Fantom G8 firmware update problem

[awvfx]

Hi everyone,
I recently purchased Fantom G8 and tried updating its firmware (it was 1.30), I downloaded and followed instructions to update using flash drive.
When i updated it to 1.50 i got this error:

"Error Message: Illegal Source"

and then there was no activity on blue screen instead of saying Completed. I gave it good 15 to 20 min and waited but nothing happened, i turned off the keyboard and removed flash drive and restarted the keyboard. It showed in info that it is v1.50 but i am wondering there is no new content like demos and stuff. How do i check that all the 1.50 content has been installed?

Is there a way to re-run the update setup or downgrade it to v1.30 and do the update again?
looking forward for some help from this amazing forum!

Thanks in advance!