I do get almost the same machine locally...

I said almost because mine arrive with a slight difference: no speakers, no hold button and no firmware backup file... anyway the machine without any written information in its back looks to me suspiciously similar to a Teclast C260 :shock:
So I get to play with it and I noticed that firmware also has a similar version number to Teclast C260 (mine were 01.07.0000) so I run my fortune installing a Teclast firmware

Now I have a Teclast C260 with the latest version available (01.09.0009 CI) and now I have lots of firmware as backup as my new device is supported by Teclast company and its site an a fansite devoted to Teclast devices (
www.teclasters.com).
I hope you be as lucky as I was and get a RK2608A device capable of run Teclast firmware