Help with rooting Galaxy Tab SCH-i800

Sorry to hear you've been having so much trouble. Sounds like a rough game.

You mentioned you were planning to upgrade to 4.0 or beyond. Did you do that before or after trying to achieve root? That's a critical issue--I can't imagine any developer is still working on root for a <4.0 device anymore, and it could very well be that your root protocol required a more upgraded version of Android than what you were running.

Assuming that wasn't the problem ... you might or might not be in big trouble. I'm leaning toward might, sadly. Trouble is it sounds like you've soft-bricked your Galaxy Tab, or at least done something serious to the underlying firmware. I haven't owned one of these earlier Tabs, mind you, but my experience with Samsung devices (and rooting in general) is that you follow directions to the letter or else. I've broken that rule before, and I have soft-bricked two phones in the process (managed to unbrick both, phew!)

I'd need to know if you upgraded to the latest manufacturer version of Android available for your Tab before I could provide you with any real help. One thing I'd ask is, you're on a pretty old device--why not consider a Tab 2 that already runs the latest version of Android? I understand if you don't want to shell out the cash (though it is cheaper than an iPad) but at this point that's probably your easiest solution.

Well, i've been looking all the way down to your problem and what i'd figure out for you is these steps feel free to use it and let me know if you need any help:

Pre Requisites:
1. Backup your device data. You can follow our ultimate backup guide.
2. Make sure your device have at least 60% battery power. You can install an app like Battery Notifier BT Free on your Android device to check it easily.
3. You already have USB Driver Installed for Verizon Galaxy Tab 7 SCH-I800 in your PC. [Download USB Drivers]
4. Make sure USB Debugging is enabled otherwise you won’t able to transfer file between PC and Verizon Galaxy Tab 7 SCH-I800. [Guide].
5. Your device have ClockworkMod Recovery Installed. [Guide]
6. Your device is rooted already.
If you done everything that we mentioned above then you are ready to follow step-by-step guide on how to install Android 4.1.2 Jelly Bean based CM10 ROM on Verizon Galaxy Tab 7 SCH-I800.

File Required(Download by clicking on it)

CM10 Android 4.1.2 Jelly Bean ROM For Verizon Galaxy Tab 7 SCH-I800 [Filename: cm-10-20131006-NIGHTLY-p1c.zip]
Google Apps [Filename: gapps-jb-20121011-signed.zip]
How to Install Android 4.1.2 Jelly Bean based CM10 ROM on Verizon Galaxy Tab 7 SCH-I800
Connect your device to PC using USB cable and then copy downloaded files to the SD card of your device. Important: Don’t extract any files.
Disconnect USB and then turn off your Verizon Galaxy Tab 7 SCH-I800.
Now, boot into recovery mode. To do so, press and hold Volume Up and Power button together until Samsung logo flash twice and then leave the button. You should see recovery menu soon. In recovery use Volume Keys to navigate between option and Power to select an option. Alternatively try this: Recovery Mode without Key Combination.
Perform a Nandroid backup of your existing ROM that you can restore later if this new ROM not work or you want to go back into your previous ROM. To perform a backup, select Backup and Restore, then on the next screen, select Backup again. Go back to main recovery menu after backup is complete.
Now, perform data wiping task. To do so, select wipe data/factory reset, then select Yes on next screen to confirm your action. Wait few minutes till the data wipe is complete. Now come back to CWM recovery main menu. Select wipe cache partition and after wiping process done, select Wipe Dalvik Cache under advance option to perform Dalvik cache wiping.
Select install zip from sdcard, then select choose zip from sdcard. Now, locate the cm-10-20131006-NIGHTLY-p1c.zip file that you copied earlier in Step 1 and select it by pressing Power button. Confirm installation by selecting Yes – Install _____.zip on the next screen. The ROM installation will begin.
Once the ROM installation process end, repeat the step 6 but choose the gapps-jb-20121011-signed.zip file instead of ROM zip to install the Google apps package.
When installation is completed, go back to the main recovery menu and select reboot system now to reboot your Verizon Galaxy Tab 7 SCH-I800 and boot up into customized Android 4.1.2 Jelly Bean ROM CM10. The first boot will take time, so be patient!
Returning to Previous ROM: To go back to your previous ROM, boot into recovery, select backup and restore then restore your previous ROM by selecting it from the list.

All done you are now all done with the flashing start your device cheers.