Test Point on Sony M4 Aqua (hard brick). - Sony Xperia M4 Aqua

Update:
My phone was not recognized by the computer since the usb flex was broken, the data lines did not work, but the charging lines did.
Watch this video for a solution:
Hello and thanks for reading! The whole problem started with a bad rom, I flashed it and when I turn on the device, the basic things, Wi-Fi, data, etc ... did not work, but worst of all, the PC does not recognize it, for therefore I cannot flash again with sony's original rom. So, researching there I found that there is a way to fix this kind of problem with a method called a test point, but I only saw other devices and on mine I didn't find any information about this.
I found these images but I don't understand much...
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https://bit.ly/33Vxt4f
(This is a video of what I found, but on another device.)
If someone knows how to do this, it would help me a lot. Thanks in advance for reading the post!

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Hi RenzoMag.
The testpoint method was used to force the phone in a "factory mode" (I don't know the exact terms), expecially useful for Mediatek based phones.
The point highlited on the images are the "communication lines" to direct access the e-MMC memory chip.
You can found info at page 13 of this thread
xda-developers forum
> Amazon 7" Kindle Fire HD, 8.9" Kindle Fire HD, Kindle Fire 2
> Kindle Fire 2 Q&A, Help and Troubleshooting
> [Discussion] Direct access to e-MMC to fix bricked KF? - CONFIRMED! by kurohyou
Hope this can help you.
(Better if you use "low voltage adapter ". I brought one from exploitee dot rs. Usually used to hack Nintendo 3DS)

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maria.aiva said:
Hi RenzoMag.
The testpoint method was used to force the phone in a "factory mode" (I don't know the exact terms), expecially useful for Mediatek based phones.
The point highlited on the images are the "communication lines" to direct access the e-MMC memory chip.
You can found info at page 13 of this thread
xda-developers forum
> Amazon 7" Kindle Fire HD, 8.9" Kindle Fire HD, Kindle Fire 2
> Kindle Fire 2 Q&A, Help and Troubleshooting
> [Discussion] Direct access to e-MMC to fix bricked KF? - CONFIRMED! by kurohyou
Hope this can help you.
(Better if you use "low voltage adapter ". I brought one from exploitee dot rs. Usually used to hack Nintendo 3DS)
Click to expand...
Click to collapse
Hello, I had not seen an answer on my phone for a long time, I had that problem months ago, I tried everything for weeks and finally gave up and left it saved for lack of time ...
Do you have any idea of ​​any solution for this device that was totally bricketed because of a bad rom?
Forgive me if I do not understand you or do not understand me, I am using google translator ...
Thanks for the reply!

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Hi. Did you re-flashed rom with Sony tool or flastool?

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maria.aiva said:
Hi. Did you re-flashed rom with Sony tool or flastool?
Click to expand...
Click to collapse
The problem is that, the corrupt rom that is installed causes the computer not to detect the phone as a mobile device, try flashtool, sony companion, etc, but the same computer tells me "unknown device", detects that there is something but you don't know why, the rom's usb connection files will be damaged ... That is why my question about whether there is a test point for this device, because for other devices that if you can these types of problems are fixed that way. Do you have someone who knows a little more about this topic?

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picture shows eMMC pinout, no test points