Hi, because im french and im a good guy, ill tell you how to restore the imei 0000000000 problem for free:
READ EVERYTHING BEFORE START, AND IM NOT RESPONSIBLE FOR ANY BRICK OR ELSE!
download this: (it's a pack)
-You must have a rooted phone
-In your phone, download es explorer or an other one and select superuser mode and allow write
-Erase with es explorer (or an other one) the nv_data.bin data in the "efs" folder on the root of your phone
-now, displug your battery and replug
-Put your phone into download mode
-on your computer, dezip the file i've made you download
-start odin (inside too), it recognize your phone on com port once you plug it
-select one package and dont touch to the others
-select OPS: spica_jc3.ops
-selet integrate package: I570EXXJH6.tar (in firmware)
Your phone will now be the 2.1 official from samsung and your imei phone is now restored!
Just flash it again to the cracked version you used to have and it's good!
If you like it, and want to pay my french breads: