[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] mihahn:
Thank you very much for your help, but it's not working :(

Here's the logcat:

I/sysproc ( 714): System server: starting Android runtime.
I/sysproc ( 714): System server: starting Android services.
I/SystemServer( 714): Entered the Android system server!
I/sysproc ( 714): System server: entering thread pool.
D/SensorService( 714): nuSensorService thread starting...
I/SystemServer( 714): Entropy Mixer
I/SystemServer( 714): Power Manager
I/SystemServer( 714): Activity Manager
I/ActivityManager( 714): Memory class: 48
W/UsageStats( 714): Usage stats version changed; dropping
I/ActivityManager( 714): Enabled StrictMode logging for AThread's Looper
I/SystemServer( 714): Telephony Registry
I/SystemServer( 714): Scheduling Policy
I/SystemServer( 714): Package Manager
W/PackageManager( 714): Library not found: /system/framework/com.sonyericsson.privateapis_impl.jar
I/PackageManager( 714): /system/framework/framework-res.apk changed; collecting certs
D/dalvikvm( 714): GC_CONCURRENT freed 3199K, 49% free 4422K/8519K, paused 4ms+3ms, total 90ms
D/dalvikvm( 714): GC_CONCURRENT freed 879K, 37% free 5385K/8519K, paused 4ms+2ms, total 56ms
D/dalvikvm( 714): WAIT_FOR_CONCURRENT_GC blocked 35ms
W/PackageParser( 714): Exception reading AndroidManifest.xml in /system/framework/framework-res.apk
W/PackageParser( 714): java.lang.SecurityException: META-INF/MANIFEST.MF has invalid digest for AndroidManifest.xml in /system/framework/framework-res.apk
W/PackageParser( 714):	at java.util.jar.JarVerifier.invalidDigest(JarVerifier.java:131)
W/PackageParser( 714):	at java.util.jar.JarVerifier.access$100(JarVerifier.java:53)
W/PackageParser( 714):	at java.util.jar.JarVerifier$VerifierEntry.verify(JarVerifier.java:123)
W/PackageParser( 714):	at java.util.jar.JarFile$JarFileInputStream.read(JarFile.java:119)
W/PackageParser( 714):	at java.io.BufferedInputStream.read(BufferedInputStream.java:304)
W/PackageParser( 714):	at android.content.pm.PackageParser.loadCertificates(PackageParser.java:463)
W/PackageParser( 714):	at android.content.pm.PackageParser.collectCertificates(PackageParser.java:612)
W/PackageParser( 714):	at com.android.server.pm.PackageManagerService.collectCertificatesLI(PackageManagerService.java:3102)
W/PackageParser( 714):	at com.android.server.pm.PackageManagerService.scanPackageLI(PackageManagerService.java:3197)
W/PackageParser( 714):	at com.android.server.pm.PackageManagerService.scanDirLI(PackageManagerService.java:3046)
W/PackageParser( 714):	at com.android.server.pm.PackageManagerService.<init>(PackageManagerService.java:1064)
W/PackageParser( 714):	at com.android.server.pm.PackageManagerService.main(PackageManagerService.java:851)
W/PackageParser( 714):	at com.android.server.ServerThread.run(SystemServer.java:199)
E/PackageParser( 714): Package android has no certificates at entry AndroidManifest.xml; ignoring!
W/PackageManager( 714): Failed verifying certificates for package:android
D/dalvikvm( 714): GC_CONCURRENT freed 1252K, 31% free 5914K/8519K, paused 3ms+41ms, total 97ms
W/PackageManager( 714): Permission com.google.android.talk.permission.VIDEO_CHAT_SERVICE from package com.google.android.talk ignored: no group null
D/StrictMode( 714): No activity manager; failed to Dropbox violation.
W/PackageManager( 714): Permission com.android.vending.CHECK_LICENSE from package com.android.vending ignored: no group null
W/PackageManager( 714): Permission com.android.vending.BILLING from package com.android.vending ignored: no group null

I'm pretty sure we will get that working, thanks for your support! ;)