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i replaced the u2 ic of an iphone 5s this is my first experiance with the u2 ic i think i have miss placed a tiny resisitor near u2 ic when i try to boot the 5s it stays at the apple logo, can i jumper that part and boot.

Nipuna Dharmewardene definitely not until at least you find out what it is. It is never a good idea to apply jumpers across components. You will most likely shorten out the board. Let us know which “resistor " this is and if you do bnot know post a couple of images with your question, showing the location of the missing part on the board. Use this guide for that.