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When flashing an AOSP ROM on a CDMA phone, it's a win-some lose-some affair. You gain the functionality that comes with a pure Android experience. However, you traditionally lose USB Modem and Diagnosis Mode on your device. For those who are unaware, USB Mode and Diagnosis Mode are accessed via codes you enter into the dialer. This is not only required to activate the phone on some networks, but also helpful in alleviating some problems like restoring your IMEI using QPST. However, for many Samsung devices, that is no longer a problem. Now, you can get all this functionality back without flashing back to a stock ROM.
Are you a happy 4G (WiMax) user in the US? If not, it may be because of your Epic 4G's WiMax radio's performance. However, not all is lost because XDA member gokuman56 has written up a guide to improve a few things that have kept you from thanking your carrier for 4G. The guide will show you how, by modifying a few parameters in the WiMax programming section can improve both the quality of the signal that you obtain from the towers and also, the time it takes to re-connect if the connection was to get lost. The dev claims that the guide is relatively straight forward but you may still want to read up the procedure a couple of times before moving forward with the change. A few things are needed such as the MSL code, which can be obtained in a number of ways.