Not yet. To tell the truth, I was not aware of this possibility and I had given up. Then I found this thread and davidfor appeared.
I will try it with a new image at the end of this month. And provide a report.
@davidfor
Thank you David.
Edit: success
Following
tshering advice on previous post, I looked the
documentation for the "factory reset" and religiously applied it. To my surprise, my Kobo Glo jumped back to life and after a few hiccups, is now up and running with 3.1.8. version.
I have now two working ebook-readers. As I am waiting for the PW3 jailbreak (5.6.5. version), I will reinstall KSM07 and Koreader. Life goes on...