How can I upgrade my phone GT-P1000 to another network to catch 3g. Samsung tablet

You need to do hard reset:
Samsung Galaxy Tab GT P1000 hard reset
Samsung Galaxy Tab GT P1000 hard reset

HI if your samsung Galaxy Tab P1000 mobile displays sim network unlock pin .Then it mean your phone is locked to any particular network provider due to this you can't use your phone with other network sim ..To fix this you have to unlock your phone from network provider lock ..You can easily unlock your phone using sites like Mobile-Unlocker.com here they render unlock code for all mobile models at reliable cost ...

Press and hold the power and volume +/- buttons.

The Network Unlock Code of each Galaxy Tab is unique.You can get the network unlock code of your Samsung Galaxy Tab Gt-p1000 from Onlinegsmunlock.com .There you have to give your Country and current network name along with your IMEI number to get network unlock code.They will give you network unlock code along with instruction on how to unlock.Follow the instruction correctly to unlock your Samsung Galaxy Tab Gt-p1000.

To unlock Samsung P1000 Galaxy Tab, Visit Unlock-zone.com for which you have to provide country and the network it is currently locked and also IMEI number. After that get the code and unlock it.

This is the Samsung Galaxy Tab GT-P1000 Official User Manual available for download. (PDF format, 2.8 MB, 82 pages). See also: Samsung Galaxy Tab P1000 ... store.clintongoveas.com/99-samsung-galaxy-tab-gt-p1000-official-user-manual.html store.clintongoveas.com/99-samsung-galaxy-tab-gt-p1000-official-user-manual.html
went in and checked this site out - hope it helps you

Hi,

Good day. I''m afraid you might have accidentally got the Operating System of your Samsung Tab corrupted. Im referring to your firmware. Usually if the firmware upgrade failed you need to retry it until it be successful. If you restart it or discontinue the process it will cause your Samsung Tab to be corrupted resulting into failure of the boot up process. You might need to contact samsung tech support for this or bring your equipment to the nearest center. They might need to check the software install and usually their software specialist will fix it for you. Sorry for what happen with your tab but i know the samsung repair center can fix it for you. Hope this information will be helpful to you. Have a great day.

Install these drivers http://firon.net/xda/Samsung_Mobile_Driver_V1.3.800_For_SPH-d700_Epic_4G.zip for windows 32bit 
this should fix your problem

YOU CAN GET UN OFFICIAL MOD I.E FOR ANDROID 2.3 ON YOUR GALAXY TAB.
ANDROID 3.0 IS AN DIFFERENT O/S ALTOGETHER AS IT REQUIRES DUAL CORE PROCESSORS.
TRY IN FOR SAMSUNG TAB 10.1

Hope this helps:

How to Hard Reset Samsung GT-P1000 Galaxy TAB:
If your Samsung GT-P1000 Galaxy TAB is frozen and unresponsive, press and hold [POWER ] for 8-10 seconds. The device will reboot automatically.
If this does not solve the problem, perform a factory data reset. In Menu
mode, select Settings ? Privacy ? Factory data reset ? Reset phone ? Erase everything.




Hard Reset Samsung GT-P1000 Galaxy TAB with keys With the Samsung Galaxy TAB turned off, press and hold the VOLUME DOWN button, and then briefly press the POWER button.