Xperia 10II blank after installation got stuck in 70%

General
1

After trying to install the last upgrade 4.2 with settings, I likely could install 70% of the upgrade with ssu re 4.2.0.19.
when it stops in 70% for long long time, I decide to close off the phone and when trying to open it again , it ask me the security code and after that it gets blank.

is there something I can do after this brick

2

Iam trying to get into fastboot pushing down the volume and connecting the computer to it, but nothing happen.

3

I have pushing the bottoms in a crazy way and luckily it becomes blue, so I have download again the 4.1. So I am gonna try again to upgrade.