Ok I'm going to make a detailed guide of how this worked for me because succeed depends a lot on which firmware you have in your tab. It's a good idea to start with JM6 since you can flash it completely if you have an older firmware or JMA (I guess you won't be able to flash it in the future if a new firmware is released). You won't lose your internal SD Card data but your phone will be factory reset.
1) Download JM6 from here
You'll get Odin 1.7 + PIT + PHONE + PDA + CSC.
2) Download JMA from here: here
3) Download JMC from here: here
4) Start Odin 1.7 and select:
*PIT P1_SMD_MAP.pit
*REPARTITION YES
*AUTO REBOOT YES
*F. RESET TIME YES
*PDA: CODE_P1000XXJM6.tar.md5
*PHONE: MODEM_P1000XXJM6.tar.md5
*CSC: CSC_P1000OXAJM6.tar.md5
5) Put your TAB in download mode: Turn it off, press POWER + VOL DOWN
6) Press start in ODIN and wait until process is completed. Your tab will REBOOT in download mode.
7) Now press POWER + VOL UP and when you see SAMSUNG logo RELEASE POWER BUT KEEP PRESSING VOL UP in order to enter recovery and let the TAB flash dbdata, it'll reboot and boot into android. (unplug your USB cable because Odin won't recognize it on some systems)
8) Open Odin 1.7 again or press RESET and select:
*PIT: NONE
*REPARTITION NO
*AUTO REBOOT YES
*F. RESET TIME YES
*PDA: JMA.tar (from JMA file obviously)
*PHONE: NONE
*CSC: NONE
9) Repeat 5), 6) and 7)
10) Open Odin 1.7 again or press RESET and select:
*PIT: NONE
*REPARTITION NO
*AUTO REBOOT YES
*F. RESET TIME YES
*PDA: P1000XXJMC_P1000OXAJMC_P1000XXJMA_HOME.tar (from JMC file obviously)
*PHONE: NONE
*CSC: NONE
11) Repeat 5), 6) and 7)
I have an AT&T TAB and this process worked for me.
If you need 850 + 1900 you only have to flash MODEM (PHONE button in ODIN) from HERE (modem_bell_i9000.zip) with No PIT, no repartition, no PDA and no CSC.
I hope this helps anybody and sorry about my english
EDIT: If for some strage reason you get the !!! --- !!! screen in your tab, don't panic. You can start the whole process again, Odin will detect your phone, it's a download mode anyway.
EDIT2: I always choose to wipe all my data. I use Titanium backup and I can get most of my data back from there. It's better to have a functional tab than a brick full of useless data. Wiping will always be safer.
EDIT3: Made some modifications to step 7. What you need to do is to enter recovery and that's it. It wasn't clear. Now I think you'll get it right. I didn't test it without step 7 but some people seems to be doing well without doing step 7. Maybe device is entering recovery automatically and flashing dbdata on its own (this is to be expected but sometimes it just doesn't happen).
Copy from : http://forum.xda-developers.com/showthread.php?p=10026248#post10026248
