The Samsung Galaxy S4, model i9505, features a 13-megapixel rear camera, and a 5-inch 1080p display.

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"WARNING...Custom OS can cause problems"

Hi I have Samsung Galaxy s4 and it has this problem with OS and shows this when i turn on "WARNING...Custom OS can cause problems" but i accidentally pressed the volume down button and now it's not turning on. Can you please tell me what to do?

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Were you doing anything prior to the issue? Installing a custom OS like cyanogenmod?

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I had this warning when booting up my phone this morning, thought it was a virus. I took my battery out and wait a few sec. Put it back in and it's back to normal.

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Maryam,

Now your phone on download mode. just remove and reinsert the battery.

Press power button and phone will be boot as usual.

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Try pressing the volume up button + Home + power button

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Maryam will be eternally grateful.
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