Firmware 3.7.2 update checksum issue
Tried to update my stock MK3 (still on original firmware since last year 3.6.0-2069). Connections ok and file transfers to printer. Subsequent checksum(s) fail and update fails. Tried a couple of other versions with same result. Tried two usb cables and two different usb ports. Rebooted PC and rebooted MK3 but still the same problem:
From PrusaSlicer 2.00:
avrdude-slic3r -v -p atmega2560 -c wiring -P COM4 -b 115200 -D -U flash:w:0:K:\AD\April 10\prusa3d_fw_3_7_2_MK3\prusa3d_fw_MK3_3_7_2_2363.hex:i
avrdude-slic3r: Version 6.3-20160220-prusa3d, compiled on May 20 2019 at 18:52:49
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch
Using Port : COM4
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-slic3r: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.01s
avrdude-slic3r: Device signature = 0x1e9801 (probably m2560)
avrdude-slic3r: safemode: hfuse reads as D0
avrdude-slic3r: safemode: efuse reads as FD
avrdude-slic3r: reading input file "K:\AD\April 10\prusa3d_fw_3_7_2_MK3\prusa3d_fw_MK3_3_7_2_2363.hex"
avrdude-slic3r: writing flash (253812 bytes):
Writing | ################################################## | 100% 45.56s
avrdude-slic3r: 253812 bytes of flash written
avrdude-slic3r: verifying flash memory against K:\AD\April 10\prusa3d_fw_3_7_2_MK3\prusa3d_fw_MK3_3_7_2_2363.hex:
avrdude-slic3r: load data flash data from input file K:\AD\April 10\prusa3d_fw_3_7_2_MK3\prusa3d_fw_MK3_3_7_2_2363.hex:
avrdude-slic3r: input file K:\AD\April 10\prusa3d_fw_3_7_2_MK3\prusa3d_fw_MK3_3_7_2_2363.hex contains 253812 bytes
avrdude-slic3r: reading on-chip flash data:
Reading | ####avrdude-slic3r: stk500v2_recv(): checksum error
###avrdude-slic3r: stk500v2_recv(): checksum error
####avrdude-slic3r: stk500v2_recv(): checksum error
###avrdude-slic3r: stk500v2_recv(): checksum error
avrdude-slic3r: stk500v2_recv(): checksum error
###avrdude-slic3r: stk500v2_recv(): checksum error
############avrdude-slic3r: stk500v2_recv(): checksum error
###avrdude-slic3r: stk500v2_recv(): checksum error
########avrdude-slic3r: stk500v2_recv(): checksum error
###avrdude-slic3r: stk500v2_recv(): checksum error
####### | 100% 32.83s
avrdude-slic3r: verifying ...
avrdude-slic3r: verification error, first mismatch at byte 0x5e41
0x20 != 0x32
avrdude-slic3r: verification error; content mismatch
avrdude-slic3r: safemode: hfuse reads as D0
avrdude-slic3r: safemode: efuse reads as FD
avrdude-slic3r: safemode: Fuses OK (E:FD, H:D0, L:FF)
avrdude-slic3r done. Thank you.
RE: Firmware 3.7.2 update checksum issue
Try downloading the firmware from the Prusa site again.
Also - I presume you are using Prusa Slicer to flash. If not, expect issues.
And you may want to try a factory reset with DATA CLEAR option selected.
RE: Firmware 3.7.2 update checksum issue
Thanks for the reply. I tried PrusaSlicer 2 as well as V1.4. Just checking the machine before factory reset and the firmware shows as 3.7.2.2363 which is a bit puzzling. Everything seems to work and I am currently trying my first petg print. One thing is curious, having preheated for pet(g) I cannot select first layer calibration other than pla and the temperatures are reduced accordingly. This also happened on V3.6 and I thought it may be a bug that was cleared in a later update, obviously not. At this stage I am reluctant to do a full reset unless you think it would help.
RE: Firmware 3.7.2 update checksum issue
First layer cal is always PLA; as far as I know you can't do a first layer cal with anything else.
You need to select the Z-offset option, sorry, forget the precise name: maybe Live Adjust Z ??, but it shows up when you start to print, and is also under Tune. In any case, I use a small part that has a large area that gives time to actually adjust, review, adjust a few times. You can also read Jeff's Life-Z Adjust My Way post here in the forums.
RE: Firmware 3.7.2 update checksum issue
Yep, created a 100mm square pad for testing. Not sure I have ever seen the "pla only" restriction but I guess it is for a good reason. Looking through the menu I see my board is reported to be einsy_10a when it is the RAMBo.