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iPhone 6S no Modem Firmware after water damage

Got a iphone 6s to repair from water damage.

After cleaning and removing a shorted cap near RF_PMU iphone went back to life, everything works except mobile network, it keep searching for signal and a message appears saying: “Mobile data update failed”

It have the correct IMEI set but Modem firmware is blank.

I reballed RF_PMU and baseband, no damage nor bad tracks, the operation resulted in same behaviour.

Is there any other IC responsible to Modem Firmware?

Contestado! Ver respuesta Yo también tengo este problema

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I had this problem once on a water damaged iPhone 6 after running the jumpers and re-balling the baseband CPU it still had no firmware. I replaced every chip under the bottom shield and it didn’t help. So I would defiantly say this is the baseband CPU or the traces under it. I wouldn’t spend any more time on this.

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That's bad news... The network issues are the worst and invalidates a phone.

I have another 6S that instant overheat when a SIM card is placed and reboot after a while, no network signal and have both IMEI and Moden Firmware (Not from water damage). Works totally ok without a SIM card. Any guess on that? Or can i use any chip exchange to recover the other?

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Tiago estará eternamente agradecido.
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