[Samsung Galaxy Player 4.0, 5.0] SerkTheTurk:
So I did the logcat when I hit the bootloop, and heres what came up:

--------- beginning of /dev/log/main

E/ ( 1): scan_device!!!

--------- beginning of /dev/log/system

E/ ( 1): DEVENC:fn_unmount_dev: Error [Invalid argument] unmounting /efs.

E/ ( 1): DEVENC:fn_unmount_dev: Error [Invalid argument] unmounting /efs.

E/DataRouter( 1183): Main entered

E/DataRouter( 1183): Data Router: INIT+

E/DataRouter( 1183): dr_pcsync_init

E/DataRouter( 1183): dr_init_pcsync_ipc

E/DataRouter( 1183): dr_pcsync_launch

E/DataRouter( 1183): [*] dr_smd_ril_open_client sucess 34388

E/DataRouter( 1183): [dr_smd_ril_init] dr_smd_ril_open_client successful

E/DataRouter( 1183): [*] RegisterUnsolicitedHandler() successfully done

E/DataRouter( 1183): [dr_smd_ril_init] dr_smd_ril_register_UnSol_Hdlr successful

E/DataRouter( 1183): [*] Connect_RILD() error 4 retrycount 0

E/DataRouter( 1183): dr_pcsync_monitor

E/DataRouter( 1183): Waiting for connection request

E/DataRouter( 1183): Value of server socket is 11

W/Vold ( 1177): Duplicate state (1)

E/notified_event( 1178): Collection::notifyDUNConnected -> connect error

E/notified_event( 1178): Collection::notifyDUNConnected -> connect error

W/Vold ( 1177): Ignoring unknown switch 'usb_mass_storage'

E/AndroidRuntime( 1184): Set to default setting_6 : region=-Duser.region=US propRegn=US

W/AudioHardwareALSA( 1185): Unable to attach mixer to device AndroidPlayback: Invalid argument

W/AudioHardwareALSA( 1185): Unable to attach mixer to device AndroidRecord: Invalid argument

E/ALSAStreamOps( 1185): ALSAStreamOps creator mOldOutputDevice=0,mOutputDevice=2,mOldInputDevice=0,mInputDevice=0

E/dalvikvm( 1268): ERROR: Can't byte swap: bad dex version (0x30 33 36 00)

E/dalvikvm( 1268): ERROR: Byte swap + verify failed

E/dalvikvm( 1268): Optimization failed

W/dalvikvm( 1184): DexOpt: --- END 'framework.jar' --- status=0xff00, process failed

E/dalvikvm( 1184): Unable to extract+optimize DEX from '/system/framework/framework.jar'

E/ALSAStreamOps( 1185): setParameter mOldOutputDevice=2,mOutputDevice=2,mOldInputDevice=0,mInputDevice=0 mCurrentNXPMode=0

W/VolumeCustomizer( 1185): [MID] =====> @@@ createVolumeTable device=0, locale=0

W/VolumeCustomizer( 1185): [MID] =====> @@@ createVolumeTable device=1, locale=0

W/VolumeCustomizer( 1185): [MID] =====> @@@ createVolumeTable device=4, locale=0

E/DataRouter( 1183): [*] Connect_RILD() done

E/DataRouter( 1183): [dr_smd_ril_init] dr_smd_ril_Connect successful

E/DataRouter( 1183): [dr_smd_ril_init] dr_smd_ril_Connect successful

E/DataRouter( 1183): [dr_smd_ril_init] successful

E/DataRouter( 1183): Data Routerdr_smd_ril_init Successfully done

E/DataRouter( 1183): Pipe Created

E/DataRouter( 1183): Pipe Created sucessfully

E/DataRouter( 1183): Pipe Created

E/DataRouter( 1183): Launching MassStorage Monitor Thread

E/DataRouter( 1183): Data Router: INIT-

E/DataRouter( 1183): __initialize_usb_ipc

E/DataRouter( 1183): Initialise USB and start the thread

E/DataRouter( 1183): +

E/DataRouter( 1183): USB Interface is open with 0x15

E/DataRouter( 1183): USB interface is now configured for usb_fd = 0x15

E/DataRouter( 1183): -

E/DataRouter( 1183): THREAD LAUNCH

E/DataRouter( 1183): +

E/DataRouter( 1183): +

E/DataRouter( 1183): USB monitor thread launched, usb_fd= 0x15

E/DataRouter( 1183): Before the while loop

E/DataRouter( 1183): Before the usb select

E/JNIHelp ( 1184): Native registration unable to find class 'android/debug/JNITest'

E/AndroidRuntime( 1184): Unable to register all android natives