[Nexus 7 Original Development] J_Caselles:
Sure, I've already played for a while with MultiROM, I've multiROMed several android ROMS, Ubuntu, bodhi... I have stock 4.2.2 kexec kernel posted in OP. And yes, I did make sure to set don't share both times I tried flashing... right now I've flashed the first recovery (20130221), and I'm waiting for the big data file to finish flashing (haven't find any problem with this recovery). I'll tell you when finish.

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No luck with first recovery either. here is my #./adb logcat output:

--------- beginning of /dev/alog/main
I/installd( 129): installd firing up
I/DEBUG ( 125): debuggerd: Feb 21 2013 05:01:15
I/cm ( 158): ____ _ _ ____ _ _ ____ ____ ____ _ _ _ _ ____ ___
I/cm ( 159): | \_/ |__| |\ | | | | __ |___ |\ | |\/| | | | \
I/cm ( 163): |___ | | | | \| |__| |__] |___ | \| | | |__| |__/
I/cm ( 169): Welcome to Android 4.2.1 / CyanogenMod-10.1-20130221-UNOFFICIAL-grouper
E/btMacWriter( 133): Cannot open source file.
E/btMacWriter( 133): Failed to copy bt adress from partition
I/Sensor Daemon( 134): Service started
I/Sensor Daemon( 134): No new compass calibration ini
I/Sensor Daemon( 134): No new accel calibration ini
D/gpsd ( 142): main()
D/gpsd ( 142): argv[0] = '/system/bin/glgps'
D/gpsd ( 142): argv[1] = '-c'
D/gpsd ( 142): argv[2] = '/system/etc/gps/gpsconfig.xml'
I/SurfaceFlinger( 126): SurfaceFlinger is starting
I/SurfaceFlinger( 126): SurfaceFlinger's main thread ready to run. Initializing graphics H/W...
D/libEGL ( 126): loaded /system/lib/egl/libEGL_tegra.so
I/Sensor Daemon( 134): copy accelerometer config file success
I/ServiceManager( 131): Waiting for service SurfaceFlinger...
I/Sensor Daemon( 134): copy magnetic config file success
D/libEGL ( 126): loaded /system/lib/egl/libGLESv1_CM_tegra.so
I/mediaserver( 128): ServiceManager: 0x40bdce88
I/AudioFlinger( 128): Using default 3000 mSec as standby time.
I/CameraService( 128): CameraService started (pid=128)
D/libEGL ( 126): loaded /system/lib/egl/libGLESv2_tegra.so
I/Sensor Daemon( 134): copy light sensor config file success
E/gralloc ( 126): creating nvcap video capture service
E/gralloc ( 126): failed to load libnvcap_video.so (Cannot load library: load_library(linker.cpp:747): library "/system/lib/libnvcap_video.so" not found)
E/gralloc ( 126): Failed to create overlay for display 2
E/gralloc ( 126): Failed to create overlay for display 2
E/gralloc ( 126): Failed to create overlay for display 2
I/gralloc ( 126): using (fd=16)
I/gralloc ( 126): id = tegra_fb
I/gralloc ( 126): xres = 800 px
I/gralloc ( 126): yres = 1280 px
I/gralloc ( 126): xres_virtual = 800 px
I/gralloc ( 126): yres_virtual = 2560 px
I/gralloc ( 126): bpp = 32
I/gralloc ( 126): r = 0:8
I/gralloc ( 126): g = 8:8
I/gralloc ( 126): b = 16:8
I/gralloc ( 126): smem_start = 0xbec00000
I/gralloc ( 126): smem_len = 0x00900000
I/gralloc ( 126): format = 1
I/gralloc ( 126): stride = 800
I/gralloc ( 126): width = 104 mm (195.384613 dpi)
I/gralloc ( 126): height = 162 mm (200.691360 dpi)
I/gralloc ( 126): refresh rate = 60.00 Hz
I/SurfaceFlinger( 126): Using composer version 1.0
W/SurfaceFlinger( 126): getting VSYNC period from fb HAL: 16667235
W/SurfaceFlinger( 126): no suitable EGLConfig found, trying without EGL_FRAMEBUFFER_TARGET_ANDROID
I/Sensor Daemon( 134): Service: sensors-config load Success
I/Sensor Daemon( 134): chown sensors
I/AudioPolicyManagerBase( 128): loadAudioPolicyConfig() loaded /system/etc/audio_policy.conf
I/SurfaceFlinger( 126): EGL informations:
I/SurfaceFlinger( 126): vendor : Android
I/SurfaceFlinger( 126): version : 1.4 Android META-EGL
I/SurfaceFlinger( 126): extensions: EGL_KHR_image EGL_KHR_image_base EGL_KHR_image_pixmap EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_gl_renderbuffer_image EGL_KHR_fence_sync EGL_EXT_create_context_robustness EGL_NV_system_time EGL_ANDROID_image_native_buffer
I/SurfaceFlinger( 126): Client API: OpenGL_ES
I/SurfaceFlinger( 126): EGLSurface: 8-8-8-8, config=0xcaf32c
I/SurfaceFlinger( 126): OpenGL ES informations:
I/SurfaceFlinger( 126): vendor : NVIDIA Corporation
I/SurfaceFlinger( 126): renderer : NVIDIA AP
I/SurfaceFlinger( 126): version : OpenGL ES-CM 1.1
I/SurfaceFlinger( 126): extensions: GL_EXT_bgra GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_s3tc GL_EXT_texture_format_BGRA8888 GL_EXT_unpack_subimage GL_EXT_debug_marker GL_EXT_debug_label GL_NV_texture_npot_2D_mipmap GL_OES_byte_coordinates GL_OES_compressed_ETC1_RGB8_texture GL_OES_compressed_paletted_texture GL_OES_draw_texture GL_OES_extended_matrix_palette GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_EGL_sync GL_OES_fbo_render_mipmap GL_OES_fixed_point GL_OES_framebuffer_object GL_OES_matrix_get GL_OES_matrix_palette GL_OES_point_size_array GL_OES_point_sprite GL_OES_query_matrix GL_OES_read_format GL_OES_rgb8_rgba8 GL_OES_single_precision GL_OES_stencil8 GL_OES_texture_cube_map GL_OES_vertex_half_float
