Why has my Nexus 4 update failed?

[jrtrudel]

Need Help :Nexus 4 update fail. Cell do not boot anymore...

Hi everybody!

I just try to update my Nexus4 to Androids 5.1 lollipop with Nexus Root toolKit. But during the process I got this message and the update stop :

"error sending 'system' (809729 KB)...
FAILED (data transfer failure (Unknown error))
finished. total time: 42.739"

I try many time but it always fail and now my cell do not boot anymore...

Someone can help me???

Thank you in advance