battery & update problem

[#1]

hi i have problem with my xperia neo and that is :

my battry is stuck at 85% it always show 85% and when my battery is full or empty it shows 85% and when its become empty my phone turn off without warning and when i put it in charge it begin with 85%

i must tell u that i reset it to factory mode but still have the problem

i also cant update it i dont know why it said update faild with pc or with phone by himself

help me plz

thx

[Sam]

Have you tried using the Update Service instead of PC Companion to update the phone?

http://www.sonymobile.com/global-en/tools/update-service/

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[#3]

yep i try thats not working too

and i must tell u that i cant hard reset it too

i mean i hold 2 button on left and right and tap on power key when the phone is off but nothing happend

just a flash of blue light on power led

do u have any other suggestion

P.S : i gave my phone too someone and he install persian languege for me and after i reset my phone to factory setting it still remain that was why i try to hard reset it i think thats problem and i cant remove it

thanks