hi,
I got a Tolino Visio which is stuck at the Tolino logo. I can boot intro recovery but I cannot wipe and/or recovery the system, is failing with:

E:failed to verify whole-file signature
E:signature verification failed

I was able to connect to serial port and see the u-boot. I've attached the startup log from u-boot.

Any idea what I can do to restore it from SD card or from u-boot? One idea is to use some Kobo Aura tutorials to try to boot the os from external SD card, but no idea if it will work, and which image to restore on the card, and where to get them.

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Which Tolino?
Tolino Vision 1
I've tired to boot intro fastboot but I am getting unrecognised device under windows. If I put it in download_mode under u-boot, the usb is recognised as Freescale. Any other ideas what to try?
I was able to use fastboot:

1. connect over UART to computer and stop boot sequence by pressing enter until you see:
eBR-1A #
2. type download_mode
this will put the device in download mode and it will be recognised by computer as Freescale i.MX6
3. clone and compile https://github.com/boundarydevices/imx_usb_loader
4. download the correct version of u-boot from tolino website https://opensource.mytolino.com/open_source/tolino-vision/
5. after compilation of imx_usb_loader run:
sudo ./imx_usb u-boot.bin
open another terminal and prepare to send this command and another terminal with UART connection
6. after you send the new u-boot will boot there so prepare to stop the boot process from UART
7. run command fastboot
now you are in fastboot

from this point I was able to load twrp. So I am close to bring my Vision back to life.
After fastboot download the restore image from here. My tolino vision is restore and is works.