can not recover iPad goes to unknown error 52

iPad worked great for last 3 years , today suddenly black shutter screen came down on job sheet

battery was at 10 % so thought this strange as seemed as though had gone flat

re booted would not come up , charged for an hour

re boots but keeps dropping back to black apple screen

have re booted in i tunes did not cure it

now trying to recover and update with in i tunes but always goes to

unknown error 52 ??? after 6 minutes or so

main ipad screen is black with update bar just over half way stuck there

tunes shows its failed ???

any ideas or has a three year old iPad 3 died !!