[Android Head-Units] Marekloop:
How to reflash YT9213A from brick

So to describe how to revive your YT9213A after some mistake with brick result :)

Hardware you need:

USB cable male-male, PC (OS: Win7, XP), screwdriver (+), 2 pieces (10cm) of thin (0,5mm) cooper wire, somebody who can help you to connect usb connectors when you will hold wires on testpoints, or micro soldering station (explained later)

You do not need power supply for radio. Process is done with radio unplugged from power.

Software you need:

SP flash tool, SP_Driver_v2.0, MTK_USB_All_v1.0.8, Mediatek Driver Auto Installer v1.1352,

To start install all software and drivers on your PC (during installation of SP Driver v2.0, you will need to reboot PC).

Download - DUMP (recovery files) - YT9213A_00009_V001_20191126.zip ( https://we.tl/t-6nDsdnIgHn )

Disassemble your device to find test points: [IMG="Test points"]https://xdaforums.com/attachment.php?attachmentid=4954973&d=1582215108[/IMG]

It is located on the inside of electronic board (so put down back cover and disassemble electronic board)

Unzip DUMP file

Start SP flash tool, in SP flash tool press Ctrl+Alt+V (in window header you should see Advanced mode to appear)

In main window check Download-agent line, it should be loaded automatically with "MTK_AllInOne_DA.bin", in Scatter-loading File search unzipped DUMP folder for "MT3367_Android_scatter.txt". Authentication file line remains empty.

In list of files check only "preloader" line. Uncheck all other.

In main menu select Window -> Write Memory (new Tab will appear)

1; In File path search in DUMP folder for ROM_0_BOOT1

2; In Begin address line write in " 0x0 "

3; In Region pick EMMC_BOOT_1

4; Hit Write memory button.

5; Now connect USB male-male cable into device's USB port 4 pin (smaller one called D), don not connect it to PC now, but prepare it close or ask somebody to hold it close (as testpoints are very small and it is impossible to make it all together alone).

6; Now use thin cooper wires and connect testpoints described in picture above (Vol UP 1&2) and connect USB cable to PC.

You can solder wires to this points but you need PRO tools for that.

7; Now you should see progress in bottom line of SP flash tool (first red line to check memory and afterward download progress for ROM1, after success it will write OK!), you do not need to hold test point connected during this process. When finished you should disconnect USB cable.

(For me worked to connect only testpoint 1&2 (I tried to solder wires to it, but only soldered this two points together and then needed to clean solder from this contacts as it was short circuit :P ). If download process do not start you will need to connect also testpoint 3&4 altogether or 1&2 and then 3&4).

Than you need to do similar for EMMC_BOOT_2 part of memory so start with point no.1; Find and select ROM_0_BOOT2, address remains 0x0, change region to EMMC_BOOT_2 and continue with point 4 to 7.

You need load ROM_0_BOOT1 into Region EMMC_USER too. So again start with point no. 1; Select ROM_0_BOOT1, address 0x0, Region EMMC_USER and continue with point 4 to 7.

Next you go back to download Tab and Check all files except "preloader" line (first one).

Then hit Download button and repeat points 6; and 7;.

After this one you should be Done.

Connect your radio to power and check if it will start.

First start will take long time to load everything, so be patient (5+ minutes).

If you will need, send a question.

Do anything on your own risk ;)