[Redmi 9A Guides, News, & Discussion] Ivan.Adriazola:
OK, it got unbricked, Im guessing Ill brick it again once I try installing ArrowOS for the second time, but for now, Ill try and sumarize what Ive done since I had the phone on OFW.

To get the phone hard-bricked:

I unloacked bootloader and installed Orange fox succesfully then I bricked my phone while trying to flash Global MIUI (as the first step to install ArrowOS but notice it is totally unrelated to ArrowOS), there is a detailed explanation of how I did it here

https://xdaforums.com/t/rom-a11-arrowos-garden-29-12-2021-unofficial.4382295/page-2#post-87705943

Trying SPFlash Tool to unbrick my device

My xiaomi redmi 9A was bricked at this point, I described it as:

"the phone just vibrates after a while holding the power button and the screen doesnt even turn on, it isnt recognized by the computer, and if I try to boot into recovery the same happens but the screen turns on for a fraction of a second whith the redmi logo then turn off again, It is not recognized by the computer in this state either"

after gaining some experience with it, I think adecuate to say that the phone still vibrated when holding the power button, but at least the screen did not turn on and as I said; "it wasnt recognized", but just to be clear, what I mean by that is that the PC did absolutely nothing when I pluged the phone in, later after some failed attempts at fixing it, this changed, now the computer prompted me a message explicitly saying, "this device is not recognized" if it was actually recognized before or not is above me.

anyway, back to the moment right after hardbricking my phone in the first place:

I tried using SP flashing tool with this video

but the video is old and after some links died not all the files where provided, (it did however provide a functioning method to disable protection)

so what I did was mix and match different files from diferent sources, and try different methods from diferent videos using SPFlash tool, wich was admitedly a bad idea, the main issue with it was that it symply stayed long periods of time on "download da 100%" with no error message prompting, so i could only stop it change the files and try again, sometimes disconecting the phone, bypassing security with (vol+ vol-) and repeating.

but at one point, the phone did nothing (from now on by nothing I mean not even vibration), the vol+ vol- security did not work, then I tried:

power button alone; noting

power vol+; nothing

power vol-; nothing

and when connected to the PC it told me "this device is not recognized" so the device was totally unresponsive, total brick.

at this point I had already halfly gave up, I enjoy the process, but it was just so unsatisfactory to fail again and again that I just didnt want anymore.

It fixed itself (still hard-bricked but responding).

Now how this got fixed, I actually dont know, I thought maybe if I wait for a while it will respond again, so after two hours it was still the same, I thought maybe if I charge it, after a while with it charging, let it discharge for a while (some odd days), fully charge it (another day or so), and all of those did nothing.

Then I just left it on my desk for like another day when I decided to just try to turn it on one final time and it responded (I dont know what happened I dont know what worked I have several charger boxes and cables plus the pc usb ports, maybe one of them was defective, maybe the one I used lastly was just better, I dont know, but something worked) maybe it just needed around 5 days to work again, i think when it worked for the first time it was plugged to an outlet, Im sorry I cant be more helpful)

now the phone just vibrated after any of the regular button combos, but it no longer displayed anything on the screen if I tried to boot into recovery, but, the PC no longer prompted me that the phone was not recognized, so I could try again.

What actually completely un-bricked my phone.

(This first step is a substitute to the OP requiremeents 5 and 6 used on steps 1 8 9 10 11, this didnt work for me on windows 10, maybe it was just me , but it didnt work)

I installed the Python3.9.1, MTK driver and libUSB I left this files attached as "extra installs", and did it according to how its done on this video

The video is in spanish so if you need extra assistance you can ask me about it or search how to install libUSB wich is the only one I think needs special attention on how to install it (also MTK gave me an error but apparently always does, I tried putting adb on the install folder but Im pretty sure this did nothing as it just gave me a different error)

then, you extract what I left on "ByPass OFF", and run broom.bat a cmd will open up telling you its waiting for a device

(from now on you cant unplug your phone, if you do you have to restart from here)

You plug your bricked phone, and press both vol+ and vol- at the same time until the cmd tells you something like this

View attachment 5762617

then you go to SPFlash tool latest version, (I used SP_Flash_Tool_v5.1924_Win but im pretty sure any one will work)

youll need the ROM that OP provided, its this one.

View attachment 5762619

its 4.22 GB so download it with time, its not a quick page to download from even tho I have "good" internet (around half an hour to a full hour)

you extract it (i recomend using winrar)

and put the scatter file youll use, on the extracted ROM folder, in the image folder, you can download the three scatter files that are for 12.5.4.0 RCDMIXM from the page OP provided and try them all, i left down here the one that worked for me anyway but I dont know what will work for you.

after that I launched the SP Flash tool, and selected the "no auth .bin" provide by OP as Download agent.

(it is posible you get this error

fix it and try again)

as Scatter file you go to the extracted ROM\image and selecth the Scatter file you want to use (again, I left the one I used down here, I have no idea if its the same one that comes with the ROM, also its important it is on the right folder in the extracted ROM)

leave auth blank

I did not select UART port, It didnt work for me, auto USB worked better for me.

you change the dropdown menu to Firmware update

and finally start the program by pressing the download button.

this should work and youll get a prompt like this.

View attachment 5762625

after it had finished I had to unplug my phone and plug it on an outlet for it to let me turn it on, I tried like 3 times before with it still pluged to the PC but it didnt work for some reason, I did not try with it just umpluged so who knows) it turned on to logo, and in around 10 minutes, it asked me to set up the phone as first start like when its brand new, (it was however different to how it used to be, so I know I at least installed a different ROM, do with that info what you will)

Whatts next?

I havent checked if I still have the orange fox recovery installed, tho I doubt it. and also how do I install ArrowOS now? can I do it from spflash tool? thatd be great, is there a better Custom ROM?

Thanks

Also thanks to OP: Yuarian that even if it didnt work for me as is, it still ended providing me with most if not all the tools I needed to unbrick it, and Im pretty sure the ones that didnt work failed becasue I had residual trash files from previous attempts that screwed over his.

anyway see you around.