Chosen Solution
Mudar para português iPhone came up to me with error 56, reflow nfc ic and work. Now the device is searching, modem firmware, imei show in about. sim card ok *# 06 # no show Any idea?
The signature problem is very difficult to repair, most shops no longer offer this repair. In short, you need to remove the baseband CPU, reball it, add long jumpers for the U1 and V1 pads, and then reinstall and if not solved investigate the 20 other pages of schematics that control the radio frequency functions of the iPhone. This is what this repair looks like. We don’t do it anymore. https://www.youtube.com/watch?v=OwYyfWRA…
