One guide i found..but its a bit weird like remove battery section??
Tutorial We will try to give you the right steps to Update its Firmware.
Tools: Samsung P1000 Download Program - USB cable.
Samsung P1000 Galaxy Tab USB Drivers
Firmware Update Steps:
Run Samsung P1000 Download program.
Check these Three Options: Re-Partition + Auto Reboot + F.Reset Time.
Select PIT file in its field.
Put Device Into Download Mode ( Press Volume Down + Power ).
Connect Cable To Phone.
Make sure ID:COM box highlighted yellow that the device is connected to the PC.
Start Downloading PIT file by clicking Start Button. Then wait for "Pass" to be appear on the screen.
Click on Reset button, then unselect Re-Partition box. Then select PDA, PHONE and CSC Files each in his field.
Remove the battery, then enter Device into Download Mode again, then connect to the PC.
Start Downloading PDA, PHONE and CSC files by clicking Start Button. Then wait for "Pass" to be appear on the screen.
After all is done reboot the phone and Do Full Reset: *2767*3855#.
Also a video in german on youtube - just search for :
sorry you´ll have to find it yourself, im to fresh to post links in forum..