[Xperia Play Android Development] Mills00013:
No luck on the r800x build. I had to remove the assert out of the update.zip file to get it to flash, and now I'm back to the unrecoverable errors with the phone:

I/Process ( 686): Sending signal. PID: 686 SIG: 9
I/ServiceManager( 134): service 'phone' died
I/ServiceManager( 134): service 'isms' died
I/ServiceManager( 134): service 'simphonebook' died
I/ServiceManager( 134): service 'iphonesubinfo' died
I/ServiceManager( 134): service 'sip' died
W/InputManagerService( 211): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@2b0e5418
I/ActivityManager( 211): Process com.android.phone (pid 686) has died.
I/ActivityManager( 211): Start proc com.android.phone for restart com.android.phone: pid=714 uid=1001 gids={3002, 3001, 3003, 1015}
W/ActivityManager( 211): Failure sending broadcast Intent { act=android.intent.action.SCREEN_ON flg=0x40000000 }
W/ActivityManager( 211): android.os.DeadObjectException
W/ActivityManager( 211):	at android.os.BinderProxy.transact(Native Method)
W/ActivityManager( 211):	at android.content.IIntentReceiver$Stub$Proxy.performReceive(IIntentReceiver.java:121)
W/ActivityManager( 211):	at com.android.server.am.ActivityManagerService.performReceiveLocked(ActivityManagerService.java:10853)
W/ActivityManager( 211):	at com.android.server.am.ActivityManagerService.deliverToRegisteredReceiverLocked(ActivityManagerService.java:10915)
W/ActivityManager( 211):	at com.android.server.am.ActivityManagerService.processNextBroadcast(ActivityManagerService.java:11121)
W/ActivityManager( 211):	at com.android.server.am.ActivityManagerService.access$100(ActivityManagerService.java:147)
W/ActivityManager( 211):	at com.android.server.am.ActivityManagerService$2.handleMessage(ActivityManagerService.java:1109)
W/ActivityManager( 211):	at android.os.Handler.dispatchMessage(Handler.java:99)
W/ActivityManager( 211):	at android.os.Looper.loop(Looper.java:130)
W/ActivityManager( 211):	at com.android.server.am.ActivityManagerService$AThread.run(ActivityManagerService.java:1364)
D/szipinf ( 714): Initializing inflate state
I/ActivityThread( 714): Pub mms: com.android.providers.telephony.MmsProvider
I/ActivityThread( 714): Pub sms: com.android.providers.telephony.SmsProvider
I/ActivityThread( 714): Pub telephony: com.android.providers.telephony.TelephonyProvider
I/ActivityThread( 714): Pub icc: com.android.phone.IccProvider
I/ActivityThread( 714): Pub mms-sms: com.android.providers.telephony.MmsSmsProvider
D/CallManager( 714): registerPhone(GSM Handler{2aff5410})
V/AudioPolicyManager( 140): getDeviceForStrategy() from cache strategy 1, device 1
W/ActivityManager( 211): Unable to start service Intent { act=com.android.ussd.IExtendedNetworkService }: not found
D/dalvikvm( 714): GC_CONCURRENT freed 195K, 48% free 2988K/5639K, external 0K/0K, paused 2ms+3ms
I/TelephonyRegistry( 211): notifyServiceState: 1 home null null null Unknown CSS not supported -1 -1RoamInd: -1DefRoamInd: -1EmergOnly: false
I/TelephonyRegistry( 211): notifyDataConnection: state=0 isDataConnectivityPossible=false reason=radioTurnedOff interfaceName=null networkType=0
I/TelephonyRegistry( 211): notifyDataConnection: state=0 isDataConnectivityPossible=false reason=gprsDetached interfaceName=null networkType=0
D/BT HSHFP( 714): Starting BluetoothHeadsetService
D/PhoneApp( 714): Radio technology switched. Now CDMA is active.
V/SipBroadcastReceiver( 714): start auto registration
I/TelephonyRegistry( 211): notifyServiceState: 3 home null null null Unknown CSS not supported -1 -1RoamInd: -1DefRoamInd: -1EmergOnly: false
I/TelephonyRegistry( 211): notifyDataConnection: state=0 isDataConnectivityPossible=false reason=radioTurnedOff interfaceName=null networkType=0
I/TelephonyRegistry( 211): notifyMessageWaitingChanged: false
D/PhoneApp( 714): Radio technology switched. Now CDMA is active.
D/AndroidRuntime( 714): Shutting down VM
W/dalvikvm( 714): threadid=1: thread exiting with uncaught exception (group=0x2aac0560)
E/AndroidRuntime( 714): FATAL EXCEPTION: main
E/AndroidRuntime( 714): java.lang.NullPointerException
E/AndroidRuntime( 714):	at com.android.internal.telephony.gsm.GSMPhone.getState(GSMPhone.java:262)
E/AndroidRuntime( 714):	at com.android.internal.telephony.CallManager.getState(CallManager.java:243)
E/AndroidRuntime( 714):	at com.android.phone.PhoneUtils$ConnectionHandler.handleMessage(PhoneUtils.java:187)
E/AndroidRuntime( 714):	at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 714):	at android.os.Looper.loop(Looper.java:130)
E/AndroidRuntime( 714):	at android.app.ActivityThread.main(ActivityThread.java:3835)
E/AndroidRuntime( 714):	at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 714):	at java.lang.reflect.Method.invoke(Method.java:507)
E/AndroidRuntime( 714):	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
E/AndroidRuntime( 714):	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
E/AndroidRuntime( 714):	at dalvik.system.NativeStart.main(Native Method)
W/ActivityManager( 211): Process com.android.phone has crashed too many times: killing!

Edit: Just for clarification, I got it to flash just fine. The kernel works just fine. Its just the same errors with the phone app crashing too often to do anything usable on the device.