Tried updating M4 via Companion, got an error, unplugged the phone, now it wont start up

[BrokenXperiaM4]

So its as i said in the subject

I tried to update the telephone via the Xperia Compainon
I got an erron the laptop's screen, i forgot what it said.
I unplugged the phone, and now it wont start up.
The screen is white with black letters "sony" on it.
And it just keep trying to turn on, than off, and on, and so off.

What do i do, please help 

[Uliwooly]

@BrokenXperiaM4

Charge the phone with a wall charger for 1-2 hours > then start the whole process again. 

[CameronT]

Hi @BrokenXperiaM4,

Welcome to the community. I am sorry to hear about your M4.

If the process was interrupted during an update it may only be partially installed, which is why it cannot start. Please do as Uliwooly suggested as it is likely to resolve the issue. If this does not work, run a software repair using Xperia Companion.

[yashk98]

Hi,

whenever i try to install marshmallow update,after my pc sends to restart the phone, green light appears in the notification led and it does'nt restart !!! please help!!!

[Marcel5]

Yes i ried to make an software repair didnt work and yet i get only a white screen wirth blacl leters of sony. Ist is it software brick. Can i repait ii ore.. (I forgott my pin to ublock my phone ;() can i throw the phone AWAY

[StuartF]

You're stuffed mate - take it to your phone shop for them to repair.

I did this recently and I've had to take my phone back to the shop for a repair - fortunately the phone is less than a year old. It's the second time it's been in for a repair though...I hope it will be OK when I get it back. 

[CameronT]

I am sorry to hear that @Marcel5 & @yashk98,

If the software repair has not resolved the issue then you will need to arrange for it to be repaired by a technician. I recommend you contact your Local support team.