I don't have an SD card.
I changed the USB setting to File Transfer thru the Settings option. I don't see it thru the pull-down menu.
Here is the result after a reboot of the computer and Kindle, and the USB setting change. I plugged in the Kindle before opening Calibre.
Spoiler:
calibre 6.16 embedded-python: True
Windows-10-10.0.19045-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.19045')
Python 3.10.1
Windows: ('10', '10.0.19045', 'SP0', 'Multiprocessor Free')
Interface language: None
USB devices on system:
(USBDevice(vendor_id=0x5e3 product_id=0x608 bcd=0x8832 devid=usb\vid_05e3&pid_0608&rev_8832 devinst=2),
USBDevice(vendor_id=None product_id=None bcd=None devid=usb\root_hub30&vid8086&pid22b5&rev0035 devinst=3),
USBDevice(vendor_id=0x1949 product_id=0x5e1 bcd=0x223 devid=usb\vid_1949&pid_05e1&rev_0223 devinst=1),
USBDevice(vendor_id=0xbda product_id=0x5683 bcd=0x4273 devid=usb\vid_0bda&pid_5683&rev_4273&mi_00 devinst=4),
USBDevice(vendor_id=0x8087 product_id=0xa2a bcd=0x1 devid=usb\vid_8087&pid_0a2a&rev_0001 devinst=5),
USBDevice(vendor_id=0xbda product_id=0x129 bcd=0x3960 devid=usb\vid_0bda&pid_0129&rev_3960 devinst=6),
USBDevice(vendor_id=0xbda product_id=0x5683 bcd=0x4273 devid=usb\vid_0bda&pid_5683&rev_4273 devinst=7))
No disabled plugins
Looking for devices of type: MTP_DEVICE
List of WPD PNP ids:
['\\\\?\\usb#vid_1949&pid_05e1#g8s1lt062081003t#{6a c27878-a6fa-4155-ba85-f98f491d4f33}']
MTP device: \\?\usb#vid_1949&pid_05e1#g8s1lt062081003t#{6ac278 78-a6fa-4155-ba85-f98f491d4f33}
{'device_version': '1.0',
'friendly_name': '',
'has_bulk_properties': True,
'has_storage': True,
'manufacturer_name': 'Amazon',
'model_name': 'Fire',
'protocol': 'MTP: 1.00',
'serial_number': 'G8S1LT062081003T',
'storage': [{'capacity': 25780625408,
'capacity_objects': 0,
'description': 'Internal storage',
'filesystem': 'Generic hierarchical',
'free_objects': 1073741824,
'free_space': 4118921216,
'id': 's10001',
'name': 'Internal storage',
'rw': True,
'type': 'fixed_ram'}],
'type': 'unknown'}
Trying to open: \\?\usb#vid_1949&pid_05e1#g8s1lt062081003t#{6ac278 78-a6fa-4155-ba85-f98f491d4f33}
Opened Fire successfully
Device info:
{'device_version': '1.0',
'friendly_name': '',
'has_bulk_properties': True,
'has_storage': True,
'manufacturer_name': 'Amazon',
'model_name': 'Fire',
'protocol': 'MTP: 1.00',
'serial_number': 'G8S1LT062081003T',
'storage': [{'capacity': 25780625408,
'capacity_objects': 0,
'description': 'Internal storage',
'filesystem': 'Generic hierarchical',
'free_objects': 1073741824,
'free_space': 4118921216,
'id': 's10001',
'name': 'Internal storage',
'rw': True,
'type': 'fixed_ram'}],
'type': 'unknown'}