[Samsung Epic 4G Touch] Just_s:
Wow, I've been away all day and just catching up with this thread and a few others and I think everyone needs a timeout LOL. There is massive frenetic energy and a ton of misinformation going on here. Maybe Calk needs to put up a PSA in the OP.

Some important considerations:

(as always, make a NANDROID before you do anything!)

► The New Modem - First, do not run out and flash the EG31 modem just for the hell of it. Use some restraint and think before you act. There is no return from the EG31 modem to EG30. You can get back to EG12 but unlike EG31, the issues with EG12 are well documented rather than speculative. I would advise you try everything below first and if all that fails to help, the EG31 link is at the bottom of the list.

► LoS issues - If you are having LoS issues flash a stock kernel! I prefer Rogue *STOCK* v1.1, but pretty much any kernel listed as "stock" should help.

► Data/signal Issues - If you are having data/signal, perform a Hands Free Activation, if that doesn't work, try pulling the battery for a few seconds (thanks Guillo1). If that still doesn't work you may need to call Sprint.

► Still LoS - If you are still having LoS try -viperboy-'s LoS Tracker script. It works.

► Poor Battery Life - If you have poor battery life make sure you have calibrated your battery and given yourself several full charging cycles. And use either Battery Repair (Doctor Boost) ($2.69) or Battery Calibration (FREE). User evolart passed on this method as well. I'm not quite ready to believe that calibration does nothing for us, but this is an alternative method to try for those who feel compelled. Best way to calibrate S2 Battery. I sent messages to both app developers. I'll test and keep an eye out for other user's opinions and update this as necessary.

► Bootloops? -

Make sure that you have a default launcher selected and if using a 3rd party launcher that it is NOT set to auto update in the market as an update overnight would leave you without a default selected. (Thanks to 1BadHEMI, rickyq12 and playya for jogging my memory.)

If that didn't solve it and you are absolutely sure you wiped properly, you probably didn't so you might want to try that again. Recovery > Wipe Cache + Dalvik cache > Reboot (see Issues Flashing ROM below re: wiping)

If that doesn't work, flash a stock kernel via recovery or odin and start from fresh ROM again. This time let everything settle in before applying any changes (voltage tweaks, themes, mods, new apps, restoring settings, etc.)

► Issues Flashing ROM - If you are having issues flashing a ROM or an update here are some tips.

With Calkulin's ROMs, you generally do not need to wipe anything when going from one version to another. Just boot into recovery and apply the zip, it wipes for you. I have had the most success doing this and Calk will note otherwise if the process changes. (You might want to wipe cache + dalvik cache if going between regular and bare versions.)

If coming from another ROM to another, you should wipe everything. I do it manually and use the Format_All zip, but you can do it anyway you like so long as everything (cache, dalvik, system, battery stats) gets wiped at least once. And probably format system for good measure.

If you have done either of these processes and are having issues it could be anything from a bad download to wiping issue to bad luck. Do it again and take a look at the Bootloops note above.

► Google Voice - when I answer my phone I get a recording where I have to press 1 to answer

Open Google Voice > Options (gear icon top right) > Voice Settings > Calls > Call Screening > toggle to "Off"

► Apps Issues - Apps missing, not working, acting strangely?

Reboot your phone

Reboot your phone

Reboot your phone

Fix permissions (ROM Manager > Fix Permissions or boot into recovery > Advanced > Fix permissions)

Clear app data (Settings> Applications > Manage applications > All > [the app] > Clear data)

Uninstall and reinstall the app

If it is something like Google music, Amazon Appstore, Spotify, etc. you may need to go to the web and clear some connected/authorized devices from the settings, there is a limit.

► Fresh Start - If you've tried everything else, try flashing the STOCK EG30 TAR via Odin. This will help you start fresh.

► Last Resort, try going to the EG31 modem. But if you have issues, don't *****, just go back up to the top of this list and start the process again.

► More Links And a whole bunch more useful links in qbking77's thread and my HowTo's post.