I already know how to mess with 3ds systems, i'm not asking for advice. i'm telling you what i have.
it was a partial brick on 10.3. would only boot randomly, but no entry points for homebrew worked at that time. then soundhax came along. i used soundhax to downgrade to 9.2. the system was booting more reliable but still volatile and prone to crash (especially when entering system settings, every time it crashed).
i tried upgrading to 11.2, 11.1 and back down to 9.2 via hard mod. someone suggested tinyformat. so i did it. now the system doesn't turn on at all no matter which working NAND dump i flash back to it. the blue light turns on and nothing more. i've flashed and re-flashed 9.2, 10.3 and 11.1.
im not an average user. i understand all my options and i hope i'm not coming off as mean but every time i suggest something about some hax that comes out, someone thinks they can fix my brick with troubleshooting. I've spent DAYS working on this and I had a glimmer of hope until that tiny format

I don't care what can/cannot occur in theory, in practice, this is what happened.
if i can get a9lh installed on the dump and flash back, im hoping this will help me to fix the brick although i've pretty much given up hope.