SE w395 on charging screen reads hardware error serious error stop charging stop using phone

can tel me how i update software k550i

The phone told you what to do. Don't charge it, don't use it, and call their support center. 1 866 766 9374 (Toll Free) - 1-877-7XPERIA (1-877-797-3742) should get you moving in the correct direction.

Serious error: stop charging. Stop using your...

This is a message that the phone is needing help as there is errors in the hardware or software.
soit will be good to have the phone checked for error codes so as to get the remedy from the Sony ericsson service centre.

could be the charger / phone or software ... take it to a phone repair shop but my guess is battery needs replacing

here is the solution for this problem Serious error stop charging

The software may be corrupt.
Go to sony ericsson.com
Download Pc suite & Update service.
Reinstall the latest software update, it will work.
If it doesn't, move to SE service centre for hardware check.

Turn off your phone and do not try to charge it. Take it to a nearest sony ericsson service centre.

This should be a hardware problem. Take it to the Sony Center.

i was charged my mobile k850i then one massage came my mobile seirious error,stop charging your mobile, stop using & plese contact sony ericsson call centre.