Iphone 4s restore error -1

i have iphone 4s which give error -1 while restore ……. i tried via different tool but not success ….. from 3u tool cound complete baseband data and stuck at 99% and gives error -1 and same in itunes …………………

tried many thing changing battery, changing charging flex…. reflow banseband chip but not success and gives same error

What to do now …expert’s help needed