Hi,
Thank you for your comment. As you can see in the list of <a href="/open-devices/flash-tool/supported_phones/" rel="nofollow">supported devices</a>, Xperia E with model number C1504 is not supported. This means that unfortunately, we do not provide any way for you to go back to a generic Sony software. If you have any further questions, I recommend that you head over to our <a href="https://talk.sonymobile.com/t5/Open-Devices/ct-p/OpenDevices" rel="nofollow">Open Device forum</a>.
Best regards,
Anna from Developer World
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