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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?
Maryam, Now your phone on download mode. just remove and reinsert the battery. Press power button and phone will be boot as usual.
Try pressing the volume up button + Home + power button
How to solve this problem To on my phone samsung mega i need to connect to power bank and than press button power+volume down+home. After press 3 button message appear Warning !!A custom OS… I select Volume down to restart phone . After restart my window pop up. My battery appear 100% I cant boot my phone without support power bank /power supply and when press power button nothing happen . Any solution
