Chosen Solution
i have problem with my iphone 7 plus its before working fine ,but hen itry it updating it itunes give me error 2009 , and now i am trying to resote in 3utools its stuck at 19% and give me error -2 , when i try to restore in itunes after extracting firmware verifiying and restore the does not show progres bar of restoring and give error2009 , i am also chnge battery ,usb cable change ,also reball nand and program it , but same
There is no quick solution for this. You need to find what is causing the USB connection to drop.
Try to put your device in recovery mode and set it up again.
