MSI Z170I bricked, need suggestions

Jun 2, 2018
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Bought a returned board (Z170I GAMING PRO AC) from a shop (they said it had been returned in a pre-built PC and was working fine) and started having problems. During BIOS update system hanged and now doesn't POST.

Long story:
Wanted to update BIOS because system hanged on random intervals. First time I booted it automatically opened up the BIOS with the welcome message (keyboard instructions) and hanged. Thought that it was just a minor crash or something. Reseted the board from PSU cause power or reset pins didn’t respond. Then started the system again and left the fan monitor open(in the BIOS), after 5 minutes came back and system had frozen again, no response from power or reset pins.

Started to get quite suspicions and tried booting Ubuntu 18.04 LTS, worked fine for 20-30 minutes, during which connected to my local WiFi network, watched youtube and sent few files over bluetooth when suddenly system froze. No response from reset or power pins, no leds on board indicating a problem, picture on monitor frozen. Had to stop the system from PSU.

Booted Ubuntu up again, downloaded new BIOS to USB drive (FAT32), rebooted to M-Flash and started update, during which it froze at 75%. Waited 1 hour and stopped system from PSU cause no response from power or reset pins.

After that black screen. Power and reset pins work correctly (system shuts down and resets as it should). Fan keeps working normally, no debug leds are on. During start-up debug leds flash briefly and RAM led stays up for around 2 seconds then goes out, seems normal.

Tried re-seating ram, removing ram will cause ram debug led to come on.

Tried to put BIOS files on 4GB USB drive but the drives led never lights up in any of the USB ports.

If I messed up the board with updating bios, but the problem that caused it to hang in the first place is not my fault, can I still hope for refund or replacement?

Motherboard doesn't seem to have pins for internal speaker to hear beeps.

System:
MB: Z170I GAMING PRO AC
CPU: Intel Pentium G4400
RAM: HyperX HX426C15FB/4
PSU: Seasonic M12II EVO Edition M12II-520 Bronze
BIOS: Before update, it was dated 2015, probably the oldest

Monitor is in HDMI port, cant test display port cause I don't have monitor for that.