iPhone 6 plus stuck in DFU mode after replacing touch ic
I have fixed many iphones and I am good in microsoldering. I received this iPhone 6 plus for touch ic disease. When I opened the phone I noticed that some other technician has tried to re-hot the ic by using lots of Flux all over the board.
So I replaced the Meson chip to fix the touch issue. When I turn the phone on, it didn't turn on. I checked most of the required voltages and there is no shorting. When I connected the phone to computer, it detects the phone in DFU mode. There is no option of update.
What area, components or ic chip is responsible for DFU mode? Customer doesn't want to loose data that's why I didn't try to restore.
Has anyone encounter such a problem? Please share and help me to solve this issue.
Is this a good question?