Depends if its a hardware or software issue you have. Sticky or failed buttons etc you wont have an issue.If I take my phone in for replacement with Ios7 installed what would they say?
Could they tell I don't have a dev account?
personally, i dont think they would care since its not a modified or JB device. its an OEM apple ios version. and i highly doubt they will check his UDID or dev status, they are gonna wipe the phone anyways.Downgrade ASAP to 6.1.4. If you don't have a dev account, your warranty won't be honored if you take you rphone back with 7.0b1 on it.