PyTrack 2.0 - esp_image: Checksum failed. Calculated 0x36 read 0x16

[Raymond Limpens]

My PyTrack 2.0, in combination with the gpy, is having issues with booting up after I updated the firmware version to version 16 (pytrack2_v16.dfu).
It keeps throwing the following error that the checksum is failing for the device. Also, I tried to find an older firmware version or perform an update via the PyCom update firmware tool but this tool also keeps failing.

I tried to do the whole upgrade process on multiple PC's (Linux and Windows), but no success so far.

configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff8020,len:8
load:0x3fff8028,len:2128
load:0x4009fa00,len:19760
entry 0x400a05bc
E (552) esp_image: Checksum failed. Calculated 0x36 read 0x16

Logs of the firmware upgrade progress:

dfu-util.exe -D pytrack2_v16.dfu
dfu-util 0.9

Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2016 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to http://sourceforge.net/p/dfu-util/tickets/

Match vendor ID from file: 04d8
Match product ID from file: f014
Opening DFU capable USB device...
ID 04d8:f014
Run-time device DFU version 0100
Claiming USB DFU Runtime Interface...
Determining device status: state = dfuIDLE, status = 0
WARNING: Runtime device already in DFU state ?!?
Claiming USB DFU Interface...
Setting Alternate Setting #0 ...
Determining device status: state = dfuIDLE, status = 0
dfuIDLE, continuing
DFU mode device DFU version 0100
Device returned transfer size 64
Copying data from PC to DFU device
Download        [=========================] 100%        16384 bytes
Download done.
state(2) = dfuIDLE, status(0) = No error condition is present
Done!```