HELP ......................Xperia Arc S want Increase Phone memory topic

Hello all ,
First About My Phone..
Xperia Arc S (LT18i)
Android version - 4.04
Kernal Version - 2.6.32.9-perf BuildUser@BuildHost#1
Build No. - 4.1.B.0.587
Sd card Class 4

Purpose - Want to increase internal Phone Memory
Try everything like ...
1) Make Extra partition via mini tool & make access to link2Sd method (Result: Fail)
2) Ram Booster app (result Kernal not Supported)
3) Some times many other app says memory card must be higher then class 6

Also trying to update kernal but completely confused what to do.............. even one time made my phone in dead state but hope fully recovered from flesh tool .......................... now my mind completely wipe out ....................

.PLZ HELP SUGGEST ME RIGHT WAY>>>>>>>>>>>>>>>>>>