0.4), and we don't know what type of data they enter, we are not sure if this will damage database SYSTEM file or not.
Today we tested the following command in out testing environment:
STARTUP NOMOUNT pfile='path_to_11.2.0.3_initSID.ora';
ALTER DATABASE MOUNT;
ALTER DATABASE OPEN; * (*we found out that the command failed, then we run this command):
ALTER DATBASE OPEN DOWNGRADE;
SELECT STATUS FROM V$INSTANCE; ---> (it shows OPEN MIGRATE status).
So DB is not open!!
Also we think 2nd solution of
1. create new control file at 11.2.0.4 $ORACLE_HOME for latest oradata file,
2. copy latest 11.2.0.4 redo logs to old oracle_home (11.2.0.3)
3. open the database by 11.2.0.3
is the above approach correct or not? is there any problem of inconsistent SYSTEM file, and will this approach solve it or not?
thank you very much!

To go back to old version (without changing compatible parameter), you can perform downgrade.
Instructions are available at
How to Downgrade from Database 11.2 to Previous Release (Includes 11.2.0.4 - 11.2.0.1) (Doc ID 883335.1)
In this case you will having all the data file including the new one.
But remember database may not be in the same status as before (Before upgrade). it may have invalid objects of higher version after downgrade.
Downgrade is applicable only to successfully upgraded databases. In case upgrade faced some issue, do not try downgrade there.
Your second approach it not correct. Note that each datafile header will have db version. We can not open database in normal mode when header version and binary versions are different.

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