Connect Tolino to your computer.
On Tolino, press and hold power button for 10-15 seconds to completely turn off the device (the LED on the power button should go out).
Release Power-Taste.
Now you need to boot into fastboot.
On Tolino, press and hold the backlight button, then press the power button and continue holding both buttons for about 5-6 seconds until the e-reader enters Fastboot mode.
This will also be confirmed by a beep from the computer speakers.
Check fastboot
1_TEST_fastboot.bat
and start TWRP
2_TWRP_boot.bat
The device will boot into TWRP Recovery mode.
See if your PC recognizes the device.
Here's a short video:
https://mega.nz/file/LZEBFIgA#Rf6fHX...5UchnLp4gqEDlg
And since you've opened the device, please let me know whether it has a 4A2 or 4B0 motherboard. There are two types of Vision 2. If a backup doesn't help, I'll prepare a full dump.