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Repair information and guides for the Apple iPhone 5s that was announced on September 10, 2013. Model: A1533, A1453, A1457, A1528, A1530, A1518

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No modem firmware and stuck on searching

Hello, my iPhone 5s shows searching after booting up and after 30 seconds it says no service or sometimes Cellular update failed error. I checked the about page in Settings-General and it does not show modem firmware but it shows IMEI. When I go to the phone app and dial *#06# just nothing happens. I remembered that my phone dropped in water like 1 month ago and nothing happened, but after 3 weeks I saw this error. When no service error started to appear, my phone sometimes was able to make or receive calls.

Any suggestions should be appreciated!

EDIT: I am using this iPhone as an iPod touch now and recently I noticed that every time I boot the device up it shows that Cellular Update Failed error even tho I do not have SIM card installed.

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Very bad sign. so Modem Firmware is located on BB_CPU and if you are not getting the firmware its a few of the following that can affect this

  1. BB_PMU is not working right therefore you may not be getting voltage to power the BB_CPU
  2. There is a issue with WTR and it is messing with the voltages of PMU
  3. BB_CPU needs reballed due to corrosion
  4. BB_CPU has a internal short

Either way this is a Motherboard that will need a Microsoldering Tech to repair.

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Thanks for suggestions!Is that BB_PMU and BB_CPU replaceable? And could Jailbreaking damage it?

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