I tried to update my MK3S to 3.9.0 but it failed and now all I can see is square

I've tried it multiple time, even 3.8.0 is failing to flash

I tried it with 2 computers and 2 cables

log

avrdude: Version 6.3-20160220-prusa3d, compiled on Feb 11 2019 at 18:25:11
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch

System wide configuration file is "C:/PROGRA~1/Prusa3D/Slic3rPE/resources\avrdude\avrdude.conf"

Using Port : COM6
Using Programmer : wiring
Overriding Baud Rate : 115200
AVR Part : ATmega2560
Chip Erase delay : 9000 us
PAGEL : PD7
BS2 : PA0
RESET disposition : dedicated
RETRY pulse : SCK
serial program mode : yes
parallel program mode : yes
Timeout : 200
StabDelay : 100
CmdexeDelay : 25
SyncLoops : 32
ByteDelay : 0
PollIndex : 3
PollValue : 0x53
Memory Detail :

Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack
----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
eeprom 65 10 8 0 no 4096 8 0 9000 9000 0x00 0x00
flash 65 10 256 0 yes 262144 256 1024 4500 4500 0x00 0x00
lfuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
hfuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
efuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
lock 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
calibration 0 0 0 0 no 1 0 0 0 0 0x00 0x00
signature 0 0 0 0 no 3 0 0 0 0 0x00 0x00

Programmer Type : Wiring
Description : Wiring
Programmer Model: AVRISP
Hardware Version: 15
Firmware Version Master : 2.10
Vtarget : 0.0 V
SCK period : 0.1 us

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.02s

avrdude: Device signature = 0x1e9801 (probably m2560)
avrdude: safemode: hfuse reads as D8
avrdude: safemode: efuse reads as FD
avrdude: reading input file "Z:\Firmware.ino.hex"
avrdude: writing flash (248896 bytes):
avrdude: stk500v2_command(): command failed

Writing | ################################################## | 100% 44.96s

avrdude: 248896 bytes of flash written
avrdude: verifying flash memory against Z:\Firmware.ino.hex:
avrdude: load data flash data from input file Z:\Firmware.ino.hex:
avrdude: input file Z:\Firmware.ino.hex contains 248896 bytes
avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 31.88s

avrdude: verifying ...
avrdude: verification error, first mismatch at byte 0x3c000
0x00 != 0x25
avrdude: verification error; content mismatch

avrdude: safemode: hfuse reads as D8
avrdude: safemode: efuse reads as FD
avrdude: safemode: Fuses OK (E:FD, H:D8, L:FF)

avrdude done. Thank you