[Upgrading, Modifying and Unlocking] cesarr4:
Guys: I need your understanding, experience, patience and HEEELP!!!

The history:

2 months ago, I bought a new HUAWEI GR3 (TANGO) TAG-L23. Processor = MT6753T

I tried to root it using KingoRoot. I Messed it up... Got a soft-brick: splash screen boot loop. At that moment, I still had access to Fastboot and Recovery mode (stock recovery).

After tons of days googling, found a TWRP recovery that someone claimed that worked in GR3.

I decided to flash it using fastboot commands from my PC. Result = OK. Flashed and worked like a charm.

Tired of searching a stock/custom firmware for GR3 TAG-L23, I decided to download and flash a GR3 TAG-L22 rom using TWRP.

Result = Messed it up again... this time worst... Hard-bricked I think: the phone didn't show any light, couldn't boot it again in any mode... Dead...

The only hope I had is that it is detected by Windows for about 10 seconds as MEDIATEK USB PORT (COMxx) where xx changes when I connect it from one USB port to another.

Since then, I tried almost every tutorial/video/solution/forum/website over the internet, tried almost every SP Flash tool version from v3.1224 to v5.1628, downloaded every scatter.txt for MT6753 processor, tried changing with/without battery option in SPFT, pressing every phone buttons combos, with no luck...

I always get the same error: S_FT_ENABLE_DRAM_FAIL (0xFC0)

Downloaded and installed almost every driver I found on internet: not overwritting them... I created a Virtual Machine, and test them separately using snapshots. Result = Same DRAM_FAIL error.

last week, got another HUAWEI GR3 TAG-L23, untouched, brand new...

I did the following with the new one:

Flashed TWRP recovery using fastboot commands = OK

Rooted it using SuperSU = OK

executed tons of ADB commands that found over the internet, to dump the partition table and stock rom using dd command = OK (I think... what I got is a bunch of files - system, lk, boot, logo, cache, frp, userdata, secro, recovery, nvdata, protect1 and 2, tee1 and 2, and so on).

Using the partition table information, edited one scatter.txt file for MT6753 and, one by one, adjusted the partition info (start and lenght). I did it because when using any downloaded scatter file, and selecting the files that I got from dd commands, SPFT showed error messages saying them were wrong. After editing it and loading the files that I got from the second phone, SPFT recognized them as good ones.

But.... I'm still getting the d...mn S_FT_ENABLE_DRAM_FAIL (0xFC0) error

Also tried to get a rom backup and scatter file from the second phone using MTK DROID ROOT & TOOLS v2.5.3 with no luck: it shows all phone information (except IMEIs), a green rectangle shows up, but... a weird message appears at right: "ERROR: TotalBytesPerChunk Not Found. Set Default Page/Spare=2048/64 !!!". Then I click on "BLOCKS MAP" button, a new window appears showing the partition info (that already got using adb command prompt) and "create scatter file" button is grayed out... And if I try to perform the backup, it starts fine, but ends with error, and no file is backed up...

Let me mention that I already read and googled the totalbytesperchunk error and the grayed out button stuff and tried all alternatives too, and nothing worked.

My work environment:

PC = Laptop With 8 GB RAM / Windows 10 pro x64

Virtual Machines: Windows 7 pro 32 bits, Windows XP 32 bits, Ubuntu 32 and 64 bits...

What else can I do?

How can I use the second, rooted and working phone to get a rom/firmware working dump? it is possible?

If someone decides to help me, let me know what do you need (dumped files, downloaded scatter.txt files, screenshots, whatever you need...)