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Calibre stopped working with Sony PRS-650 - reports write protection

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Hi,

I followed https://www.mobileread.com/forums/sh...d.php?t=118560 but Calibre 2.7.8 (Fedora 24 64bit) won't establish connection to my Sony PRS-650. It used to work without problems (last time I checked was in October, so any update since then might have broken it).

The output of the diagnosis reports:

Code:

calibre 2.78  embedded-python: False is64bit: True
Linux-4.9.13-101.fc24.x86_64-x86_64-with-fedora-24-Twenty_Four Linux ('64bit', '')
('Linux', '4.9.13-101.fc24.x86_64', '#1 SMP Tue Mar 7 23:48:32 UTC 2017')
Python 2.7.13
Linux: ('Fedora', '24', 'Twenty Four')

(...)

Looking for devices...
USBDevice(busnum=1, devnum=7, vendor_id=0x054c, product_id=0x031e, bcd=0x031a, manufacturer=Sony, product=Sony Digital Book Reader, serial=08004610011DE1F5)
                Detected possible device PRS505
 
Devices possibly connected: SONY Device Interface, 
Trying to open SONY Device Interface ... failed
Opening of the following devices failed
<calibre.devices.prs505.driver.PRS505 object at 0x7f32c597fd50>
Traceback (most recent call last):
  File "/usr/lib64/calibre/calibre/devices/__init__.py", line 158, in debug
    dev.open(det, None)
  File "/usr/lib64/calibre/calibre/devices/usbms/device.py", line 864, in open
    self.open_linux()
  File "/usr/lib64/calibre/calibre/devices/usbms/device.py", line 638, in open_linux
    self.filter_read_only_mount_points()
  File "/usr/lib64/calibre/calibre/devices/usbms/device.py", line 676, in filter_read_only_mount_points
    %self.__class__.__name__)
DeviceError: Main storage of PRS505 is write protected. This usually happens due to filesystem errors. (translated from: Hauptspeicher von PRS505 ist schreibgeschützt. Dies passiert üblicherweise aufgrund von Fehlern im Dateisystem.)

The connected device is not a PRS505 but a PRS650. As far as I can tell the reported write protected storage device is the 'SETTING' partition containing Sony software which is read only. When running fsck the device has the dirty bit set, any attempt to reset it fails - i.e. Calibre won't establish connection.

Has anyone an idea how to make Calibre ignore the 'SETTING' partition and work correctly with the 'READER' partition (which is writeable)? Any help is highly appreciated.

Best,
bRick57720

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