Dual Booting ICS and JB on Galaxy Nexus Using Bootmanager

I downloaded boot manager from the market and tried to dual boot JB and ICS rom but it just bricked my phone and I had to repair my boot.img by re flashing it from /sdcard/bootmanager/phonerom/update.zip

I also tried installing a new rom from a nandroid, and flashing from zip, flashed ICS tried to flash another ICS  nothing happen, deleted boot manager and its files, wiped data, installed it, did the above all over again for almost whole day and in the end I give up.

my point of view, boot manager is too buggy and I don't know how exactly some people got this to work on galaxy nexus.

if you know how please leave a comment below and help me and for sure this page gonna be a reference for someone else.

Sony Walkman for Galaxy Nexus

Finally you can have the beautiful Sony Xperia Walkman player and it's visualization  in your Galaxy Nexus.
Should work on ICS and JB all kind of roms. if it didn't please comment below, and if it did please also comment and tell me if it works correctly.
the only thing that wont work are widgets.
Just download and install using any file manager u have.

Then enjoy :)

DOWNLOAD:
Walkman APP
Visualizer