Brick Recovery or Format Flash and Install Firmware
Firmware Format and Installation Diagrams
Here is a general overview diagram providing an understanding of ota, firmware, and TWRP flashing. And flashing upgrade to 64bit on <= 4GB HUs.
https://mega.nz/folder/hDEhFAqZ#A0JuPIKhW83X5NZgL2NSWg/folder/QTllgKwA
4 Types of Bricking
There are generally 4 ways to brick the HU
Install the UI with fix resolution different than your HU
Install wrong firmware which is unable to display
Install wrong firmware that doesn't run at all
Install the wrong preloader and unable to connect to PC to flash firmware
1 & 2 can be recovered by display driver recovery method. #3 require full flash of firmware into flash memory. #4 require disassemble hardware and find the test points.
Tools
Windows 10 to run recovery software. Windows 11 may work also (didn't test) but some older threads says no but maybe obsolete info.
USB cord with USB-A male end to HU and the other end to the PC (USB-A or USB-C) Some older thread says <= 1m. I used ~2m and very old (from USB 1&2 era) and worked fine.
SIM tray tool or paperclip for triggering RST above power icon on the HU
USB Stick. FAT32 is preferred although I've used 64GB exFAT without problems.
HU USB Port
On the 5670B, only the 6pin USB port works to connect to PC for recovery. Some older thread for older HUs says 4pin USB but not true for this HU
Don't worry if you've plugged into the 4pin USB port during recovery. It won't connect.
Wrong Display Driver Recovery
Here is how to determine if this is your brick condition and how to recover
Flash Firmware (1.73.8 Upgrade or Brick Recovery)
General Overview Diagram here
Full Format + Flash Method
Full format will erase IMEI, see IMEI Repatch below.
WARNING Full format will erase all local activation codes for app. Read link Warning section for details
Missing Files Archived
metazone is often missing to do the full format + flash. Both 2-4G ad 6-8G metazone and logo are extracted and archived on mega
IMEI Repatch
TWRP Method
Setup flash_tool https://forum.xda-developers.com/t/ac8257-cpu-based-units-problems-questions-couldnt-find-any-info-about-it.4171219/post-88206723
Use TWRP to install the ota. Preferably an ota with same partition structure as one that failed. Easiest is just to use same firmware version #
64bit Firmware in <= 4GB HUs
My volume + - touch zone shifted after this upgrade.
UI Issues After Computer Firmware Flashing
Computer Firmware Flashing with formatting all of flash memory is like re-manufacturing the HU. Some UI issues occur require calibration/adjustment which was probably done at the factory
These issues seems to vary from all the different versions of this HU. Some have more and some less.
X Touch Coordinate Reversed
Volume + - Icon Touch Don't Work
The touch zones seems to have moved above the + - icon. All other touch icons above them works find (back, home, power)
Physical Dial Backwards
Recalibration
https://sites.google.com/view/yt5760bac8259/misc?authuser=0#h.lix51m8gz8cb
Display Image and Touch Inverted
Colors Messed Up
Maybe related to 6bit 8bit display difference. Can be toggled
Bricked and unable to connect to PC to flash firmware
Most likely wrong preloader was flashed in prior attempt. Recovery require opening HU logic board and find test point to flash in correct preloader. Read this post