If your Dell Venue 7 3740 Merrifield has been stuck at Dell logo or its software has been corrupted, you can flash the device to get it back in working state.
2- Flash Tool
Steps to Flashing:
1- Download the Stock ROM & Flash tool. Place it in single folder.
2- Run Flash tool first and install it.
3- Run P708T driver.
4- Now run iSOC USB driver.
5- Run Intel Android driver setup.
7- Extract the stock rom.
8- As soon as all driver get installed, run the tool.
9- Select 2nd tab as shown in image.
10- Click on Option and select Modify Setting.
11- Select the last Download Tab and select Enable GP Flag override. Chnge the value from 0x80000001 to 0x80000007 and click on OK.
12- Select File, DNX_FWR_PRQ.bin in FW Dnx.
13- Select For_Product_IFWI_PRQ.bin in IFWI.
14- Select DNX_osr_PRQ.bin in OS Dnx.
15- Select Droidboot.img.POS.bin in OS image.
16- Click on Begin Download.
17- Connect Tablet to PC by holding Volume UP key and connect it to USB cable until driver get installed.
18- Now flashing starts and when completed, Success: FW + OS Download Completed will appear in tool box.
19- Now, the tablet will automatically enter into recovery mode.
20- Under Firmware folder, run P802_Flash_device_lte. Flashing will start of its own.
21- When completed, cmd will show a message Press any key to continue.
22- Unplug cable, as flashing is completed.