[Device Reviews and Information] omid:
The Solution

Sir Whatever you ever heard about " bricking this Phone (G750) " & " Missing NVRam" is SIMPLY BOOOLLSHEEEET .

During the whole lot of messing around this phone (i.e wiping, formatting, deleting bootloader, flashing custom recovery and custom ROM, flashing original ROM and recovery via SPFlashTools, Backing up and Restoring) your phone might be eventually rendered into an unwanted situation. These situations happen when phone has only recovery and not the ROM or when phone doesn't have recovery either. Rarely but this phone can also have ROM and boot to OS while it has not recovery which is not our issue.

BUT THE KNOWN AS BRICKED ISSUE IS

when you mess around with the Preloader . Regarding the situations what you see is as follows:

1- Not booting into android system but ( whether showing any logo or animation on the screen or not) can access the recovery

* Go into recovery, ( logically it should be custom recovery otherwise your phone would always boot to system )

Make a factory reset and wipe dalvik and cache and reboot. If still no go, once again go to recovery and restore any backup you have and reboot. If you don't have any backup. you can do 3 methods.

A) download required files for flashing via SPFlashtools and also download appropriate ROM and flash your phone via SPFlashtools.

B) using a pc download a custom ROM zip file for your phone and a custom recovery if required and transfer files to the sdcard and install them via recovery.

C) you can also find update.app files which are official ROMs and directly flash them with held volume pressing power. should original recovery be installed via SPFlashtools first.

2- Not Booting into android system and ( whether showing any logo or animation on the screen or not) can not access the recovery. (Only Vibration)

* Use only Method A above. If you face error in SPFlashtools then the driver in the Device Manager must be set as "... ADB ..." . Get help from the 3rd solution BELOW. THIS ABSOLUTELY WORKS. ONCE DONE you can go with other methods if you wish.

3- Absolutely Dead Phone. Nothing happens when pressing power and any attempt to use SPFlashtools ends with error.

* This issue is really easy to solve. Put the battery out. Wait 5 seconds and put it back in the phone. In your PC go to the device manager. Expand the Ports section. While watching the ports section , connect phone to the USB. A new port will be added and a after a few seconds will be gone. You have to right click on the port and choose Update Driver as soon as it appears. If you run out of time simply disconnect and connect the phone to the USB again.

when the Update Drivers window opens choose Browse My Computer ... then choose Let Me Pick ... . In the next window remove the tick of Show Compatible Hardware . Disconnect the phone ( the port is gone by now anyway ). If you look up in the list of Compatible Hardware there must be two items which contain the word " Preloader ". What you have to do is to update the driver to both of them ( one for each time ) and try SPFlashtools to flash a ROM to your device. Having wrong driver SPFlashTools ends with error. THIS ABSOLUTELY WORKS.

P.S the serial number and IMEI of your phone can NOT get lost or deleted or removed. If IMEI No is unknown in a ROM, that's just because modem files are NOT there. you have to simply flash modem zip files via recovery or use MTK droid tools to restore previously backed up NVRam ( i.e Modem files)

Good Luck