[G Tablet General] guobug:
I hope my post will help somewhat those buddies who had the same problem or who will probably have this problem in future.

I had the problem that my gtablet couldn't power on after I did Nvflash. I'd been frustrated in the past week for searching the internet to find the way out.

The similar problem that tcrews had. (http://xdaforums.com/showthread.php?t=903684)

Also some posts I browsed:

http://xdaforums.com/showthread.php?t=999287

http://xdaforums.com/showpost.php?p=10951417&postcount=1

http://xdaforums.com/showthread.php?t=927006

http://xdaforums.com/showthread.php?t=971608

http://xdaforums.com/showthread.php?t=938706

I am grateful to tcrews and a lot of other buddies for their inputs which saved me lots of time, though i didn't find a right solution from their posts. Acidburn89's solution in tcrews's post (page 9) didn't work out for me either.I don't know whether tcrews solved his problem in acidburn89's method.

I tried all the methods I could find and nothing worked out for me. The only way I can turn the tablet on is to follow tcrews's post on rebooting the tablet by using nvflash (nvflash --bl bootloader.bin --download 9 recovery.img --go)

Some background of bricking my gtablet:

1.my gtab had CWM0.8.and was running rom "zpad clean 3.0" (before that it was TNTL, not any problem)

2.one week ago, I was trying to flash a rom from a chinese website, which was modified from the official malata zpad rom. This was the problem started from. After flashing (nvflash method),the tab was rebooting and stuck at "Tegra II" logo and couldn't never start with the new rom. At this moment, i could still power on and off the tab.

3.next I flashed my tab by following this link (http://xdaforums.com/showthread.php?t=861950) After flashing it, the tab couldn't not reboot, and could not power on. Every time I pressed the power button, it just went to the APX mode authomatically

(with black screen).Only using the above-mentioned method (from tcrews) I could start the tab.

The solution I finally tried out: (Take out your sdcard from the tab if you have one in it)

1.Have these two files ready: recovery-stock.img (download the attached recovery-stock.zip and change zip to img), and original gtablet update.zip. I copied this original update.zip file from my gtab and saved in my pc, i think you can also find links in this forum for the original gtablet roms,like this http://xdaforums.com/showpost.php?p=9837354&postcount=3 (not sure whether these are same as I extracted from my gtab originally, if not working, I can upload my rom for downloading)

2.Copy recovery-stock.img into the nvflash folder.

3.Start the tab by nvflash (tcrews' method)

4.Mount/Activate USB conncetion, and copy the original update.zip into the tablet internal sdcard.

5.(Not sure this step is a must or not). Download cwmod-internal.zip in the line http://xdaforums.com/showthread.php?t=865245, extract it and copy the folder "recovery" including the command file to the sdcard.

6.Power off the tab.

7.Power on to make sure you enter APX mode (you will see the black screen, but hear a bing sound)

8.Type in the Dos Command: nvflash --bl bootloader.bin --download 9 recovery-stock.img --go

9.Press and hold the Volume + on the Gtablet and press enter on the PC to execute the above line. You will see it starts to installing the original rom..(about 3 minutes)..and then power off autmotically after finishing flashing ! Dont worry.

10.Repeat step 7 and 8, and press enter (do NOT hold volume +!)

11.The tab will start to the TnT like the original one you had, and Magic now: you can turn off and turn on the tab NORMALLY!!

I tried this method with and without CWM. Both worked. So don't worry whether you tab has CWM or original recovery. My advice: flash your favorite rom using sdcard method instead of nvflash. If you want to nvflash it, save all the files we have used for possilbe repeation of our above job to get your tab back to life!!

I've received a lot of information and help from xda-development before, and hope my first post could contribute to our community a little bit.