[General Questions and Answers] TheDrive:
This device have made by Chinese/Indian company Borqs. The code name Bennu-M. Platform is Qualcomm APQ8016 (MSM8916 w/o modem). There should work standard method to bring EDL mode. Hold Vol+ and Vol- at power on (press power). Then connect to the PC. Thus device will stay look dead, however should be detected as Qualcomm QDLoader 9008 on the PC side. This is the factory described method.

You can flash factory firmware from this mode using external bootloader (programmer) for MSM8916 firehose protocol. This procedure is described in the thousands of manuals around the net. Qualcomm tools like QPST or QFIL can be used as good as many 3rd party utils to flash and manage any another available way. Many professional 'box' tools should support this device too but only as 'generic' msm8916 (if applicable).

However I can't find the firmware package for this device anywhere. You should ask and require the manufacturer/distributor to publish firmware, the source code and all the corresponding matherials to be able to flash and rebuild firmware from sources in any manner you want without any limitations as required by GNU/GPL free open source software licenses this firmware is obligated to.

Everyone who have the device working or software dead, can try to dump the current firmware and data, stored on the internal eMMC memory module in part(s) or in whole image using free QTools project utilities and suitable external bootloader with ability to dump eMMC, not only to flash as many factory supplied programmers do. There are programmer(s) for MSM8916 available in the project repo. Read and understand manuals carefully before trying anything!

There is definitely another ways to root, dump, flash, manage the device in any manner YOU WANT, not only the way you are "allowed" to use your own device by manufacturer/distributor. FTA!

You can root the device then dump all the multiple partition images manually (dd if=/dev/block/mmbblk0...... of=/sdcard/......) or using built custom recovery like CWM/TWRP for your device. Please note, kernel sources are important but not mandatory to build e.g. CWM. You can build one using CWM image from the similar device and the kernel (boot/recovery) image binaries from your device. There are good manuals and image repacking utils available around like e.g. AndImgTool.

There are the way to produce factory image from the eMMC/partitions dump(s). Use utils like R-Studio to dump particular partition images from the eMMC dump (it's like whole HDD or UFD image with all the sectors raw, one by one, w/o any modifications/compression/etc) Manuals / utils are avavailable to make e.g. sparse and xml scripts set which is flashable by the programmer in the EDL mode (i.e. from any damaged state, because EDL is built in to the PBL and masked to the internal CPU ROM, thus can not be damaged in any manner, except firing the CPU up).

You can also flash partition images from the more common Fastboot mode, unless eMMC GPT and bootloaders (SBL/RPM/TZ/ABoot) stay intact (logo showed). You can't dump from fastboot, which is common due to the (foolish) 'safety' requirements. It's security by obscurity and is definitely not for your favor, but for the corps control over you and force to send valuable private data to foreign clouds.

Please share eMMC full and/or partitions dumps using reliable 'neverending' file cloud/hosting since there is no factory firmware available yet (ever). I do not own this device and never seen being overseas, so I can't share. Help each other and f... the mfrs and matrix!