My Delstar quit powering on a while after loading their newest firmware. Reset didn't fix it. Finally got it turned on by repeatedly pressing reset while hooked to a pc via USB. Went ahead and loaded the v2.0 firmware for Teclast K5 and now my power issues seem to be solved. It also added support for bookmarking PDF files (yipee!!). The firmware can be obtained here:
ftp://d:d@58.248.4.28:2121/teclast/m...V2.00-A851.rar
I flashed using the tool & instructions from the Delstar site here:
http://delstar.net/ereader-upgrade-instructions
Only issue is once the firmware is installed everything is in Chinese. You have to browse to settings using the icons (unless you read Chinese) and then switch it to English. On the language screen nothing changes after you select English, but all the other menus are switched.
Good luck!!