1 USB port charge but not recognise my iphone the othe one works fine

Hey guys,
I have MacBook Air 11-inch, Mid 2012
1 USB port just charges my phone but not recgnise it. I tried a flash drive and it didn't recgnise it as well
It was working well but all of a sudden it stopped working
please help

Try resetting the PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
After resetting NVRAM or PRAM, you may need to reconfigure your settings for speaker volume, screen resolution, startup disk selection, and time zone information. If issues persist, your Mac's logic board battery (not a portable Mac's rechargeable battery) may need to be replaced. The logic board battery helps retain NVRAM/PRAM settings when your computer is shut down. You can take your Mac to a Mac Genius or Apple Authorized Service Provider to replace the battery on the logic board.

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1 USB port charge but not recognise my iphone the othe one works fine

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