I/SurfaceFlinger( 126): GL_MAX_TEXTURE_SIZE = 2048
I/SurfaceFlinger( 126): GL_MAX_VIEWPORT_DIMS = 3839 x 3839
D/SurfaceFlinger( 126): Screen acquired, type=0 flinger=0x40d32318
I/Sensor Daemon( 134): change owner and mode: accel calibration file
I/hwcomposer( 126): Setting interactive mode: On
I/AudioFlinger( 128): loadHwModule() Loaded primary audio interface from Grouper audio HW HAL (audio) handle 1
I/AudioFlinger( 128): HAL output buffer size 512 frames, normal mix buffer size 1024 frames
I/AudioMixer( 128): found effect "Multichannel Downmix To Stereo" from The Android Open Source Project
E/MonoPipe( 128): Failed to fetch local time frequency when constructing a MonoPipe (res = -32). getNextWriteTimestamp calls will be non-functional
W/AudioFlinger( 128): Policy SCHED_FIFO priority 3 is unavailable for pid 128 tid 226; error -1
I/AudioFlinger( 128): Using module 1 has the primary audio interface
I/Sensor Daemon( 134): change owner and mode: compass calibration file
I/AudioFlinger( 128): AudioFlinger's thread 0x400bd008 ready to run
W/AudioFlinger( 128): Thread AudioOut_2 cannot connect to the power manager service
E/AudioFlinger( 128): int android::load_audio_interface(const char*, audio_hw_device_t**) couldn't load audio hw module audio.a2dp (No such file or directory)
I/AudioFlinger( 128): loadHwModule() error -2 loading module a2dp
W/AudioPolicyManagerBase( 128): could not open HW module a2dp
I/AudioFlinger( 128): loadHwModule() Loaded usb audio interface from USB audio HW HAL (audio) handle 3
I/AudioPolicyService( 128): Loaded audio policy from LEGACY Audio Policy HAL (audio_policy)
I/Sensor Daemon( 134): chown light sensor folder
I/Sensor Daemon( 134): change owner and mode: light sensor calibration file
I/mir::ApplicationManager( 131): virtual bool android::InputSetup::DummyApplication::updateInfo()
I/mir::ApplicationManager( 131): virtual bool android::InputSetup::DummyApplicationWindow::updateInfo()
D/EventHub( 131): No input device configuration file found for device 'lid_input'.
I/EventHub( 131): New device: id=1, fd=34, path='/dev/input/event1', name='lid_input', classes=0x80, configuration='', keyLayout='', keyCharacterMap='', builtinKeyboard=false, usingSuspendBlockIoctl=true, usingClockIoctl=false
I/EventHub( 131): New device: id=2, fd=35, path='/dev/input/event0', name='elan-touchscreen', classes=0x14, configuration='/system/usr/idc/elan-touchscreen.idc', keyLayout='', keyCharacterMap='', builtinKeyboard=false, usingSuspendBlockIoctl=true, usingClockIoctl=false
D/EventHub( 131): No input device configuration file found for device 'gpio-keys'.
I/EventHub( 131): New device: id=3, fd=36, path='/dev/input/event2', name='gpio-keys', classes=0x1, configuration='', keyLayout='/system/usr/keylayout/gpio-keys.kl', keyCharacterMap='/system/usr/keychars/Generic.kcm', builtinKeyboard=false, usingSuspendBlockIoctl=true, usingClockIoctl=false
I/InputReader( 131): Device added: id=-1, name='Virtual', sources=0x00000301
I/InputReader( 131): Device added: id=3, name='gpio-keys', sources=0x00000101
I/InputReader( 131): Device reconfigured: id=2, name='elan-touchscreen', size 800x1280, orientation 0, mode 1, display id 0
I/InputReader( 131): Device added: id=2, name='elan-touchscreen', sources=0x00001002
I/InputReader( 131): Device added: id=1, name='lid_input', sources=0x80000000
D/SensorService( 130): nuSensorService starting...
E/MPL-storeload( 130): Cannot open file "/data/inv_cal_data.bin" for read
E/MPL-storeload( 130): Could not load cal file - aborting
E/MPL-storeload( 130): Could not load the calibration data - error 107 - aborting
I/Sensors ( 130): accel config: (977, -1169); (1118, -879); (1513, -1315);
I/Sensors ( 130): HAL:Set accel bias through inv_set_accel_bias() by AccelLoadConfig().
I/SensorService( 130): MPL Gyroscope
I/SensorService( 130): MPL Accelerometer
I/SensorService( 130): MPL Magnetic Field
I/SensorService( 130): MPL Orientation
I/SensorService( 130): MPL Rotation Vector
I/SensorService( 130): MPL Linear Acceleration
I/SensorService( 130): MPL Gravity
I/SensorService( 130): Lite-On al3010 Ambient Light Sensor
D/SensorService( 130): nuSensorService thread starting...

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When comparing this output with the internal ROM (stock 4.2.2) logcat, I realise one line at the begining: "flashing new recovery.....", I realized I hadn't boot the internal (any ROM, actually) after flashing the 20130221 recovery. I've rebooted the internal ROM, and the line is no longer shown. Does the recovery get finally flashed when booting internal? or what does thit mean?