Hello everybody

I have KD-43X8305C with firmware version PKG2.287.0010EUB and I can't update firmware with this version anymore, I try with USB stick but no update after many auto reboot.

When I try update on line with TV I have "error 2123" (server error) I don't understand cause

all online services work good on my TV (youtube, google play..)

Notice thaht I live in France.

Can Someone help me 

Regards