[Samsung Galaxy Player 4.0, 5.0] da1writer:
Egad man, you must be a new bloke!

Jokes aside, I can't vouch for you in your app situation but something went odd when I flashed my first rom on the SGP 4. Most said youtube HD would install but the one I flashed "Ethereal Rom" kinda didn't but later I found out it was because I played with the youtube app on the stck rom before shortly flashing. So I thought to just flash the rom again to maybe fix the app issue - instant brick. I used odin for crying out loud, I thought it was safer than cwm.

So like most people I tried to find a "Recovery thread" here in the forums. Found it in the Development portion of the forums inside the All in one thread that is stickied near the top. I decided to flash a pit file that was recommended to me and flash a tar that had "everything in it" to flash back to stock rom. No go, infinite loops in recovery and cache and blocks just wouldn't fix no matter how much I wiped. I thought to myself - holy crap, I'm going to either have a new paperweight again (Bricked two PSP's on my own) or I'm going to have to send it to Samsung and have to pay for them to fix because they will instantly know I rooted my device. But then I noticed something in the Recovery Forum... Something called Heindall.

So for now, I'll give you the two links that you must have before jumping into the flash guide.

1. First Download the Pit (US) here - http://www.mediafire.com/?kjzdabdkg2p6jth

2. Then Download the Full Recovery file for the SGP4 (US) here- http://www.mediafire.com/?c76jdkgkn7qf310

3. Extract the Recovery as a folder with winrar ( download and install from rarlab.com) or 7zip ( download and install from 7-zip.org)

You should have a Folder with 5 items in it now.

4. Now place your device into download mode (Hold Power and Volume down button until you see an android with a shovel)

Now run through these steps below (original link here - http://xdaforums.com/showpost.php?p=23290275&postcount=2) :

1. Download heimdall from here: http://www.glassechidna.com.au/products/heimdall/

2. This is a first time installation only. Extract heimdall, go to your drivers folders and run zadig.exe Install anything samsung related. (do this when in while in download mode.)

3. If you receive errors concerning the drivers install them anyway. (THIS IS NORMAL.)

4. Open heimdall-frontend.exe.

5. Go at the flash tab and chose the .pit according to your device.

6. After add the following partitions in the following order:

(Press drop down menu on the left to change)

PARAM: param.lfs

[Press Add]

CACHE: cache.rfs

[Press Add]

DBDATA: dbdata.rfs

[Press Add]

FACTORYFS: factoryfs.rfs

[Press Add]

KERNEL: zImage

7. When that is done double-check (just to be sure you're not obligated) ensure that re-partition is CHECKED!

8. Flash!

9. You should not have any errors but if you do have errors concerning can't mount cache (or something like that) Just wipe data is necessary.

10. You should have a like new device!

This worked for me and if I run into any bricks, I always revert to this. Make sure Kies while installed in your computer, just close anything inside your Computers Taskmanager that has anything with the word kies in the name, it conflicts with both heindall and Odin for some odd reason - remeber this for future rom /kernal flashing as this could be the reason why you currently are having problems.