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I couldn't have said it better myself. Hang in there, take care

Please keep us updated if/then you are able to reflash it

I am running Arch Linux. this is a rolling release, there is not real version.
When I use a EMS usb cartridge, I get this:

Bus 002 Device 054: ID 1908:0102 GEMBIRD
1229731.610554] usb 2-1.4: reset full-speed USB device number 54 using ehci-pci
[1229731.708093] usb-storage 2-1.4:1.0: USB Mass Storage device detected
[1229731.708228] scsi host12: usb-storage 2-1.4:1.0
[1229732.711227] scsi 12:0:0:0: scsi scan: INQUIRY result too short (32), using 36
[1229732.711235] scsi 12:0:0:0: Direct-Access     BennVenn 's Joey-Squinson  v1  PQ: 0 ANSI: 2
[1229732.717099] sd 12:0:0:0: [sde] 1114112 512-byte logical blocks: (570 MB/544 MiB)
[1229732.717817] sd 12:0:0:0: [sde] Write Protect is off
[1229732.717821] sd 12:0:0:0: [sde] Mode Sense: 55 53 42 43
[1229732.718449] sd 12:0:0:0: [sde] Incomplete mode parameter data
[1229732.718455] sd 12:0:0:0: [sde] Assuming drive cache: write through
[1229732.727951]  sde:
[1229732.730319] sd 12:0:0:0: [sde] Attached SCSI removable disk

I get one partition:
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) p                                                               
Model: BennVenn 's Joey-Squinson (scsi)
Disk /dev/sdf: 570MB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Disk Flags:

Number  Start  End    Size   File system  Flags
1      0.00B  570MB  570MB  fat16

(parted) 

When I try to mount it:

sudo mount /dev/sdf  -o ro -t vfat /tmp/tttt
[eric@pc GB303]$ ls /tmp/tttt
ls: cannot access /tmp/tttt/?�o?.=?o: Input/output error
ls: cannot access /tmp/tttt/?�_?.N?o: Input/output error
ls: cannot access /tmp/tttt/
?`
h?: Input/output error
ls: cannot access /tmp/tttt/
?.�??: Input/output error
ls: cannot access /tmp/tttt/?�m(hm.�B: Input/output error
ls: cannot access /tmp/tttt/?N?M?L�.: Input/output error
ls: cannot access /tmp/tttt/��.

...
Using windows in a VirtualBox, everything is working fine.
The capacity seem to be 8MB (which seems correct), not 570MB
Under the USB device , I can find:
USBSTOR\DISK&VEN_BENNVENN&PROD_'S_JOEY-SQUINSON&REV__V1\6&A1F30D8&0

VirtualBox sees the device as "bennvenn usb linker v1.0"

I don't really like the interface. It tries to look like a genesis, with sonic stuff, big buttons and such, but I find it is confusing.
Some functions are hard to find because you don' t even know if it is a drawing or a clickable zone...
but it is powerful, yes, and allows to tweak everything

In fact I contacted Jarek, and he told me that:
* the Chip Maestro is powered by an Atmega168 chip, supported by a low-power CPLD
* all the source code is available
* to flash the C M, we need these tools:
  1. Small screwdriver to open the Chip Maestro
  2. USBTiny ISP (i prefer the one from adafruit because it works in windows 8)
  3. 6 Pin Tag Connect Cable ( http://www.tag-connect.com/TC2030-IDC ), you can also solder wires to the programming pads if you're handy with an iron and want to save 40 bucks.

I think there is an arduino inside and that it can be flashed normally

Maybe you could use BennVenn's flasher?