[Android Q&A, Help & Troubleshooting] JuhaniJ:
I tried to boot my phone with an almost empty battery several times. Apparently something got corrupted, because now the boot process hangs at the phone vendor logo. Adb and fastboot and boot to recovery (TWRP) work.

Command adb logcat *:E shows the following errors. There are errors from both the sdcard0 and sdcard1. Then comes an error "Unable to find android system package". How can I fix these using fastboot or adb or TWRP? I wouldn't like to reflash and wipe everything.

The phone is Jiayu S3 (16GB model) with TWRP 2.8.7.0 and Android 5.1.1 (German version).

--------- beginning of system
E/VoldCmdListener( 276): Unable to sendBroadcast message. code=605, message='Volume sdcard0 /storage/sdcard0 state changed from -1 (Initializing) to 0 (No-Media) 0'(Not a typewriter)
E/VoldCmdListener( 276): Unable to sendBroadcast message. code=605, message='Volume sdcard0 /storage/sdcard0 state changed from 0 (No-Media) to 1 (Idle-Unmounted) 0'(Not a typewriter)
E/VoldCmdListener( 276): Unable to sendBroadcast message. code=605, message='Volume sdcard1 /storage/sdcard1 state changed from -1 (Initializing) to 0 (No-Media) 0'(Not a typewriter)
E/VoldCmdListener( 276): Unable to sendBroadcast message. code=605, message='Volume usbotg /storage/usbotg state changed from -1 (Initializing) to 0 (No-Media) 0'(Not a typewriter)
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/VoldCmdListener( 276): Unable to sendBroadcast message. code=605, message='Volume sdcard0 /storage/sdcard0 state changed from 1 (Idle-Unmounted) to 2 (Pending) 0'(No such device)
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/DirectVolume( 276): 'sdcard0' is pluged in.!!
E/VoldCmdListener( 276): Unable to sendBroadcast message. code=605, message='Volume sdcard0 /storage/sdcard0 state changed from 2 (Pending) to 1 (Idle-Unmounted) 0'(No such device)
E/VoldCmdListener( 276): Unable to sendBroadcast message. code=630, message='Volume sdcard0 /storage/sdcard0 disk inserted (179:0)'(No such device)
E/DirectVolume( 276): 'sdcard1' is pluged in.!!
E/VoldCmdListener( 276): Unable to sendBroadcast message. code=605, message='Volume sdcard1 /storage/sdcard1 state changed from 0 (No-Media) to 2 (Pending) 0'(No such device)
E/DirectVolume( 276): 'sdcard1' is pluged in.!!
E/VoldCmdListener( 276): Unable to sendBroadcast message. code=605, message='Volume sdcard1 /storage/sdcard1 state changed from 2 (Pending) to 1 (Idle-Unmounted) 0'(No such device)
E/VoldCmdListener( 276): Unable to sendBroadcast message. code=630, message='Volume sdcard1 /storage/sdcard1 disk inserted (179:128)'(No such device)
E/VoldCmdListener( 276): Unable to sendBroadcast message. code=605, message='Volume sdcard0 /storage/sdcard0 state changed from 1 (Idle-Unmounted) to 4 (Mounted) 0'(No such file or directory)
E/BootLogoUpdater( 278): [boot_logo_updater]boot_mode = 0
E/BootLogoUpdater( 278): [boot_logo_updater]boot package = 1
E/BootLogoUpdater( 278): [boot_logo_updater]update boot reason = 0, ret = 0
E/System ( 835): ******************************************
E/System ( 835): ************ Failure starting system services
E/System ( 835): java.lang.RuntimeException: Unable to find android system package
E/System ( 835): at com.android.server.am.ActivityManagerService.setSystemProcess(ActivityManagerService.java:2069)
E/System ( 835): at com.android.server.SystemServer.startBootstrapServices(SystemServer.java:500)
E/System ( 835): at com.android.server.SystemServer.run(SystemServer.java:338)
E/System ( 835): at com.android.server.SystemServer.main(SystemServer.java:241)
E/System ( 835): at java.lang.reflect.Method.invoke(Native Method)
E/System ( 835): at java.lang.reflect.Method.invoke(Method.java:372)
E/System ( 835): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)
E/System ( 835): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)
E/System ( 835): Caused by: android.content.pm.PackageManager$NameNotFoundException: android
E/System ( 835): at android.app.ApplicationPackageManager.getApplicationInfo(ApplicationPackageManager.java:286)