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why after i update my phone to kitkat 4.4.4 i can't use my OTG?
Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
Sorry to hear that you have issues after the update.
Could you elaborate on what's not working?
First try forcing a shutdown of the phone by holding the off button under the cover for the SIM-card and see if that helps.
If the issue remains i recommend that you try performing a repair of the phones software using a computer but please note that this will reset your phone. You can download software for this from http://support.sonymobile.com/global-en/xperiam2/software/