`usb_modeswitch` returns error -7

I have a GreenTouchPC BT+AC600 Wi-Fi Adapter (info link) that should be an RTL8821CU (0bda:c820) but isn't:

# lsusbBus 002 Device 005: ID 0bda:0158 Realtek Semiconductor Corp. USB 2.0 multicard readerBus 002 Device 009: ID 0bda:1a2b Realtek Semiconductor Corp. RTL8188GU 802.11n WLAN Adapter (Driver CDROM Mode) <-- this oneBus 002 Device 003: ID 5986:0148 Acer, Inc Lenovo EasyCameraBus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching HubBus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubBus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching HubBus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

I have tried using usb_modeswitch on it but it mysteriously fails:

# usb_modeswitch -W -v 0bda -p 1a2b -V 0bda -P c820 -KTake all parameters from the command line * usb_modeswitch: handle USB devices with multiple modes * Version 2.6.1 (C) Josua Dietze 2017 * Based on libusb1/libusbx ! PLEASE REPORT NEW CONFIGURATIONS !DefaultVendor=  0x0bdaDefaultProduct= 0x1a2bTargetVendor=   0x0bdaTargetProduct=  0xc820StandardEject=1Look for target devices ...  found USB ID 0bda:0158   vendor ID matched  found USB ID 0bda:1a2b   vendor ID matched  found USB ID 5986:0148  found USB ID 8087:0020  found USB ID 1d6b:0002  found USB ID 8087:0020  found USB ID 1d6b:0002 No devices in target mode or class foundLook for default devices ...  found USB ID 0bda:0158   vendor ID matched  found USB ID 0bda:1a2b   vendor ID matched   product ID matched  found USB ID 5986:0148  found USB ID 8087:0020  found USB ID 1d6b:0002  found USB ID 8087:0020  found USB ID 1d6b:0002 Found devices in default mode (1)Access device 009 on bus 002Get the current device configuration ...Current configuration number is 1Use interface number 0 with class 8Use endpoints 0x0b (out) and 0x8a (in)USB description data (for identification)-------------------------Manufacturer: Realtek     Product: DISK  Serial No.: not provided-------------------------Sending standard EJECT sequenceLooking for active drivers ...Set up interface 0Use endpoint 0x0b for message sending ...Trying to send message 1 to endpoint 0x0b ... Sending the message returned error -7. Try to continueRead the response to message 1 (CSW) ... Response reading failed (error -7) Device is gone, skip any further commands-> Run lsusb to note any changes. Bye!

Does anyone here know why and are there any solutions? Thank you!