Disassemble a Sony Ericsson Mobile Phone

[jasmin]

Look here:

SonyEricsson Hardware and Firmware Definitions!

EROM = Extended ROM. This is the base part of the software which isn't flashed in normal update operations. It controls the flashing interface, the boot loader, etc.

And tutorials how to flash:

XS++ 3.1 Guide-Flashing,Customizing,Recovering

or

Flash your phone and How to apply or remove patch using SETool 2 Lite

But first read this:

How to get access to download section

and

Forum Rules

Nice day