[Galaxy Tab 2 7" Android Development] ketut.kumajaya:
I confirm this problem! And the trick: boot into recovery and then boot normal, USB connection will back!

You will get /proc/last_kmsg like this when boot normal directly after flash param.lfs with "cat param.lfs > /dev/block/mmcblk0p4" or "dd if=param.lfs of=/dev/block/mmcblk0p4 bs=4096"

SA_PH_CFG_VBATLOWV = 0x80
PHOENIX_LAST_TURNOFF_STS = 0x1
MSV already was fused : 0xf000ff00

Secondary Bootloader v3.1 version.
Copyright (C) 2011 System S/W Group. Samsung Electronics Co., Ltd.
Board: GT-P3100 REV 04-REAL / Jan 23 2013 22:06:28

booting code=0x0
===== PARTITION INFORMATION =====
ID : X-loader (0x1)
DEVICE : MMC
FIRST UNIT : 0
NO. UNITS : 0
=================================
ID : EFS (0x4)
DEVICE : MMC
FIRST UNIT : 8192
NO. UNITS : 40960
=================================
ID : SBL1 (0x2)
DEVICE : MMC
FIRST UNIT : 49152
NO. UNITS : 4096
=================================
ID : SBL2 (0x3)
DEVICE : MMC
FIRST UNIT : 53248
NO. UNITS : 4096
=================================
ID : PARAM (0x5)
DEVICE : MMC
FIRST UNIT : 57344
NO. UNITS : 16384
=================================
ID : KERNEL (0x6)
DEVICE : MMC
FIRST UNIT : 73728
NO. UNITS : 16384
=================================
ID : RECOVERY (0x7)
DEVICE : MMC
FIRST UNIT : 90112
NO. UNITS : 16384
=================================
ID : CACHE (0x8)
DEVICE : MMC
FIRST UNIT : 106496
NO. UNITS : 1433600
=================================
ID : MODEM (0x9)
DEVICE : MMC
FIRST UNIT : 1540096
NO. UNITS : 40960
=================================
ID : FACTORYFS (0xa)
DEVICE : MMC
FIRST UNIT : 1581056
NO. UNITS : 2867200
=================================
ID : DATAFS (0xb)
DEVICE : MMC
FIRST UNIT : 4448256
NO. UNITS : 25280478
=================================
ID : HIDDEN (0xd)
DEVICE : MMC
FIRST UNIT : 29728734
NO. UNITS : 1048576
=================================
ID : GANG (0x0)
DEVICE : MMC
FIRST UNIT : 0
NO. UNITS : 0
=================================
loke_init: j4fs_open..success
<start_checksum:310>CHECKSUM_HEADER_SECTOR :42
<start_checksum:313>offset:42, size:1024
Not Need Movinand Checksum
boot parameter file does not exist..
invalid magic and version 2...
save param.blk, size: 5268
save param.blk successfully.
make new boot parameter file..
switch_sel_str='ÿÿÿÿ'
switch_sel_int='0'
load_debug_level: read debug level successfully(0x574f4c44)...LOW
init_ddi_data: usable ddi data.
Set charging current USB
omap_max17042_read_temp: FG Temp raw_data : 0x2120
read_temp_adc:adc_data : 833
read_temp_adc:adc_data : 834
read_temp_adc:adc_data : 832
read_temp_adc:adc_data : 831
read_temp_adc:adc_data : 823
check_battery_type: fg temp : 33124, adc_temp : 390
check_battery_type: Set BATTERY_TYPE_SDI
omap_max17042_set_model_data : Already fuel gauge initialized !!
max17042_compensate_soc: vcell(3861), rep_soc(58)
calculate_table_soc: charging status : 2, vcell(3861), table_soc(56)
[SBL] VFOCV MSB : 0xc0, LSB : 0xe5
[SBL_CHARGER] SOC : 58, VCELL : 3861, VFSOC : 44, VFOCV : 3857
save param.blk, size: 5268
save param.blk successfully.
save switch_sel(0)...ok
reading nps status file is successfully!.
nps status=0x504d4f43
g_nRebootReason = 0x1
set_lcd_panel_id: panel_adc=144
*** ltn070nl01_power_on ***
lcd_pannel_id=2

Autoboot (1 seconds) in progress, press any key to stop .

boot_kernel: debug level low!
checkbit: find RECOVERY
checkbit (15c8ea37)
Kernel @ 81808000 (0x4083a4 bytes)
Ramdisk @ 82800000 (0x97ed9 bytes)
[WARNING] Current kernel is NOT official binary!!!

Starting kernel at 0x81808000...

I also need to confirm the attached boot logo at post #1 not compatible to the current JB bootloader, different file mapping. Attached the compatible one, XDA version :cool: